CN111913207B - Guiding components and automated systems for assisting in the measurement of radioactive particle activity - Google Patents
Guiding components and automated systems for assisting in the measurement of radioactive particle activity Download PDFInfo
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- CN111913207B CN111913207B CN202010881958.1A CN202010881958A CN111913207B CN 111913207 B CN111913207 B CN 111913207B CN 202010881958 A CN202010881958 A CN 202010881958A CN 111913207 B CN111913207 B CN 111913207B
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- 239000002245 particle Substances 0.000 title claims abstract description 114
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 80
- 238000005259 measurement Methods 0.000 title claims abstract description 57
- 230000000694 effects Effects 0.000 title claims abstract description 38
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000007246 mechanism Effects 0.000 claims description 84
- 210000001503 joint Anatomy 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000010009 beating Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 230000007306 turnover Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000001959 radiotherapy Methods 0.000 description 10
- 206010028980 Neoplasm Diseases 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000002513 implantation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 206010006187 Breast cancer Diseases 0.000 description 1
- 208000026310 Breast neoplasm Diseases 0.000 description 1
- 206010008342 Cervix carcinoma Diseases 0.000 description 1
- 208000002454 Nasopharyngeal Carcinoma Diseases 0.000 description 1
- 206010061306 Nasopharyngeal cancer Diseases 0.000 description 1
- 206010060862 Prostate cancer Diseases 0.000 description 1
- 208000000236 Prostatic Neoplasms Diseases 0.000 description 1
- 208000006105 Uterine Cervical Neoplasms Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 201000010881 cervical cancer Diseases 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000011216 nasopharynx carcinoma Diseases 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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Abstract
The invention relates to a guiding component for assisting activity measurement of radioactive particles and an automatic system, wherein the guiding component comprises a columnar body, a first end face of the columnar body is provided with an inverted cone-shaped groove, and the center position of the inverted cone-shaped groove is provided with a center through hole penetrating through the columnar body so as to guide the movement direction of the radioactive particles; a circular groove taking the central through hole as the center is arranged on the second end surface of the columnar body, and the shape and the size of the circular groove are matched with the particle inlet and outlet end surface of the measuring frame, so that the central through hole of the columnar body is aligned to the measuring tube at the center of the measuring frame when the circular groove is matched with the measuring frame; the circular groove is further provided with a second concentric annular groove, and the shape and the size of the second annular groove are matched with the end face of the cap of the source tank for containing radioactive particles, so that the second annular groove can be matched with the cap. The guiding member and the automated system are beneficial to improving the convenience, accuracy and safety of radioactive particle activity measurement.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a guiding member for assisting radioactive particle activity measurement and an automatic system.
Background
Radiation therapy is one of the three main approaches for tumor treatment at present. With the increasing demands of people on self health and the continuous progress of medical detection means, more and more tumors are discovered early and can be treated to obtain better curative effects. Radiation therapy has an important role in tumor therapy. The curative effect of pure radiotherapy of some tumors such as nasopharyngeal carcinoma, cervical cancer, breast cancer, prostate cancer and the like cannot be replaced by other treatment modes. In the current treatment of tumors, more than 60-70% of patients need radical or adjuvant radiation therapy. The ultimate goal of radiation therapy is to try to increase the gain ratio of radiation therapy, deliver a sufficient dose of radiation to the tumor area, while leaving the surrounding normal tissues and organs as little or free from unnecessary radiation as possible, and avoid other complications arising from radiation therapy.
In the prior art, radiation therapy is largely divided into external irradiation and short-range internal irradiation. The external irradiation technology has been developed rapidly under the development of computer technology, and is widely applied to clinical treatment, but short-distance internal irradiation radiotherapy is also an irreplaceable technology in clinical treatment. The radioactive particle implantation is one of the effective modes of short-range internal irradiation radiotherapy, and the treatment mode has the treatment gain ratio that external irradiation cannot replace. Because the radioactive particles are placed on the tumor part of the patient through the surgical means, the radioactive particles can fully irradiate the tumor area and can well protect normal organs near the tumor. While accurate measurement of particle activity prior to implantation of the particles into the patient is a critical element of the accurate exposure dose of the radiation treatment planning system and the actual patient. The national standard requires that the activity of particles be measured accurately for about 10% of the particles implanted in the patient. In clinical practice, there is a high requirement for protection of staff because of the need to measure a plurality of particles, which are radioactive. The whole set of protective clothing, including lead clothes, lead scarf, lead gloves, lead caps and the like, can produce great inconvenience when corresponding operations are carried out. Without effective personal protection and with a risk to the measurement operator. Therefore, how to improve the convenience, accuracy and safety of particle activity measurement is an urgent problem to be solved at present. The technical problems to be solved mainly relate to two points: firstly, before and after particle measurement, how to make the particles smoothly enter and exit the measuring frame; secondly, how to increase the degree of automation of the whole measurement process. Based on this, the present invention proposes a guiding member and an automated system for assisting the activity measurement of radioactive particles.
Disclosure of Invention
The invention aims to provide a guiding member and an automatic system for assisting radioactive particle activity measurement, which are beneficial to improving the convenience, accuracy and safety of radioactive particle activity measurement.
In order to achieve the above purpose, the invention adopts the following technical scheme: the guiding component comprises a columnar body, wherein an inverted conical groove is formed in the first end face of the columnar body, and a central through hole penetrating through the columnar body is formed in the central position of the inverted conical groove along the height direction of the columnar body so as to guide the movement direction of radioactive particles; a circular groove taking the central through hole as the center is formed in the second end face of the columnar body, and the shape and the size of the circular groove are matched with those of the particle inlet and outlet end face of the measuring frame for measuring the activity of particles, so that the central through hole of the columnar body is aligned to the measuring tube at the center of the measuring frame when the circular groove is matched with the measuring frame; the circular groove is further provided with a second concentric annular groove, and the shape and the size of the second annular groove are matched with the end face of the cap of the source tank for containing radioactive particles, so that when the second annular groove is matched with the cap, the central through hole of the columnar body is opposite to the middle of the cap.
Further, the columnar body is a cylinder.
Further, the shape and size of the central through hole are adapted to the radioactive particles so that they can pass right through the central through hole.
Further, the first end face of the columnar body is provided with a first annular groove concentric with the inverted conical groove at the periphery of the inverted conical groove, and the shape and the size of the first annular groove are matched with the particle inlet and outlet end face of the measuring frame, so that the first annular groove can be matched with the measuring frame.
Further, the method for assisting in measuring the activity of the particles by adopting the guide member comprises the following steps:
1) Before the measurement starts, firstly placing a measuring frame into a well-type ionization chamber, then placing a guide member on the measuring frame, and tightly matching a circular groove on a second end face downwards with the measuring frame, wherein a central through hole of the columnar body is right opposite to a measuring tube at the center of the measuring frame;
2) Placing the source tank on a guide member, opening a cap of the source tank provided with radioactive particles, and then beating out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube at the center of the measuring frame under the guidance of an inverted cone-shaped groove and a center through hole; then the cap is tightly screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted;
3) Measuring radioactive particles by using a measuring device of a well-type ionization chamber;
4) After the measurement is completed, separating the guide member from the measurement frame, inverting the guide member, and tightly fitting the first annular groove on the first end face downwards with the measurement frame; taking another set of empty source tank and cap, and tightly matching the cap with a second annular groove on the second end surface at the upper side;
5) The measuring frame, the guiding component and the cap are integrally moved upwards out of the well-type ionization chamber, and then the whole body is turned over for 180 degrees, at the moment, radioactive particles leave the measuring tube and naturally fall into the cap under the guidance of the inverted cone-shaped groove and the central through hole;
6) The measuring frame, the guiding member and the cap are separated from each other, the empty source tank and the cap are in butt joint and screwed, the radioactive particles are recovered, and the measuring frame is placed back into the well-type ionization chamber to wait for the next measurement.
The invention also provides an automatic system for assisting the activity measurement of the radioactive particles, which comprises a base, a rotating bracket, a measuring frame, a guide member and a source tank mounting frame, wherein the base is provided with a third telescopic mechanism; the measuring frame is arranged on the rotating bracket; the guide member is positioned on the upper side of the measuring frame, the rotating bracket is provided with a first telescopic mechanism, and the guide member is rotationally connected with the moving end of the first telescopic mechanism and is driven to rotate by a first motor fixedly arranged on the moving end of the first telescopic mechanism, so that the guide member can move up and down and rotate; the source tank mounting frame is positioned on the upper side of the guide member, a second telescopic mechanism is further arranged on the rotating support, and the source tank mounting frame is fixedly connected with the moving end of the second telescopic mechanism so that the source tank mounting frame can move up and down;
The guiding component comprises a columnar body, a first end face of the columnar body is provided with an inverted cone-shaped groove, and a central through hole penetrating through the columnar body is formed in the central position of the inverted cone-shaped groove along the height direction of the columnar body so as to guide the movement direction of the radioactive particles; a circular groove taking the central through hole as the center is formed in the second end face of the columnar body, and the shape and the size of the circular groove are matched with those of the particle inlet and outlet end face of the measuring frame for measuring the activity of particles, so that the central through hole of the columnar body is aligned to the measuring tube at the center of the measuring frame when the circular groove is matched with the measuring frame; the circular groove is further provided with a second annular groove concentric with the circular groove, and the shape and the size of the second annular groove are matched with the end face of the cap of the source tank for containing radioactive particles, so that when the second annular groove is matched with the cap, the central through hole of the columnar body is right opposite to the middle part of the cap; the first end face of the columnar body is provided with a first annular groove concentric with the inverted conical groove at the periphery of the inverted conical groove, and the shape and the size of the first annular groove are matched with the particle inlet and outlet end face of the measuring frame so that the first annular groove can be matched with the measuring frame;
the lower end of the source tank mounting frame is provided with a cap mounting groove with a shape and a size which are matched with those of the cap so as to be connected with the cap in a matched manner.
Further, a left third telescopic mechanism and a right third telescopic mechanism are arranged on the base, a bearing seat is arranged at the moving end of the third telescopic mechanism, and the left end and the right end of the rotating bracket are rotationally connected with the bearing seat at the moving end of the third telescopic mechanism through rotating shafts; the left end and the right end of the guide member are rotatably connected with the bearing seats on the moving ends of the first telescopic mechanisms through rotating shafts; the left end and the right end of the source tank mounting frame are fixedly connected with the moving ends of the second telescopic mechanisms respectively.
Further, the first telescopic mechanism, the second telescopic mechanism and the third telescopic mechanism are all electric push rods.
Further, a control device is arranged on the automation system and is electrically connected with the control ends of the first motor, the third motor, the first telescopic mechanism, the second telescopic mechanism and the third telescopic mechanism respectively so as to control the motors and the mechanisms to work.
Further, the method for measuring the particle activity assisted by the automatic system comprises the following steps:
S1) before measurement starts, placing an automatic system on a well-type ionization chamber; the whole rotating bracket is driven to move downwards through the third telescopic mechanism, so that the measuring bracket enters the well-type ionization chamber; taking a set of empty source tank and a cap, and mounting the cap on a cap mounting groove at the lower end of a source tank mounting frame;
S2) driving the guide member to move downwards through the first telescopic mechanism, so that a circular groove on the second end surface of the guide member is matched with the measuring frame downwards;
S3) opening a cover cap of the source tank provided with the radioactive particles, placing the source tank on a guide member, and then beating out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube at the center of the measuring frame under the guidance of the inverted cone-shaped groove and the center through hole; then the cap is tightly screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted;
S4) measuring radioactive particles by adopting a measuring device of a well-type ionization chamber;
s5) after the measurement is completed, driving the guide member to move upwards through the first telescopic mechanism so as to be separated from the measurement frame; driving the guide member to turn 180 degrees by the first motor, wherein the second end face of the guide member faces upwards;
S6) driving the guide member to move downwards through the first telescopic mechanism, so that a first annular groove on the first end surface of the guide member is matched with the measuring frame downwards; the source tank mounting frame is driven to move downwards through the second telescopic mechanism, so that the cap is tightly matched with a second annular groove on the second end surface of the guide member;
S7) driving the whole rotating support to move upwards through a third telescopic mechanism, enabling the measuring frame, the guide member and the cap to move out of the well-type ionization chamber upwards, driving the rotating support to turn over 180 degrees through a third motor, enabling radioactive particles to leave the measuring tube at the moment, and naturally falling into the cap under the guidance of the inverted cone-shaped groove and the central through hole;
S8) driving the measuring frame, the guide member and the source tank mounting frame to be separated from each other through the first telescopic mechanism and the second telescopic mechanism, taking down the cap and butting and screwing the cap with the matched empty source tank to finish radioactive particle recovery, resetting the automatic system and waiting for the next measurement.
Compared with the prior art, the invention has the following beneficial effects: the guiding member is designed by an adaptive structure such as a measuring frame and a source tank cover cap, so that radioactive particles can conveniently, quickly and accurately enter the measuring frame before being measured, and can smoothly leave the measuring frame and return to the source tank cover cap after being measured. In addition, the automation system can also improve the automation degree of particle activity measurement, greatly reduce the operation time of staff, thereby greatly reducing the harm of a radioactive source to the staff and improving the safety of particle activity measurement. Therefore, the invention has strong practicability and wide application prospect.
Drawings
Fig. 1 is a structural cross-sectional view of a guide member of an embodiment of the present invention.
FIG. 2 is a schematic flow chart of the guiding member for assisting in measuring the activity of particles in the embodiment of the invention.
Fig. 3 is a schematic structural view of an automation system according to an embodiment of the present invention.
FIG. 4 is a schematic flow chart of an automated system for assisting in measuring particle activity in an embodiment of the invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
The invention provides a guiding component for assisting activity measurement of radioactive particles, as shown in fig. 1, comprising a columnar body 101, wherein an inverted conical groove 102 is arranged on a first end surface of the columnar body, and a central through hole 103 penetrating through the columnar body is formed in the central position of the inverted conical groove 102 along the height direction of the columnar body so as to guide the movement direction of the radioactive particles; a circular groove 104 taking the central through hole as the center is arranged on the second end surface of the columnar body 101, the shape and the size of the circular groove 104 are matched with those of the particle inlet and outlet end surface of the measuring frame for measuring the activity of particles, so that when the circular groove 104 is matched with the measuring frame, the central through hole 103 of the columnar body is opposite to the measuring tube at the center of the measuring frame; the circular groove 104 is further provided with a second annular groove 105 concentric with the circular groove, the shape and the size of the second annular groove 105 are matched with the end face of the cap of the source tank for containing radioactive particles, so that when the second annular groove 105 is matched with the cap, the central through hole 103 of the columnar body is opposite to the middle part of the cap; the first end surface of the columnar body 101 is provided with a first annular groove 106 concentric with the inverted conical groove 102 at the periphery of the inverted conical groove, and the shape and the size of the first annular groove 106 are adapted to the particle inlet and outlet end surfaces of the measuring frame, so that the first annular groove 106 can be matched with the measuring frame.
Wherein the shape and size of the central through hole 103 is adapted to the radioactive particles so that they can pass right through the central through hole. In this embodiment, the columnar body is a cylinder.
As shown in fig. 2, the method for assisting in measuring the activity of particles by using the guide member comprises the following steps:
1) Before the measurement starts, the measurement frame is placed in the well-type ionization chamber, then the guide member is placed on the measurement frame as shown in fig. 2 (a), and the circular groove on the second end face is tightly fitted downward with the measurement frame, and the center through hole of the columnar body is aligned with the measurement pipe at the center of the measurement frame as shown in fig. 2 (b).
2) Placing the source tank on a guide member, opening a cap of the source tank provided with the radioactive particles, as shown in fig. 2 (c), driving a source needle into a source outlet hole on the source tank, and punching out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube in the center of the measuring frame under the guidance of an inverted cone-shaped groove and a center through hole; the cap is then screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted. The measurement is typically performed with a new source canister, so that after a particle is knocked out, there are other particles inside, and the source canister and its cap should remain in one set, since the set of equipment is already sterilized, and further needs to be used for subsequent patient treatment.
3) The radioactive particles are measured using a measuring device of a well-type ionization chamber.
4) After the measurement is completed, the guide member is separated from the measurement frame, and then the guide member is inverted, as shown in fig. 2 (d); tightly matching the first annular groove on the first end face downwards with the measuring frame; another set of the empty source tank and the cap is taken, and the cap is tightly matched with a second annular groove on the second end surface at the upper side, as shown in fig. 2 (e).
5) The measuring rack, the guide member and the cap are moved out of the well-type ionization chamber in its entirety, and then turned over 180 ° in its entirety, as shown in fig. 2 (f), at which time the radioactive particles leave the measuring tube and fall naturally into the cap under the guidance of the inverted cone-shaped groove and the central through hole.
6) The measuring rack, the guide member and the cap are separated from each other, as shown in fig. 2 (g), the empty source tank and the cap are butt-screwed to complete the recovery of the radioactive particles, and the measuring rack is put back into the well-type ionization chamber to wait for the next measurement.
The invention also provides an automatic system for assisting the activity measurement of radioactive particles, as shown in fig. 3, comprising a base 201, a rotating bracket 202, a measuring frame 203, a guiding member 204 and a source tank mounting frame 205, wherein a third telescopic mechanism 210 is arranged on the base 201, the rotating bracket 202 is rotationally connected with the moving end of the third telescopic mechanism 210 and is driven to rotate by a third motor 206 fixedly arranged on the moving end of the third telescopic mechanism 210, so that the rotating bracket can move up and down and rotate; the measuring frame 203 is mounted on the rotating bracket 202; the guiding member 204 is located at the upper side of the measuring frame 203, the rotating bracket 202 is provided with a first telescopic mechanism 207, the guiding member 204 is rotationally connected with the moving end of the first telescopic mechanism 207 and is driven to rotate by a first motor 208 fixedly installed on the moving end of the first telescopic mechanism 207, so that the guiding member can move up and down and rotate; the source tank mounting frame 205 is located on the upper side of the guide member 204, and the second telescopic mechanism 209 is further installed on the rotating bracket 202, and the source tank mounting frame 205 is fixedly connected with the moving end of the second telescopic mechanism 209, so that the source tank mounting frame can move up and down.
The structure of the guide member has been described in detail above. The lower end of the source tank mounting frame is provided with a cap mounting groove with a shape and a size which are matched with those of the cap so as to be connected with the cap in a matched manner.
In this embodiment, the base is provided with left and right third telescopic mechanisms, the moving end of the third telescopic mechanism is provided with a bearing seat, and the left and right ends of the rotating bracket are rotationally connected with the bearing seat on the moving end of the third telescopic mechanism through a rotating shaft; the left end and the right end of the guide member are rotatably connected with the bearing seats on the moving ends of the first telescopic mechanisms through rotating shafts; the left end and the right end of the source tank mounting frame are fixedly connected with the moving ends of the second telescopic mechanisms respectively. The first telescopic mechanism, the second telescopic mechanism and the third telescopic mechanism are all electric push rods.
In order to realize automatic control so as to improve the automation degree of the system, a control device is arranged on the automatic system and is respectively and electrically connected with control ends of the first motor, the third motor, the first telescopic mechanism, the second telescopic mechanism and the third telescopic mechanism so as to control the motors and the mechanisms to work.
As shown in fig. 4, the method for assisting in measuring the activity of the particles by adopting the automatic system comprises the following steps:
S1) before the measurement starts, the automated system is placed onto the well ionization chamber 212; the whole rotating bracket is driven to move downwards through the third telescopic mechanism, so that the measuring bracket enters the well-type ionization chamber; a set of empty source tank and cap is taken, and the cap is installed on a cap installation groove at the lower end of the source tank installation frame, as shown in fig. 4 (a).
S2) driving the guide member to move downwards through the first telescopic mechanism, so that the circular groove on the second end surface of the guide member is matched with the measuring frame downwards in a tight mode, as shown in fig. 4 (b).
S3) opening a cap of the source tank provided with the radioactive particles, placing the source tank on the guide member, and then beating out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube 211 in the center of the measuring frame under the guidance of the inverted cone-shaped groove and the center through hole; the cap is then screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted.
S4) measuring the radioactive particles by using a measuring device of the well-type ionization chamber.
S5) after the measurement is completed, driving the guide member to move upwards through the first telescopic mechanism so as to be separated from the measurement frame, as shown in fig. 4 (c); the guide member is turned 180 ° by the first motor drive with the second end face of the guide member facing upward as shown in fig. 4 (d).
S6) driving the guide member to move downwards through the first telescopic mechanism, so that a first annular groove on the first end surface of the guide member is matched with the measuring frame downwards; the source canister mount is driven downward by the second telescopic mechanism to mate the cap with the second annular recess on the second end face of the guide member, as shown in fig. 4 (e).
S7) driving the whole rotating support to move upwards through the third telescopic mechanism, enabling the measuring frame, the guide member and the cap to move out of the well-type ionization chamber upwards, and then driving the rotating support to turn over 180 degrees through the third motor, wherein radioactive particles leave the measuring tube and naturally fall into the cap under the guidance of the inverted cone-shaped groove and the central through hole, as shown in fig. 4 (f).
S8) driving the measuring frame, the guide member and the source tank mounting frame to be separated from each other through the first telescopic mechanism and the second telescopic mechanism, taking down the cap and butting and screwing the cap with the matched empty source tank, and completing radioactive particle recovery, resetting the automatic system and waiting for the next measurement as shown in fig. 4 (g).
The above is a preferred embodiment of the present invention, and all changes made according to the technical solution of the present invention belong to the protection scope of the present invention when the generated functional effects do not exceed the scope of the technical solution of the present invention.
Claims (7)
1. The guiding member for assisting the activity measurement of the radioactive particles is characterized by comprising a columnar body, wherein an inverted cone-shaped groove is formed in the first end face of the columnar body, and a central through hole penetrating through the columnar body is formed in the central position of the inverted cone-shaped groove along the height direction of the columnar body so as to guide the movement direction of the radioactive particles; a circular groove taking the central through hole as the center is formed in the second end face of the columnar body, and the shape and the size of the circular groove are matched with those of the particle inlet and outlet end face of the measuring frame for measuring the activity of particles, so that the central through hole of the columnar body is aligned to the measuring tube at the center of the measuring frame when the circular groove is matched with the measuring frame; the circular groove is further provided with a second annular groove concentric with the circular groove, and the shape and the size of the second annular groove are matched with the end face of the cap of the source tank for containing radioactive particles, so that when the second annular groove is matched with the cap, the central through hole of the columnar body is right opposite to the middle part of the cap;
The method for assisting in measuring the activity of the particles by adopting the guide member comprises the following steps:
1) Before the measurement starts, firstly placing a measuring frame into a well-type ionization chamber, then placing a guide member on the measuring frame, and tightly matching a circular groove on a second end face downwards with the measuring frame, wherein a central through hole of the columnar body is right opposite to a measuring tube at the center of the measuring frame;
2) Placing the source tank on a guide member, opening a cap of the source tank provided with radioactive particles, and then beating out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube at the center of the measuring frame under the guidance of an inverted cone-shaped groove and a center through hole; then the cap is tightly screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted;
3) Measuring radioactive particles by using a measuring device of a well-type ionization chamber;
4) After the measurement is completed, separating the guide member from the measurement frame, inverting the guide member, and tightly fitting the first annular groove on the first end face downwards with the measurement frame; taking another set of empty source tank and cap, and tightly matching the cap with a second annular groove on the second end surface at the upper side;
5) The measuring frame, the guiding component and the cap are integrally moved upwards out of the well-type ionization chamber, and then the whole body is turned over for 180 degrees, at the moment, radioactive particles leave the measuring tube and naturally fall into the cap under the guidance of the inverted cone-shaped groove and the central through hole;
6) The measuring frame, the guiding member and the cap are separated from each other, the empty source tank and the cap are in butt joint and screwed, the radioactive particles are recovered, and the measuring frame is placed back into the well-type ionization chamber to wait for the next measurement.
2. The guide member for assisting activity measurement of radioactive particles according to claim 1, wherein the columnar body is a cylinder.
3. The guide member for assisting activity measurement of radioactive particles according to claim 1, wherein the shape and size of the central through hole is adapted to the radioactive particles so that they can pass right through the central through hole.
4. A guide member for assisting activity measurement of radioactive particles according to claim 1,2 or 3, wherein the first end face of the cylindrical body is provided with a first annular groove concentric therewith at the outer periphery of the inverted conical groove, the first annular groove being shaped and dimensioned to fit the particle in and out end face of the measuring rack so that the first annular groove can fit the measuring rack.
5. An automatic system for assisting radioactive particle activity measurement is characterized by comprising a base, a rotating support, a measuring frame, a guide member and a source tank mounting frame, wherein a third telescopic mechanism is arranged on the base, the rotating support is rotationally connected with a moving end of the third telescopic mechanism and is driven to rotate by a third motor fixedly arranged on the moving end of the third telescopic mechanism, so that the rotating support can move up and down and rotate; the measuring frame is arranged on the rotating bracket; the guide member is positioned on the upper side of the measuring frame, the rotating bracket is provided with a first telescopic mechanism, and the guide member is rotationally connected with the moving end of the first telescopic mechanism and is driven to rotate by a first motor fixedly arranged on the moving end of the first telescopic mechanism, so that the guide member can move up and down and rotate; the source tank mounting frame is positioned on the upper side of the guide member, a second telescopic mechanism is further arranged on the rotating support, and the source tank mounting frame is fixedly connected with the moving end of the second telescopic mechanism so that the source tank mounting frame can move up and down;
The guiding component comprises a columnar body, a first end face of the columnar body is provided with an inverted cone-shaped groove, and a central through hole penetrating through the columnar body is formed in the central position of the inverted cone-shaped groove along the height direction of the columnar body so as to guide the movement direction of the radioactive particles; a circular groove taking the central through hole as the center is formed in the second end face of the columnar body, and the shape and the size of the circular groove are matched with those of the particle inlet and outlet end face of the measuring frame for measuring the activity of particles, so that the central through hole of the columnar body is aligned to the measuring tube at the center of the measuring frame when the circular groove is matched with the measuring frame; the circular groove is further provided with a second annular groove concentric with the circular groove, and the shape and the size of the second annular groove are matched with the end face of the cap of the source tank for containing radioactive particles, so that when the second annular groove is matched with the cap, the central through hole of the columnar body is right opposite to the middle part of the cap; the first end face of the columnar body is provided with a first annular groove concentric with the inverted conical groove at the periphery of the inverted conical groove, and the shape and the size of the first annular groove are matched with the particle inlet and outlet end face of the measuring frame so that the first annular groove can be matched with the measuring frame;
the lower end of the source tank mounting frame is provided with a cap mounting groove with a shape and a size which are matched with those of the cap so as to be connected with the cap in a matching way;
The base is provided with a left third telescopic mechanism and a right third telescopic mechanism, the moving end of the third telescopic mechanism is provided with a bearing seat, and the left end and the right end of the rotating bracket are rotationally connected with the bearing seat on the moving end of the third telescopic mechanism through a rotating shaft; the left end and the right end of the guide member are rotatably connected with the bearing seats on the moving ends of the first telescopic mechanisms through rotating shafts; the left end and the right end of the source tank mounting frame are fixedly connected with the moving ends of the second telescopic mechanisms respectively;
the first telescopic mechanism, the second telescopic mechanism and the third telescopic mechanism are all electric push rods.
6. The automated system of claim 5, wherein a control device is disposed on the automated system and is electrically connected to the control ends of the first motor, the third motor, the first telescoping mechanism, the second telescoping mechanism, and the third telescoping mechanism, respectively, to control the operation of the motors and mechanisms.
7. The automated system for assisting radioactive particle activity measurement of claim 5 or 6, wherein the method of assisting measurement of particle activity with the automated system is:
S1) before measurement starts, placing an automatic system on a well-type ionization chamber; the whole rotating bracket is driven to move downwards through the third telescopic mechanism, so that the measuring bracket enters the well-type ionization chamber; taking a set of empty source tank and a cap, and mounting the cap on a cap mounting groove at the lower end of a source tank mounting frame;
S2) driving the guide member to move downwards through the first telescopic mechanism, so that a circular groove on the second end surface of the guide member is matched with the measuring frame downwards;
S3) opening a cover cap of the source tank provided with the radioactive particles, placing the source tank on a guide member, and then beating out the radioactive particles, wherein the radioactive particles naturally fall into a measuring tube at the center of the measuring frame under the guidance of the inverted cone-shaped groove and the center through hole; then the cap is tightly screwed in a butt joint manner, and the source tank filled with the residual radioactive particles is retracted;
S4) measuring radioactive particles by adopting a measuring device of a well-type ionization chamber;
s5) after the measurement is completed, driving the guide member to move upwards through the first telescopic mechanism so as to be separated from the measurement frame; driving the guide member to turn 180 degrees by the first motor, wherein the second end face of the guide member faces upwards;
S6) driving the guide member to move downwards through the first telescopic mechanism, so that a first annular groove on the first end surface of the guide member is matched with the measuring frame downwards; the source tank mounting frame is driven to move downwards through the second telescopic mechanism, so that the cap is tightly matched with a second annular groove on the second end surface of the guide member;
S7) driving the whole rotating support to move upwards through a third telescopic mechanism, enabling the measuring frame, the guide member and the cap to move out of the well-type ionization chamber upwards, driving the rotating support to turn over 180 degrees through a third motor, enabling radioactive particles to leave the measuring tube at the moment, and naturally falling into the cap under the guidance of the inverted cone-shaped groove and the central through hole;
S8) driving the measuring frame, the guide member and the source tank mounting frame to be separated from each other through the first telescopic mechanism and the second telescopic mechanism, taking down the cap and butting and screwing the cap with the matched empty source tank to finish radioactive particle recovery, resetting the automatic system and waiting for the next measurement.
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| US4820925A (en) * | 1987-03-23 | 1989-04-11 | The United States Of America As Represented By The United States Department Of Energy | Room air monitor for radioactive aerosols |
| US5128539A (en) * | 1990-08-15 | 1992-07-07 | The United States Of America As Represented By The United States Department Of Energy | Apparatus having reduced background for measuring radiation activity in aerosol particles |
| ATE538377T1 (en) * | 2007-04-02 | 2012-01-15 | Acoustic Cytometry Systems Inc | METHOD FOR IMPROVED ANALYSIS OF CELLS AND PARTICLES FOCUSED IN AN ACOUSTIC FIELD |
| CN108761515B (en) * | 2018-06-06 | 2022-02-18 | 成都理工大学 | An online aerosol detector |
| CN109752752B (en) * | 2018-12-10 | 2023-06-16 | 兰州空间技术物理研究所 | A detector suitable for compound detection of space particles |
| CN209992684U (en) * | 2019-05-24 | 2020-01-24 | 中国医学科学院放射医学研究所 | A kind of grain seed source activity measurement support |
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