CN104267051B - Wire earth radiation test device and method - Google Patents

Abstract

The invention discloses a conductor ground radiation test device. Using the invention can make the irradiated sample continuously rotate at a uniform speed during irradiation to ensure uniform deposition of the irradiated dose of the sample. The wire ground radiation test device of the present invention includes an irradiation source, a motor, a motor shaft, a fixture, a vertical fixing bracket, a vertical moving bracket, and a horizontal base, wherein the motor shaft rotates at an average speed of no more than 20 rpm, and the irradiation The number of rotations within the time is greater than 10; when the energy of the radiation source is (R ₂ ‑R ₁ ), the energy corresponding to the dose deposition curve in the range of (R ₁ /R ₂ )±15% on the ordinate is the radiation source energy. The invention has the advantages of simple structure and convenient use, and can uniformly deposit high-energy electrons in cylindrical materials such as wires.

Description

A kind of conductor ground radiation test device and method

technical field

The invention relates to the technical field of radiation effects, in particular to a ground radiation test device and method for wires.

Background technique

When selecting materials in spacecraft design, the influence of radiation on material performance effects must be considered to ensure that it can complete the intended function in the space radiation environment. Therefore, the ground radiation test must be carried out before the material is used in space. The simulated sources are usually gamma-ray sources and high-energy electrons.

High-energy electrons have a high dose rate, which can shorten the test cycle and improve test efficiency. However, due to the limited penetration ability of high-energy electrons, the use of high-energy electrons as a radiation simulation source is limited.

At present, when high-energy electrons are used as the simulation source, in order to increase the deposition depth of high-energy electrons in the material, the method of turning over the sample is adopted. For flat materials, using electrons with the same energy can effectively improve the irradiatability of the material. However, for cylindrical materials such as wires commonly used in the evaluation of space radiation effects, the uniformity of dose deposition in the material will be deteriorated.

Contents of the invention

In view of this, the present invention provides a wire ground radiation test device, which can make the irradiated sample continuously rotate at a uniform speed to ensure uniform deposition of the irradiated dose of the sample.

The wire ground radiation test device of the present invention includes an irradiation source, a motor, a motor shaft, a fixture, a vertical fixed support, a vertical movable support and a horizontal base, wherein the vertical fixed support is fixedly mounted on the horizontal base; the motor is fixedly mounted on the vertical fixed On the bracket, the motor shaft passes through the vertical fixed bracket; the fixture is fixedly installed on the motor shaft; the vertical mobile bracket is installed on the horizontal base, opposite to the vertical fixed bracket, and can move along the horizontal base; the vertical mobile bracket is set at the relative position of the motor shaft. There are openings; wherein, the motor shaft rotates at a uniform speed, the speed does not exceed 20 rpm, and the number of rotations within the irradiation time is greater than 10;

The method of determining the energy of the radiation source is: find the dose in the range of (R 1 /R 2 ) ± 15% when the abscissa is (R ₂ -R ₁ ) and the ordinate is in the range of (R ₁ /R ₂ )±15% from the dose deposition curve group of the insulating layer material of the wire Deposition curve, the energy corresponding to the dose deposition curve is the energy of the radiation source, where R ₂ is the radius of the insulating layer of the wire, and R ₁ is the radius of the copper core of the wire.

Wherein, the clamp, the vertical fixing bracket, the vertical moving bracket and the horizontal base are made of duralumin material.

A method for conducting a conductor ground radiation test using the above-mentioned conductor ground radiation test device, comprising the following steps:

Step 1, place the wire on the wire ground radiation test device, one end of the wire is fixed by a clamp, and the other end is placed in the hole of the vertical moving bracket, and the distance between the vertical moving bracket and the vertical fixed bracket is set according to the length of the wire;

Step 2, place the wire ground radiation test device under the irradiation source, adjust the motor speed so that the motor rotates at a constant speed, and the number of rotations exceeds 10 within the specified irradiation time, and the motor speed does not exceed 20 rpm;

Step 3, according to the dose deposition curves of high-energy electrons with different energies in the wire insulation layer material, select the dose deposition when the abscissa is (R ₂ -R ₁ ) and the ordinate is within the range of (R ₁ /R ₂ )±15% Curve, the energy corresponding to the dose deposition curve is the energy of the radiation source, the radiation dose rate is the required dose rate, and the wire is irradiated for the specified irradiation time.

Beneficial effect:

The invention has the advantages of simple structure and convenient use, and can uniformly deposit high-energy electrons in cylindrical materials such as wires.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device of the present invention.

Figure 2 is a schematic diagram of wire specifications.

Figure 3 is a typical dose deposition curve of high-energy electrons (1 Mev) in a material (polytetrafluoroethylene).

Figure 4 is a schematic diagram of wire irradiation.

Among them, 1-motor (with deceleration device), 2-motor shaft, 3-fixture, 4-vertical fixed bracket, 5-vertical moving bracket, 6-horizontal base, 7-wire.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

The present invention provides a wire ground radiation test device, as shown in Figure 1, comprising a motor 1, a motor shaft 2, a clamp 3, a vertical fixed support 4, a vertical mobile support 5 and a horizontal base 6, wherein the vertical fixed support 4 is fixed Installed on the horizontal base 6; the motor 1 is fixedly installed on the vertical fixed bracket 4, and the motor shaft 2 passes through the vertical fixed bracket 4; the clamp 3 is fixedly installed on the motor shaft 2 for clamping the wire 7; the vertical mobile bracket 5 is installed On the horizontal base 6, opposite to the vertical fixed support 4, the vertical mobile support 5 is provided with an opening at the relative position of the motor shaft 2, for supporting the wire 7, the vertical mobile support 5 can move along the horizontal base, according to the length of the wire 7 Set the distance between the vertical fixed support 4 and the vertical mobile support 5 .

The invention adopts the moving device to make the sample material rotate at a uniform speed during irradiation, so that the irradiation dose is uniformly deposited in the material, and is suitable for high-energy electron irradiation tests of cylindrical materials such as wires.

Wherein, since aluminum has little influence on the irradiation field during irradiation, the jig 3 , the vertical fixed support 4 , the vertical movable support 5 and the horizontal base 6 are made of duralumin.

Considering that the rotation of the motor shaft 2 cannot be fully controlled when the motor 1 rotates, resulting in uneven irradiation, the analysis shows that within the irradiation time, when the number of rotations of the motor is greater than 10, the unevenness can be guaranteed to be less than 5%. , Therefore, during the irradiation test, the number of rotations of the motor within the control irradiation time is greater than 10. Simultaneously, if the motor speed is too fast, the wire 7 may be worn at the vertically moving support 5, therefore, the motor speed is generally controlled to be no more than 20 rpm. To this end, a deceleration device is added to the motor to achieve motor speed control.

When the wire rotates at a constant speed, the energy of the electron beam also affects the uniformity of the deposition. If the energy is too small, uniform deposition cannot be achieved during the rotation; if the energy is too high, the deposition depth will pass through the irradiated half but not It can completely penetrate the entire material and affect the deposition uniformity of the other half; if the energy is large enough and the deposition depth is greater than the diameter of the material, the irradiation test can be realized without the device of the present invention.

For a cylinder such as a wire, as shown in Figure 2, it includes an insulating layer and a copper core, wherein the radius of the insulating layer is R ₂ , and the radius of the copper core is R ₁ . Considering that the electron beam is irradiated on the inner layer of the cylinder , although the energy is reduced, its irradiated area is also reduced at the same time. Therefore, the same irradiated density (irradiated energy/irradiated area) can be used to achieve the uniformity of irradiation inside and outside the cylinder, namely:

Among them, 2πR ₂ is the circumference length of radius R ₂ , that is, the surface area when a cylinder with radius R ₂ is stretched into a plane; 2πR ₁ is the circumference length of radius R ₁ , that is, a cylinder with radius R ₁ is stretched into a plane D ₂ is the energy deposited on the surface by an electron of a specific energy; D ₁ is the corresponding energy deposited at (R ₂ -R ₁ ).

Since the electron beam dose deposition curve is related to the irradiated material and the energy of the electron beam, after determining the irradiated material, use electron beams of different energies to irradiate the wire insulation layer material to obtain the dose deposition curve group; in the dose deposition curve group , select the dose deposition curve whose abscissa is (R ₂ -R ₁ ) and whose ordinate is within the range of (R ₁ /R ₂ )±15%, the electron energy corresponding to the dose deposition curve is the selected electron beam energy.

For example, the outer insulation material of a wire is polytetrafluoroethylene, and its radius R ₂ is 4mm; the inner layer is copper core, and the radius R ₁ is 1mm; electron irradiation is required for 10 minutes. First wire is placed on the wire ground radiation test device, one end of the wire is fixed by the clamp 3, the other end is placed in the hole of the vertical mobile support 5, and the distance between the vertical mobile support 5 and the vertical fixed support 4 is set according to the length of the wire; then Place the wire ground radiation test device under the electron beam, as shown in Figure 4, shield the place that does not need irradiation, adjust the motor speed to 10 rpm, according to R ₂ -R ₁ = 3mm, 2πR ₁ /2πR ₂ =1/4=25%, and the dose deposition curve (Fig. 3) of high-energy electrons (1Mev) in the polytetrafluoroethylene material shows that the 1MeV electron beam meets the requirements, therefore, the selected electron beam energy is 1MeV, and the dose rate The dose rate is required to carry out the irradiation test on the wire, and the irradiation time is 10 minutes. In this way, the uniformity of the irradiation dose to the wire can be ensured.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. a kind of wire terrestrial surface radiation experimental rig, it is characterised in that include：Motor (1), motor rotary shaft (2), fixture (3), vertical fixed support (4), vertically moving support (5) and horizontal base (6), wherein, vertical fixed support (4) fixed installation On horizontal base (6)；Motor (1) is fixedly mounted in vertical fixed support (4), and motor rotary shaft (2) is through vertically admittedly Fixed rack (4)；Fixture (3) is fixedly mounted on motor rotary shaft (2)；Vertically moving support (5) is installed in horizontal base (6) On, it is relative with vertical fixed support (4), can move along horizontal base；Phase of the vertically moving support (5) in motor rotary shaft (2) Para-position has installed perforate；Wherein, motor rotary shaft (2) average rate rotation, rotating speed are less than 20 revs/min, and rotate in exposure time The number of turns is more than 10；

The determination mode of radiant source is：From the ordinate dosage sedimentation curve group of the insulating layer material of wire finding abscissa is (R₂-R₁) when, vertical coordinate is in (R₁/R₂) ordinate dosage sedimentation curve in the range of ± 15%, the corresponding energy of ordinate dosage sedimentation curve is Radiant source, wherein, R₂For the radius of wire insulation, R₁For the radius of wire copper core.

2. wire terrestrial surface radiation experimental rig as claimed in claim 1, it is characterised in that the fixture (3), vertical fixed Frame (4), vertically moving support (5) and horizontal base (6) are made using duralumin material.

3. a kind of wire terrestrial surface radiation test method, it is characterised in that using wire ground as claimed in claim 1 or 2 spoke Penetrating assay device carries out irradiation test, comprises the following steps that：

Step 1, wire is placed in wire terrestrial surface radiation experimental rig, and wire one end is fixed by fixture (3), and the other end is placed In the hole of vertically moving support (5), arranged between vertically moving support (5) and vertical fixed support (4) according to conductor length Distance；

Step 2, wire terrestrial surface radiation experimental rig is placed on below radiation source, adjusts motor speed so that motor is even Speed rotation, and the number of turns is rotated in the exposure time of regulation more than 10, and motor speed is less than 20 revs/min；

Step 3, according to ordinate dosage sedimentation curve of the different-energy high energy electron in wire insulation layer material, selection abscissa is (R₂-R₁) when, vertical coordinate is in (R₁/R₂) ordinate dosage sedimentation curve in the range of ± 15%, the corresponding energy of ordinate dosage sedimentation curve is Radiant source, radiation dose rate carry out irradiation test, the exposure time that irradiation specifies to require close rate to wire.