无风条件下近地爆烟尘的大气γ电离辐射环境模拟

郭思禹; 程引会; 郭俊

doi:10.11884/HPLPB202436.230245

无风条件下近地爆烟尘的大气γ电离辐射环境模拟

doi: 10.11884/HPLPB202436.230245

西安交通大学电力设备电气绝缘国家重点实验室，西安 710049

详细信息

作者简介:
郭思禹，q1203941245@stu.xjtu.edu.cn

通讯作者:
郭　俊，junguo@mail.xjtu.edu.cn。

中图分类号: TL91;TL72
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- 文章访问数: 103
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- 被引次数: 0
出版历程
- 收稿日期: 2023-07-31
- 修回日期: 2023-12-19
- 录用日期: 2023-12-19
- 网络出版日期: 2023-12-27
- 刊出日期: 2024-02-29

Simulation of atmospheric γ ionizing radiation environment of near-ground nuclear explosion fallout under windless conditions

State Key Laboratory of Electrical Insulation and Power Equipment, Xi 'an Jiaotong University, Xi’an 710049, China

摘要

摘要: 近地爆烟尘由不同粒径尺度的放射性颗粒组成，且运动的时空尺度大。针对近地爆烟尘的大气γ电离辐射环境模拟这一难题，首先开展了γ大气辐射机理分析，进行了无风条件设定，建立了烟尘γ辐射的理论模型，其次引入和提出了相应的数值差分与积分算法，最后给出了对1 000 kt内华达近地爆烟尘在大气中的放射性活度和辐射剂量率的模拟算例，完成了一定的辐射环境时空演变规律总结与结果对比，对比发现本模型在保证活度结果一致性的同时，能计算出大气辐射剂量率的理论最大值。
- 近地爆烟尘 /
- 大气γ电离辐射 /
- 放射性活度 /
- 辐射剂量率
Abstract: Near-ground nuclear explosion fallout consists of radioactive particles of different particle size, and its motion has a large spatial and temporal scales. For the problem how to simulate the atmospheric γ ionizing radiation environment of the near-ground explosion fallout, in this paper, firstly, the mechanism analysis of atmospheric gamma radiation is carried out, the no-wind conditions are set up, and the theoretical model of fallout gamma radiation is established. Secondly, the corresponding numerical difference and integration algorithms are introduced and proposed. Finally, the simulation example of the radioactivity and radiative dose rate in the atmosphere of the 1000 kt Nevada near-ground explosion is given, a certain summary of the temporal and spatial evolution patterns of the radiation environment and the comparison of the results are accomplished, and the comparison reveals that the present model is able to calculate the theoretical maximum of the atmospheric radiation dose rate while ensuring the consistency of the activity results.
- near-ground nuclear explosion fallout /
- atmospheric γ ionizing radiation /
- radioactivity /
- radiative dose rate

HTML全文

图 1 点源辐射模型示意图

Figure 1. Schematic diagram of point source radiation model

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图 2 体源辐射模型示意图

Figure 2. Schematic diagram of body source radiation model

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图 3 1000 kt内华达近地爆烟尘的放射性活度

Figure 3. Radioactivity of 1000 kt Nevada near-ground nuclear explosion fallout

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图 4 1000 kt内华达近地爆烟尘的辐射剂量率

Figure 4. Radiative dose rate of 1000 kt Nevada near-ground nuclear explosion fallout

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图 5 两模型间放射性活度轴向密度的对比

Figure 5. Comparison of axial density of radioactive activity between two models

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图 6 两模型间对称轴处辐射剂量率的对比

Figure 6. Comparison of radiation dose rate at symmetry axis between two models

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表 1 烟尘50个颗粒群的粒径区间及中值粒径

Table 1. Range and median particle size of 50 particle groups of fallout

range of particle diameters/μm	median particle diameter d_m/μm	range of particle diameters/μm	median particle diameter d_m/μm	range of particle diameters/μm	median particle diameter d_m/μm
1～2.547	1.596	36.10～39.57	37.80	152.8～166.8	159.6
2.547～3.916	3.158	39.57～43.29	41.39	166.8～182.6	174.5
3.916～5.296	4.554	43.29～47.27	45.23	182.6～200.3	191.2
5.296～6.730	5.970	47.27～51.54	49.36	200.3～220.4	210.1
6.730～8.239	7.446	51.54～56.13	53.78	220.4～243.3	231.6
8.239～9.837	9.003	56.13～61.06	58.54	243.3～269.8	256.2
9.837～11.53	10.65	61.06～66.37	63.66	269.8～300.7	284.8
11.53～13.34	12.40	66.37～72.11	69.18	300.7～337.3	318.5
13.34～15.26	14.27	72.11～78.30	75.14	337.3～381.3	358.6
15.26～17.32	16.26	78.30～85.01	81.58	381.3～435.5	407.5
17.32～19.50	18.38	85.01～92.28	88.57	435.5～503.9	468.5
19.50～21.84	20.64	92.28～100.2	96.16	503.9～593.8	547.0
21.84～24.33	23.05	100.2～108.8	104.4	593.8～718.2	653.0
24.33～26.98	25.62	108.8～118.3	113.5	718.2～904.7	806.1
26.98～29.82	28.37	118.3～128.7	123.4	904.7～1227.0	1054.0
29.82～32.86	31.30	128.7～140.1	134.3	1227.0～2000.0	1567.0
32.86～36.10	34.44	140.1～152.8	146.3

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