CN114373513A - Method for analyzing dose unevenness of cobalt source irradiation test - Google Patents

Method for analyzing dose unevenness of cobalt source irradiation test Download PDF

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CN114373513A
CN114373513A CN202111582607.1A CN202111582607A CN114373513A CN 114373513 A CN114373513 A CN 114373513A CN 202111582607 A CN202111582607 A CN 202111582607A CN 114373513 A CN114373513 A CN 114373513A
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cobalt
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蒋继成
赵弘韬
姚钢
田波
张楠
张玉宝
杨仲秋
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Heilongjiang Atomic Energy Research Institute
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Abstract

A method for analyzing dose unevenness of a cobalt source irradiation test. In the existing cobalt source irradiation test, potassium dichromate (silver) dosimeters are used for calibrating a radiation field area at a fixed distance, and the size and the material of a test sample are not followed for prediction calculation. The invention comprises the following steps:60performing MC geometric modeling on a CO radioactive source;60selecting CO radioactive source materials; establishing a source bit geometry; a method of simulating absorbed dose; verifying and analyzing a calculation result; simulation result prediction and verificationVerifying; a color map of absorbed dose in different planes; test sample unevenness estimation. The method is used for analyzing the dose unevenness of the cobalt source irradiation test.

Description

Method for analyzing dose unevenness of cobalt source irradiation test
Technical Field
The invention relates to the technical field of computers and cores, in particular to a method for analyzing dose unevenness of a cobalt source irradiation test.
Background
The cobalt source irradiation device is widely applied to the fields of space environment simulation of aerospace devices, food preservation, Chinese herbal medicine and sterilization of medical instruments,60the Co radioactive element can emit gamma rays with two energies of 1.17Mev and 1..33Mev, and can cause physical and chemical effects on substances. Compared with a plate-mounted cobalt source device, the flower basket-shaped cobalt source device has relatively uniform spatial dose distribution and is an ideal source structure for an irradiation test. Current irradiation test standards: QJ 10004-2008 < semiconductor device total dose radiation test method for aerospace >, ISO11137-2 < medical health care product sterilization-radiation sterilization > and the like all provide requirements for the uniformity of radiation absorbed dose of a sample, and particularly in the processes of scientific test and precise medical instrument radiation test, the sample is expensive, the pre-test cost is extremely high, and the absorbed dose and the unevenness directly influence the test result.
The existing cobalt source irradiation test adopts potassium dichromate (silver) dosimeters to calibrate a radiation field area at a fixed distance, the size and the material of a test sample are not followed for prediction calculation, and due to the fact that the dose rate is in inverse proportion to a single room of distance, when a high dose rate and a short distance (the distance from the center of a radioactive source is less than 3-5 times of the source length) are carried out, the dose rate is approximately calculated as a point source by adopting an empirical formula, the error is extremely large, and reference is difficult to provide for the design of a test scheme. In view of the above, it is necessary to develop a method capable of simulating the dose non-uniformity estimation of the cobalt source irradiation test for the evaluation of the irradiation test scheme.
Disclosure of Invention
The invention aims to provide a method for analyzing the dose unevenness of a cobalt source irradiation test.
The above purpose is realized by the following technical scheme:
a method for analyzing the dose unevenness of a cobalt source irradiation test comprises the following steps:
（1）60performing MC geometric modeling on a CO radioactive source;
（2）60selecting CO radioactive source materials;
the cobalt source device utilizes a radioactive cobalt-60 source rod, the interior of which is60Co element, stainless steel wrapped outside, cobalt source irradiation chamber air, using MCNP5 program involving 3 materials use, wherein m1 represents air, m2 represents stainless steel, m3 represents60Co；
(3) Establishing a source bit geometry;
(4) a method of simulating absorbed dose;
selecting a flux method for counting and calculating, multiplying the total particle flux by a specific potential energy factor of photons in the material to obtain equivalent dose rate of the corresponding position, and obtaining dose rate analog values of different coordinates under a space coordinate by using a fmesh card;
(5) verifying and analyzing a calculation result;
writing a particle transportation program by using the method, and drawing an absorption dosage rate overlook distribution map;
(6) predicting and verifying a simulation result;
the potassium dichromate (silver) dosimeter is used for carrying out dosage test on different positions in a dosage field, the dosage test is compared with a simulation result, the relative error is controlled within 5 percent, and the fact that the dosage rate calculated by a simulation program can be used for predicting the radiation dosage is proved;
(7) a color map of absorbed dose in different planes;
(8) test sample unevenness estimation.
The method for analyzing the dose unevenness of the cobalt source irradiation test comprises the following specific steps of (1): simulating an absorption process of photons of 1keV-100MeV in a substance, a transport process of neutrons of 10MeV-20MeV in most nuclides and an interaction process of electrons of 1keV-1GeV and the substance by using an MCNP program, wherein input files of the MCNP include an INP file, an XSDIR file and a section database file, the file to be filled by a user is the INP file, and geometric modeling is performed according to the activity and the structure of a radioactive source of the device.
The method for analyzing the dose unevenness of the cobalt source irradiation test comprises the following steps of (3): comprises a cuboid region with length, width and height of 4m, and the total activity of the irradiation device is 3.7 multiplied by 1015Bq, wherein the irradiation sources are distributed in a basket shape and consist of 24 source rods, 22 of the source rods are cobalt sources, and 2 of the source rods are false sources;
the source rods adopt an arrangement mode that 4 source rods are arranged in the center and 20 rods are arranged at the periphery, wherein 2 false sources are symmetrically arranged among the 4 rods in the center;
the red area of the center of the source rod is a cobalt radioactive source with the diameter of 3.5mm, the peripheral yellow area is a stainless steel outer skin with the thickness of 2mm, the included angle between two adjacent peripheral radioactive sources and the connecting line of the circle centers of the whole circular area is 18 degrees, the distance between the outer ring radioactive source and the circle center is 24.2 centimeters, the distance between the inner ring radioactive source and the circle center is 12.1 centimeters, and the height of each radioactive source is 46 cm.
The method for analyzing the dose unevenness of the cobalt source irradiation test comprises the following specific steps of (6): the method comprises the steps of carrying out dose testing on different positions in a dose field by using a potassium dichromate (silver) dosimeter, comparing with a simulation result, controlling a relative error within 5%, proving that the dose rate obtained by calculation of a simulation program can be used for predicting the radiation dose, carrying out actual measurement on the short-distance absorption dose rate of an irradiation device, respectively recording the absorption dose rates corresponding to a plurality of positions which are located at the north side of an irradiation source and are different from the center of the irradiation device, and comparing the numerical value calculated by the program with the numerical value to obtain the errors between prediction results and actual values of different positions.
The method for analyzing the dose unevenness of the cobalt source irradiation test comprises the following specific steps of (8): establishing a space coordinate (x, y, z) corresponding to the experimental sample and the mcnp simulation program according to the preset position, comparing the space coordinate with a simulation program grid counting result storage mestal file result to obtain a sample preset station absorbed dose estimation value, screening the maximum absorbed dose and the minimum absorbed dose of different planes, wherein the absorbed dose unevenness estimation calculation formula is as follows:
Figure DEST_PATH_IMAGE002
。
has the advantages that:
1. the invention carries out estimation of the unevenness of absorbed dose according to the size and the space position of a sample before the test, evaluates the test scheme and can effectively improve the utilization rate of the cobalt source device and the accuracy of the irradiation test.
2. The invention uses MCNP5 to calculate the flux value of the ray particles passing through a certain area, and the equivalent dose rate of the corresponding position can be obtained after the total particle flux is multiplied by the specific potential energy factor of the photons in the material, and the dose rate analog values of different coordinates under the space coordinate can be obtained by using the fmesh card.
3. According to the invention, potassium dichromate (silver) dosimeters are used for carrying out dosage test on different positions in a dosage field, and compared with simulation results, the relative error is controlled within 5%, and the fact that the dosage rate calculated by a simulation program can be used for predicting the radiation dosage is proved.
4. The invention uses a symmetrical transformation mode to establish the description of each module, and the method can reduce the line number when writing the program and the computer computation amount when the program runs.
Description of the drawings:
FIG. 1 is a diagram of a source rod arrangement;
FIG. 2 is a three-view illustration of an irradiation source;
FIG. 3 is a top view of the absorbed dose rate;
FIG. 4 is a dose distribution diagram of an east direction of a cobalt source device two atomic energy yard 3cm away from a radioactive source;
FIG. 5 is a diagram showing a dose distribution of a cobalt source device from the atomic energy yard in a direction from the south of 3cm from a radioactive source;
FIG. 6 is a western dose distribution diagram of the two-type cobalt source device of atomic energy yard at a distance of 3cm from the radiation source;
FIG. 7 is a dose distribution diagram of a cobalt source device from atomic energy agency in the north direction 3cm away from the radioactive source.
The specific implementation mode is as follows:
example 1:
a method for analyzing the dose unevenness of a cobalt source irradiation test comprises the following steps:
（1）60performing MC geometric modeling on a CO radioactive source;
（2）60selecting CO radioactive source materials;
the cobalt source device utilizes a radioactive cobalt-60 source rod, the interior of which is60Co element, stainless steel wrapped outside, cobalt source irradiation chamber air, using MCNP5 program involving 3 materials use, wherein m1 represents air, m2 represents stainless steel, m3 represents60Co；
(3) Establishing a source bit geometry;
(4) a method of simulating absorbed dose;
selecting a flux method for counting and calculating, multiplying the total particle flux by a specific potential energy factor of photons in the material to obtain equivalent dose rate of the corresponding position, and obtaining dose rate analog values of different coordinates under a space coordinate by using a fmesh card;
(5) verifying and analyzing a calculation result;
the particle transport program was programmed using the method described above and a top view profile of the absorption dose rate was plotted as shown in fig. 3.
(6) Predicting and verifying a simulation result;
the potassium dichromate (silver) dosimeter is used for carrying out dosage test on different positions in a dosage field, the dosage test is compared with a simulation result, the relative error is controlled within 5 percent, and the fact that the dosage rate calculated by a simulation program can be used for predicting the radiation dosage is proved;
(7) a color map of absorbed dose in different planes;
on the basis of verifying the reliability and accuracy of the program, the matlab software is utilized to draw the dose rate distribution conditions of different plane test devices from different directions, FIG. 4 shows the dose distribution of the two-type cobalt source device of atomic energy yard at the distance of 3cm from the radioactive source in the east, south, west and north directions, FIG. 7, FIG. 5, FIG. 6 and FIG. 4 are the equivalent dose rate distribution diagrams of the irradiation device at north, south, west and east, comparing 4 images, it can be seen that the cobalt sources in all directions are uniformly arranged in the whole irradiation device, although 24 cobalt sources are symmetrically arranged, however, dose rate distribution is not symmetrical, and as can be seen from fig. 3 and 4, the activity of the radiation source in the northwest and southeast directions is very low, resulting in smaller equivalent dose rates corresponding to the two positions, the activity is very high in the north and the equivalent dose rate reaches the maximum value, so that reference is provided for the design of an experimental scheme.
(8) Test sample unevenness estimation.
Example 2:
according to the method for analyzing the dose unevenness of the cobalt source irradiation test described in the embodiment 1, the specific process of the step (1) is as follows: simulating an absorption process of photons of 1keV-100MeV in a substance, a transport process of neutrons of 10MeV-20MeV in most nuclides and an interaction process of electrons of 1keV-1GeV and the substance by using an MCNP program, wherein input files of the MCNP include an INP file, an XSDIR file and a section database file, the file to be filled by a user is the INP file, and geometric modeling is performed according to the activity and the structure of a radioactive source of the device.
Example 3:
according to the method for analyzing the dose non-uniformity of the cobalt source irradiation test in the embodiment 1 or 2, the source bit geometry of the step (3) is as follows: comprises a cuboid region with length, width and height of 4m, and the total activity of the irradiation device is 3.7 multiplied by 1015Bq, wherein the irradiation sources are distributed in a basket shape and consist of 24 source rods, 22 of the source rods are cobalt sources, and 2 of the source rods are false sources;
the source rods adopt an arrangement mode that 4 source rods are arranged in the center and 20 rods are arranged at the periphery, wherein 2 false sources are symmetrically arranged among the 4 rods in the center;
the red area of the center of the source rod is a cobalt radioactive source with the diameter of 3.5mm, the peripheral yellow area is a stainless steel outer skin with the thickness of 2mm, the included angle between two adjacent peripheral radioactive sources and the connecting line of the circle centers of the whole circular area is 18 degrees, the distance between the outer ring radioactive source and the circle center is 24.2 centimeters, the distance between the inner ring radioactive source and the circle center is 12.1 centimeters, and the height of each radioactive source is 46 cm.
Because the irradiation source is of a symmetrical structure, the front view (fig. 2 a) and the side view (fig. 2 b) are identical in shape, but the corresponding volume element numbers are different, and the patent uses a symmetrical transformation mode to establish the description of each module, which can reduce the number of lines during program writing and the computer calculation amount during program running.
Example 4:
the method for analyzing the dose non-uniformity of the cobalt source irradiation test according to the embodiment 1, 2 or 3, wherein the specific process of the step (6) is as follows: the method comprises the steps of carrying out dose testing on different positions in a dose field by using a potassium dichromate (silver) dosimeter, comparing with a simulation result, controlling a relative error within 5%, proving that the dose rate obtained by calculation of a simulation program can be used for predicting the radiation dose, carrying out actual measurement on the short-distance absorption dose rate of an irradiation device, respectively recording the absorption dose rates corresponding to a plurality of positions which are located at the north side of an irradiation source and are different from the center of the irradiation device, and comparing the numerical value calculated by the program with the numerical value to obtain the errors between prediction results and actual values of different positions.
See table 1 for comparison:
TABLE 1 comparison of the calculated results of the procedure with the actual measured values
Position number Height from center of irradiation source Calculated program value (Gy/h) Actual measurement value (Gy/h) Relative error (%)
1 0 20021 20052 0.154598045
2 1 19925 19934 0.045148992
3 4 18884 18872 0.063586265
4 5 18681 18990 1.627172196
5 9 17742 17339 2.324240152
6 19 10140 9731 4.203062378
Example 5:
according to the method for analyzing the dose unevenness of the cobalt source irradiation test described in the embodiment 1, 2, 3 or 4, the specific process of the step (8) is as follows: establishing a space coordinate (x, y, z) corresponding to the experimental sample and the mcnp simulation program according to the preset position, comparing the space coordinate with a simulation program grid counting result storage mestal file result to obtain a sample preset station absorbed dose estimation value, screening the maximum absorbed dose and the minimum absorbed dose of different planes, wherein the absorbed dose unevenness estimation calculation formula is as follows:
Figure 348141DEST_PATH_IMAGE002
。

Claims (5)

1. a cobalt source irradiation test dose non-uniformity analysis method is characterized by comprising the following steps: the method comprises the following steps:
（1）60MC geometric modeling of a CO radioactive source experimental device;
the cobalt source device utilizes a radioactive cobalt-60 source rod, the interior of which is60Co element, stainless steel wrapped outside, cobalt source irradiation chamber air, using MCNP5 program involving 3 materials use, wherein m1 represents air, m2 represents stainless steel, m3 represents60Co；
(2) Establishing a source bit geometry;
(3) a method of simulating absorbed dose;
selecting a flux method for counting and calculating, multiplying the total particle flux by a specific potential energy factor of photons in the material to obtain equivalent dose rate of the corresponding position, and obtaining dose rate analog values of different coordinates under a space coordinate by using a fmesh card;
(4) verifying and analyzing a calculation result;
writing a particle transportation program by using the method, and drawing an absorption dosage rate overlook distribution map;
(5) predicting and verifying a simulation result;
the potassium dichromate (silver) dosimeter is used for carrying out dosage test on different positions in a dosage field, the dosage test is compared with a simulation result, the relative error is controlled within 5 percent, and the fact that the dosage rate calculated by a simulation program can be used for predicting the radiation dosage is proved;
(6) a color map of absorbed dose in different planes;
(7) test sample unevenness estimation.
2. The method for analyzing the dose unevenness of the cobalt source irradiation test according to claim 1, wherein: the specific process of the step (1) is as follows: simulating an absorption process of photons of 1keV-100MeV in a substance, a transport process of neutrons of 10MeV-20MeV in most nuclides and an interaction process of electrons of 1keV-1GeV and the substance by using an MCNP program, wherein input files of the MCNP include an INP file, an XSDIR file and a section database file, the file to be filled by a user is the INP file, and geometric modeling is performed according to the activity and the structure of a radioactive source of the device.
3. The method for analyzing the dose unevenness of the cobalt source irradiation test according to claim 2, wherein: the source bit geometry structure of the step (3) is as follows: comprises a cuboid region with length, width and height of 4m, and the total activity of the irradiation device is 3.7 multiplied by 1015Bq, wherein the irradiation sources are distributed in a basket shape and consist of 24 source rods, 22 are cobalt sources, and 2 are unfilled sources;
the source rods adopt an arrangement mode that 4 source rods are arranged in the center and 20 rods are arranged at the periphery, wherein 2 false sources are symmetrically arranged among the 4 rods in the center;
the red area of the center of the source rod is a cobalt radioactive source with the diameter of 3.5mm, the peripheral yellow area is a stainless steel outer skin with the thickness of 2mm, the included angle between two adjacent peripheral radioactive sources and the connecting line of the circle centers of the whole circular area is 18 degrees, the distance between the outer ring radioactive source and the circle center is 24.2 centimeters, the distance between the inner ring radioactive source and the circle center is 12.1 centimeters, and the height of each radioactive source is 46 cm.
4. The method for analyzing the dose unevenness of the cobalt source irradiation test according to claim 3, wherein: the specific process of the step (6) is as follows: the method comprises the steps of carrying out dose testing on different positions in a dose field by using a potassium dichromate (silver) dosimeter, comparing with a simulation result, controlling a relative error within 5%, proving that the dose rate obtained by calculation of a simulation program can be used for predicting the radiation dose, carrying out actual measurement on the short-distance absorption dose rate of an irradiation device, respectively recording the absorption dose rates corresponding to a plurality of positions which are located at the north side of an irradiation source and are different from the center of the irradiation device, and comparing the numerical value calculated by the program with the numerical value to obtain the errors between prediction results and actual values of different positions.
5. The method for analyzing the dose unevenness of the cobalt source irradiation test according to claim 4, wherein: the specific process of the step (8) is as follows: establishing a space coordinate (x, y, z) corresponding to the experimental sample and the mcnp simulation program according to the preset position, comparing the space coordinate with a simulation program grid counting result storage mestal file result to obtain a sample preset station absorbed dose estimation value, screening the maximum absorbed dose and the minimum absorbed dose of different planes, wherein the absorbed dose unevenness estimation calculation formula is as follows:
Figure 471519DEST_PATH_IMAGE001
。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115147596A (en) * 2022-09-06 2022-10-04 南通鼎彩新材料科技有限公司 Irradiation dose control method and system for heat-shrinkable tube production process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115147596A (en) * 2022-09-06 2022-10-04 南通鼎彩新材料科技有限公司 Irradiation dose control method and system for heat-shrinkable tube production process

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