放射性同位素伽玛源准直照射辐射场模拟研究

黄宇晨; 钱易坤; 冯鹏; 刘易鑫; 张颂; 何鹏; 魏彪; 毛本将; 朱亚地

doi:10.11884/HPLPB202133.200294

放射性同位素伽玛源准直照射辐射场模拟研究

doi: 10.11884/HPLPB202133.200294

黄宇晨^{1, 2,},
钱易坤^{1, 2},
冯鹏^2, ,,
刘易鑫¹,
张颂^{1, 2},
何鹏²,
魏彪²,
毛本将¹,
朱亚地¹

1.
中国工程物理研究院核物理与化学研究所，四川绵阳 621900
2.
重庆大学光电技术及系统教育部重点实验室，重庆 400044

基金项目: 国家自然科学基金青年基金项目（11805111）；国防科工局研究课题

详细信息

作者简介:
黄宇晨（1995—），男，硕士研究生，从事辐射屏蔽防护研究；710934794@qq.com

通讯作者:
冯　鹏（1981—），男，博士，副教授，从事核信号检测技术及其应用研究；coe-fp@cqu.edu.cn

中图分类号: TL72
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- 被引次数: 0
出版历程
- 收稿日期: 2020-10-27
- 修回日期: 2021-01-22
- 网络出版日期: 2021-03-30
- 刊出日期: 2021-03-05

Simulation of radiation field from isotopic gamma source collimation

Huang Yuchen^{1, 2
,},
Qian Yikun^{1, 2},
Feng Peng^{2
, ,},
Liu Yixin¹,
Zhang Song^{1, 2},
He Peng²,
Wei Biao²,
Mao Benjiang¹,
Zhu Yadi¹

1.
Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
2.
Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Chongqing University, Chongqing 400044, China

摘要

摘要: 针对各向同性伽玛源参考辐射场尺寸关键技术问题，GB/T 12162系列标准虽然进行了相关规定，但是该规定并未对准直照射状态下照射室尺寸提出具体要求。为减小用于辐射检测或监测类仪器仪表检定与量值校准时伽玛参考辐射场内散射影响，本文采用蒙特卡罗方法，研究了同位素放射源准直照射时，照射室尺寸变化对检验点处的剂量率值与能量分布的影响情况，获得了准直照射时伽玛辐射场照射室尺寸的边界条件，建立并完善了伽玛参考辐射场边界研究方法及相关标准细节，为准直照射状态下照射室尺寸设计提供了一种新方法或途径。
- 核仪器仪表校准 /
- 参考辐射 /
- 准直照射 /
- 蒙特卡罗 /
- 边界条件
Abstract: Aiming at the key technical issues of the reference radiation field size of isotropic sources, GB/T 12162 series of GB standards stipulates the size of the reference radiation field when using an isotropic source. However, there is no specific regulation for the size of the irradiation under collimation. To reduce the influence of scattering in the gamma reference radiation field when used for radiation detection or monitoring instrument verification and value calibration, Monte Carlo simulation was carried out to explore the effect of the size change of the irradiation chamber on the energy distribution and dose rate value during the radiation source collimation. The boundary conditions of the collimated gamma radiation irradiation chamber were obtained, and the details of the gamma reference radiation field boundary research method and related standards are established and improved. The study provides a new method or approach for the size design of the irradiation chamber under the collimated irradiation state.
- nuclear instrument calibration /
- reference radiation /
- collimated irradiation /
- Monte Carlo /
- boundary conditions

HTML全文

图 1 伽玛辐射场装置图

Figure 1. Gamma radiation device

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图 2 伽玛辐射场装置示意图

Figure 2. Schematic illustration of gamma radiation device

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图 3 伽玛辐射场MCNP模拟图

Figure 3. MCNP simulation diagram of gamma radiation field

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图 4 探测器引起¹³⁷Cs源辐射场剂量率分布变化

Figure 4. Changes in dose rate distribution of ¹³⁷Cs source radiation field brought by the introduction of detector

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图 5 探测器引起⁶⁰Co源辐射场剂量率分布变化

Figure 5. Changes in dose rate distribution of ⁶⁰Co source radiation field brought by the introduction of detector

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图 6 伽玛辐射场D₂值变化影响

Figure 6. Influence of various D₂ in gamma radiation field

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图 7 照射室宽高变化影响

Figure 7. Influence of irradiation chamber width and height variation

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图 8 辐射场空间平方反比关系图

Figure 8. Inverse squared attenuation law diagram of radiation field

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表 1 放射性核素的比活度及推荐的化学形态

Table 1. Specific activity and recommended chemical form of radionuclides

radionuclide	specific activity/（Bq·kg⁻¹）	recommended chemical form
⁶⁰Co	0.31	metal
¹³⁷Cs	0.079	chloride

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表 2 探测器厚度变化影响一览表

Table 2. Influence of detector thickness (aluminum shell thickness T)

T/mm	dose rate/（mSv·h⁻¹）		influence rate/%
T/mm	Cs	Co	Cs	Co
4.0	39.821	74.548	−1.87	−1.78
8.0	38.951	73.216	−4.02	−3.54
9.2	38.71	72.546	−4.61	−4.42
9.3	38.557	72.336	−4.99	−4.70
9.4	38.518	72.278	−5.08	−4.77
9.5	38.45	72.158	−5.25	−4.93
9.6	38.395	72.095	−5.39	−5.02
16.0	36.999	70.071	−8.83	−7.68
28.0	33.872	65.288	16.53	13.98
40.0	30.698	60.527	24.35	20.26

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表 3 伽玛辐射场D₁值变化影响一览表

Table 3. Influence of various D₁ in gamma radiation field

D₁/cm	dose rate/（mSv·h⁻¹）		influence rate/%
D₁/cm	Cs	Co	Cs	Co
10	38.644	72.56	−4.77	−4.40
20	21.727	40.807	−4.82	−4.42
30	13.898	26.103	−4.87	−4.47
40	9.646	18.117	−4.92	−4.53
50	7.082	13.308	−4.98	−4.54
54	6.336	11.905	−5.00	−4.57
55	6.168	11.589	−5.01	−4.57
60	5.419	10.184	−5.05	−4.59
70	4.28	8.043	−5.08	−4.63
80	3.464	6.511	−5.15	−4.69

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表 4 伽玛辐射场D₂值变化影响一览表

Table 4. Influence of various D₂ in gamma radiation field

D₂/cm	dose rate/（mSv·h⁻¹）		influence rate/%
D₂/cm	Cs	Co	Cs	Co
2.4	7.006	12.604	5.05	1.04
2.5	7.001	12.597	4.96	0.98
5	6.87	12.455	3.00	−0.16
10	6.698	12.275	0.43	−1.60
25	6.483	12.054	−2.81	−3.37
50	6.389	11.96	−4.21	−4.13
100	6.352	11.922	−4.76	−4.43
126	6.347	11.916	−4.84	−4.48

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表 5 照射室宽高变化影响一览表

Table 5. Influence of irradiation chamber width and height variation

width by height/(cm×cm)	dose rate/（mSv·h^-1）		influence rate/%
width by height/(cm×cm)	Cs	Co	Cs	Co
400×300	6.9703	12.563	4.51	0.71
100×100	6.9785	12.572	4.63	0.78
60×60	6.9961	12.589	4.89	0.91
56×56	6.9999	12.593	4.95	0.95
54×54	7.0046	12.595	5.02	0.96
40×40	7.0651	12.66	5.93	1.48
20×20	8.3402	14.58	25.05	16.87

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表 6 伽玛辐射场D₃值变化影响一览表

Table 6. Influence of various D₃ in gamma radiation field

D₃/cm	dose rate/（mSv·h⁻¹）		influence rate/%
D₃/cm	Cs	Co	Cs	Co
1	7.0009	12.594	4.97	0.95
4	7.0008	12.594	4.96	0.95
6	7.0007	12.594	4.96	0.95
8	7.0006	12.594	4.96	0.95
10	7.0006	12.594	4.96	0.95
12	7.0005	12.594	4.96	0.95
14	7.0004	12.594	4.96	0.95
16	7.0004	12.594	4.96	0.95

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表 7 辐射场空间平方反比变化一览表

Table 7. Inverse squared attenuation law changes of radiation field

D/cm	dose rate/（mSv·h⁻¹）				influence rate/%
	Cs		Co		Cs		Co
	detector	no detector	detector	no detector	detector	no detector	detector	no detector
25	58.437	58.443	109.3	109.28	4.61	0.01	4.31	0.02
30	40.581	40.615	75.902	75.91	4.54	0.08	4.27	0.01
40	22.827	22.916	42.695	42.766	4.25	0.39	4.12	0.17
50	14.609	14.772	27.325	27.472	3.59	1.12	3.78	0.54
60	10.145	10.434	18.976	19.254	2.01	2.85	2.95	1.47
63	9.202	9.548	17.211	17.547	1.16	3.76	2.49	1.95
64	8.917	9.286	16.678	17.036	0.84	4.14	2.31	2.15
65	8.645	9.037	16.169	16.551	0.48	4.54	2.12	2.36
66	8.385	8.803	15.682	16.092	0.09	4.99	1.86	2.61
67	8.136	8.583	15.218	15.656	0.36	5.49	1.65	2.88
70	7.454	8	13.941	14.483	1.95	7.33	0.74	3.89
74	6.67	7.392	12.475	13.202	4.96	10.83	0.95	5.83

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