CN110764131A - A size-variable gamma-ray detection collimator and collimation detection system - Google Patents

Abstract

The invention discloses a size-variable gamma-ray detection collimator and a collimation detection system which can realize the adjustment of the size of the through hole of the detector collimator so as to be suitable for detecting different ray intensities. The size-variable gamma-ray detection collimator includes a bracket, a fixed slider, a top horizontal slider, a vertical slider, and a bottom horizontal slider. The gamma ray collimation detection system includes a gamma ray detection collimator with variable size; it also includes a base; a vertical slide plate is arranged on one side of the base; a lift platform is arranged on the base; A mounting plate is slidably installed on the lifting platform; the mounting plate is mounted on the lifting platform through a lateral linear drive device; the gamma-ray detection collimator with variable size is arranged on the mounting plate. The use of the gamma-ray detection collimator and the collimation detection system with variable size is convenient to adapt to the detection of different layers of nuclear waste barrels, and can improve the compatibility of the detection system for nuclear wastes with different activities.

Description

A size-variable gamma-ray detection collimator and collimation detection system

technical field

The invention relates to the field of radioactive ray collimation detection in the nondestructive detection of nuclear waste, in particular to a gamma ray detection collimator with variable size and a collimation detection system.

Background technique

As we all know: low and intermediate level nuclear waste is usually stored in standard barrels, and the nuclear waste in barrels must undergo qualitative and quantitative measurement of radioactivity during transportation, storage, and delivery, so as to be stored in categories. The non-destructive testing and analysis methods of segmental gamma scanning and tomographic gamma scanning are usually used. Both detection methods require layered measurement of nuclear waste barrels. Therefore, in the gamma scanning process, in order to reduce the crosstalk effect of radioactivity entering the detector between each layer, and at the same time reduce the degree of divergence of the transmission source gamma rays entering the detector, Gamma-ray detectors need to be collimated. In addition, the size of the collimator needs to be optimized depending on the selection/setting of the number of layers, and the collimator needs to be optimized. The dead time of the detector is within a reasonable range. The existing collimation detection system has a certain size of the detector collimator hole, so it can only be applied to the corresponding ray intensity and number of layers; it cannot be generalized and optimized, and the scope of application is small. The present invention proposes a gamma-ray detection collimator and a detection system with a fully automatic control of variable size, which can control the opening size of the collimator according to the setting of the number of layers and the activity of nuclear waste, so as to improve the accuracy of the detection system. The compatibility of nuclear wastes with different activities reduces the influence of crosstalk in the layered scanning detection of nuclear wastes and expands the use range of the system.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a gamma ray detection collimator and a collimation detection system with variable size which can realize the adjustment of the size of the through hole of the detector collimator so as to be suitable for detecting different ray intensities.

The technical solution adopted by the present invention to solve the technical problem is as follows: a size-variable gamma-ray detection collimator, comprising a bracket, a fixed slider, a top horizontal slider, a vertical slider, and a bottom horizontal slider;

The top horizontal slider is installed horizontally, the fixed slider is installed vertically, one end of the fixed slider is installed below one end of the top horizontal slider, the bottom horizontal slider is installed horizontally, and the bottom horizontal slider is installed horizontally. is located below the top horizontal slider, and one end of the bottom horizontal slider is located on one side of the lower end of the fixed slider;

The vertical sliding block is installed vertically, and one end of the vertical sliding block is located above one end of the bottom horizontal sliding block; one end of the top horizontal sliding block is located on one side of the upper end of the vertical sliding block;

The fixed slider is fixedly installed on the bracket; the top horizontal slider is installed on the bracket through a horizontal linear drive device; the bottom horizontal slider is installed on the bracket through a vertical linear drive device; the vertical slider The bidirectional moving device is driven by vertical sliding horizontally and linearly, and the two-way moving device is installed on the bracket; the vertical sliding block is driven by the vertical sliding horizontally driving the bidirectional moving device, so as to realize horizontal movement and vertical linear follow-up.

Further, the fixed slider, the top horizontal slider, the vertical slider, and the bottom horizontal slider are all made of lead.

Further, the horizontal linear drive device and the vertical linear drive device both use a screw slide table.

Further, the vertical sliding horizontal linear driving bidirectional moving device includes a horizontal linear driving screw slide table and a vertical linear driving screw sliding table.

The invention also provides a gamma ray collimation detection system, comprising a gamma ray detection collimator with variable size;

It also includes a base; a vertical slide plate is arranged on one side of the base; a lifting platform is arranged on the base; a mounting plate is slidably installed on the lifting platform; on the lifting platform;

The size-variable gamma-ray detection collimator is arranged on the mounting plate; the bracket is fixedly mounted on the mounting plate;

A detector is provided on one side of the gamma-ray detection collimator with variable size; the detector is installed on an adjustment device that can move vertically and horizontally.

Further, the adjustment device includes an adjustment bracket; the adjustment bracket is provided with a sliding seat installed vertically; the sliding seat is installed on the adjustment bracket through a vertical linear drive adjustment device;

The sliding seat is provided with an adjustment plate; the adjustment plate is installed on the sliding seat through a longitudinal linear drive adjustment device.

Further, the vertical linear drive adjustment device and the longitudinal linear drive adjustment device all use a lead screw slider device.

Further, the lateral linear drive device adopts a screw-slider device.

The beneficial effects of the present invention are: the variable-size gamma-ray detection collimator of the present invention includes a fixed slider, a top horizontal slider, a vertical slider, and a bottom horizontal slider, and the fixed slider is activated to fix the , other sliders can be moved, so that the size of the area enclosed by the four sliders can be changed, so as to realize the adjustment of the size of the through hole of the detector collimator, so as to facilitate the detection of different radioactive ray intensities and adapt to different The detection of the number of layers of nuclear waste barrels can improve the compatibility of the detection system for nuclear wastes with different activities, reduce the influence of crosstalk in the detection of nuclear waste layered scanning, and expand the scope of use of the system.

The γ-ray collimation detection system of the present invention can automatically adjust the probe position to keep its center concentric with the center of the end face opening of the collimation detector while changing the size of the through hole of the detector collimator by setting parameters, and then simulate Various experimental opening conditions are used to detect radioactive sources through the intermediate cylindrical object under the condition of detecting end faces of different sizes, and then study the characteristics of radioactivity.

The L-shaped support platform of the collimation detector assembly realizes the precise movement and positioning of the collimation detector module up and down under the operation of the automatic control platform, ensuring that the center of the probe and the center of the radiation source are on the same center line, and the movement accuracy is controlled within ±0.05 mm; the whole movement process is smooth and stable.

Description of drawings

1 is a perspective view of a γ-ray collimation detection system in an embodiment of the present invention;

2 is a perspective view of the γ-ray collimation detection system in the embodiment of the present invention with the support removed;

3 is a side view of a gamma ray collimation detection system in an embodiment of the present invention;

4 is a front view of the γ-ray collimation detection system in the embodiment of the present invention with the support removed;

5 is a schematic diagram of the layout of a slider in an embodiment of the present invention;

6 is a perspective view of a gamma-ray detection collimator with variable dimensions in an embodiment of the present invention;

7 is a perspective view of an adjustment bracket in an embodiment of the present invention;

FIG. 8 is a front view of the adjusting bracket in the embodiment of the present invention;

Indicated in the picture: 1- base, 2- lift platform, 3- gamma ray detection collimator, 4- mounting plate, 5- vertical slide plate, 6- bracket, 7- slide rail, 8- detector, 9- adjustment device, 10-buffering device, 11-limiting block.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 to FIG. 8 , a size-variable gamma-ray detection collimator according to the present invention includes a bracket 6 , a fixed slider 31 , a top horizontal slider 32 , a vertical slider 33 , and a bottom horizontal slider 32 . slider 34;

The top horizontal slider 32 is installed horizontally, the fixed slider 31 is installed vertically, one end of the fixed slider 31 is installed below one end of the top horizontal slider 32, and the bottom horizontal slider 34 is installed horizontally, so The bottom horizontal slider 34 is located below the top horizontal slider 32, and one end of the bottom horizontal slider 34 is located on the side of the lower end of the fixed slider 31;

The vertical sliding block 33 is installed vertically, and one end of the vertical sliding block 33 is located above one end of the bottom horizontal sliding block 34; one end of the top horizontal sliding block 32 is located on the side of the upper end of the vertical sliding block 33;

The fixed slider 31 is fixedly installed on the bracket 6; the top horizontal slider 32 is installed on the bracket 6 through a horizontal linear drive device 32; the bottom horizontal slider 34 is installed on the bracket 6 through a vertical linear drive device 37 The vertical sliding block 33 is installed on the bracket 6 by vertically sliding the horizontal linear driving bidirectional moving device 36; Vertical linear follow-up.

During the working process, the detector 8 is placed in the center of the area enclosed by the fixed slider 31, the top horizontal slider 32, the vertical slider 33 and the bottom horizontal slider 34; The horizontal slider 32 slides horizontally, and the bottom horizontal slider 34 can be moved up and down through the vertical linear drive device 37, while the vertical slider 33 can be moved horizontally and vertically through the vertical sliding horizontal linear drive bidirectional moving device 36. Follow; thereby adjusting the size of the area enclosed by the fixed slider 31 , the top horizontal slider 32 , the vertical slider 33 and the bottom horizontal slider 34 , thereby realizing the detection of different rays.

Specifically, the fixed slider 31, the top horizontal slider 32, the vertical slider 33, and the bottom horizontal slider 34 are all made of lead. The horizontal linear drive device 32 and the vertical linear drive device 37 both use screw slides. The vertical sliding horizontal linear driving bidirectional moving device 36 includes a horizontal linear driving screw slide table and a vertical linear driving screw sliding table.

Among them, the collimation detector is one of the core modules of the collimation detection system. The device can realize the size change of the through hole on the collimation end face of the detector by setting parameters, that is, the horizontal linear drive device 35 can make the top horizontal slider 32 level. Sliding, the bottom horizontal slider 34 can be moved up and down through the vertical linear drive device 37, and the vertical slider 33 can be moved horizontally and the vertical linear follow-up can be realized by the vertical sliding horizontal linear drive bidirectional moving device 36; The size of the area enclosed by the fixed slider 31 , the top horizontal slider 32 , the vertical slider 33 and the bottom horizontal slider 34 . Furthermore, in the case of detecting end faces of different sizes, the nuclear radiation source can be detected through the intermediate cylindrical object, and then the characteristics of the radiation source can be studied.

The detector consists of two end face opening modes, consisting of a fixed slider 31, a top horizontal slider 32, a vertical slider 33, and a bottom horizontal slider 34. The fixed slider 31 is fixed, and the remaining three sliders are passed through. To realize the transformation of any opening, each slider is controlled by a high-precision screw slide. According to the material of the slider, the bearing capacity of the high-precision slide is different. Precision ball screws, ball nuts, titanium-aluminum alloy slides, stainless steel connectors and power distribution cables are the main products. Among them, the top horizontal slider 32 and the bottom horizontal slider 34 are reciprocated in a single axis direction by a single precision ball screw slide table, and the vertical slider 33 can realize reciprocating motion in two coordinate axes. The slider approximates the gap between the contact parts. 0.05mm is required to ensure that the detector tower head does not "scatter and drift", and create a scientific and reasonable collimation opening for the probe to detect radioactive sources. The mechanism has the function of arbitrary quadrilateral transformation, its detection ability is wide, and its application is good.

The present invention also provides a gamma ray collimation detection system, comprising a gamma ray detection collimator 3 with variable size;

It also includes a base 1; a vertical sliding plate 5 is arranged on one side of the base 1; a lifting platform 2 is arranged on the base 1; a mounting plate 3 is slidably installed on the lifting platform 2; the mounting plate 3 Installed on the lifting platform 2 through the lateral linear drive device;

The size-variable gamma-ray detection collimator 3 is arranged on the mounting plate 3; the bracket 6 is fixedly mounted on the mounting plate 13;

A detector 8 is disposed on one side of the gamma-ray detection collimator 3 with variable dimensions; the detector 8 is installed on an adjustment device 9 that can move vertically and horizontally.

Specifically, the adjustment device 9 includes an adjustment bracket 91; the adjustment bracket 91 is provided with a sliding seat 92 that is vertically slidably installed; the sliding seat 92 is installed on the adjustment bracket 91 through a vertical linear drive adjustment device;

The sliding seat 92 is provided with an adjustment plate 93 ; the adjustment plate 93 is installed on the sliding seat 92 by a longitudinal linear driving adjustment device 94 . The vertical linear drive and adjustment device and the longitudinal linear drive and adjustment device 94 are all screw-slide devices. The lateral linear drive device adopts a screw-slider device.

In the process of application, the size-variable γ-ray detection collimator 3 can realize the size change of the through hole on the end face of the detector collimation by setting parameters;

At the same time, the probe position of the detector 8 can be automatically adjusted by the adjustment device 9 to keep its center concentric with the center of the end face opening of the collimating detector; and then the corresponding experimental opening conditions are simulated to realize the detection of end faces of different sizes, passing through the middle cylindrical object To detect nuclear radioactive sources, and then study the characteristics of radioactive sources. Specifically, the γ-ray collimation detection system includes a base 1; a vertical slide 5 is provided on one side of the base 1; a lifting platform 2 is provided on the base 1; Mounting plate 3; the mounting plate 3 is installed on the lifting platform 2 through the lateral linear drive device; through the lifting and lowering of the lifting platform 2 and the horizontal movement of the mounting plate 3, the collimating detector module can be accurately moved up and down and accurately positioned to ensure The center of the probe and the center of the radiation source are on the same center line, and the movement accuracy is controlled at 0.05mm. The whole movement process is smooth and stable, and the phenomenon of sudden stop and sudden movement is not allowed.

To sum up, the size-variable gamma-ray detection collimator of the present invention includes a fixed slider, a top horizontal slider, a vertical slider, and a bottom horizontal slider. The sliders can be moved, so that the size of the area enclosed by the four sliders can be changed, so as to realize the adjustment of the size of the through-hole on the collimation end face of the detector, so as to facilitate the detection of different radioactive rays; it can improve the use of the collimator. scope.

The γ-ray collimation detection system of the present invention can automatically adjust the position of the probe to keep its center concentric with the center of the end face opening of the collimation detector, and then simulate Various experimental opening conditions are used to detect the nuclear radiation source through the intermediate cylindrical object under the condition of detecting end faces of different sizes, and then study the characteristics of the radioactive source.

The L-shaped support platform of the collimation detector assembly realizes the precise movement and positioning of the collimation detector module up and down under the operation of the automatic control platform, ensuring that the center of the probe and the center of the radiation source are on the same center line, and the movement accuracy is controlled within ±0.05 mm; the whole movement process is smooth and stable.

Claims (8)

1. A variable-size gamma-ray detection collimator characterized by: comprises a bracket (6), a fixed slide block (31), a top horizontal slide block (32), a vertical slide block (33) and a bottom horizontal slide block (34);

the top horizontal sliding block (32) is horizontally arranged, the fixed sliding block (31) is vertically arranged, one end of the fixed sliding block (31) is arranged below one end of the top horizontal sliding block (32), the bottom horizontal sliding block (34) is horizontally arranged, the bottom horizontal sliding block (34) is positioned below the top horizontal sliding block (32), and one end of the bottom horizontal sliding block (34) is positioned on one side of the lower end of the fixed sliding block (31);

the vertical sliding block (33) is vertically arranged, and one end of the vertical sliding block (33) is positioned above one end of the bottom horizontal sliding block (34); one end of the top horizontal sliding block (32) is positioned on one side of the upper end of the vertical sliding block (33);

the fixed sliding block (31) is fixedly arranged on the bracket (6); the top horizontal sliding block (35) is arranged on the bracket (6) through a horizontal linear driving device (32); the bottom horizontal sliding block (34) is installed on the support (6) through a vertical linear driving device (37); the vertical sliding block (33) is arranged on the bracket (6) through a vertical sliding horizontal linear driving bidirectional moving device (36); the vertical sliding block (33) is driven by a vertical sliding horizontal linear driving bidirectional moving device (36) to realize horizontal movement and vertical linear follow-up.

2. A variable-size gamma ray detection collimator as claimed in claim 1 in which: the fixed sliding block (31), the top horizontal sliding block (32), the vertical sliding block (33) and the bottom horizontal sliding block (34) are all made of tungsten alloy.

3. A variable-size gamma ray detection collimator as claimed in claim 2 in which: and the horizontal linear driving device (32) and the vertical linear driving device (37) both adopt a screw rod sliding table.

4. A variable-size gamma ray detection collimator as claimed in claim 3 in which: the vertical sliding horizontal linear driving bidirectional moving device (36) comprises a horizontal linear driving screw rod sliding table and a vertical linear driving screw rod sliding table.

5. A gamma ray collimation detection system, characterized by: comprising a variable-size gamma-ray detection collimator (3) as claimed in any one of claims 1 to 4;

also comprises a base (1); a vertical sliding plate (5) is arranged on one side of the base (1); a lifting platform (2) is arranged on the base (1); the lifting platform (2) is provided with a mounting plate (3) in a sliding way; the mounting plate (3) is mounted on the lifting platform (2) through a transverse linear driving device;

the gamma ray detection collimator (3) with variable size is arranged on the mounting plate (3); the bracket (6) is fixedly arranged on the mounting plate (13);

a detector (8) is arranged on one side of the gamma ray detection collimator (3) with the variable size; the detector (8) is mounted on an adjusting device (9) which can be moved vertically and horizontally.

6. A gamma ray collimation detection system as recited in claim 5, wherein: the adjusting device (9) comprises an adjusting bracket (91); a sliding seat (92) which is vertically installed in a sliding manner is arranged on the adjusting bracket (91); the sliding seat (92) is arranged on the adjusting bracket (91) through a vertical linear driving adjusting device;

an adjusting plate (93) is arranged on the sliding seat (92); the adjusting plate (93) is mounted on the slide (92) by means of a longitudinal linear drive adjusting device (94).

7. A gamma ray collimation detection system as recited in claim 5, wherein: the vertical linear driving adjusting device and the longitudinal linear driving adjusting device (94) both adopt screw rod sliding block devices.

8. A gamma ray collimation detection system as recited in claim 5, wherein: the transverse linear driving device adopts a screw rod sliding block device.

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