土壤中光子致地表光子辐射剂量率转换系数的EGS模拟

辐射防护通讯 ›› 2014, Vol. 34 ›› Issue (3): 16-19.

土壤中光子致地表光子辐射剂量率转换系数的EGS模拟

花正东¹, 洪韵², 眭光凯², 戴继伟²

1.上海市奉贤区环境监测站, 上海, 201400;
2.上海市辐射环境监督站, 上海, 200065

收稿日期:2013-11-23 出版日期:2014-06-20 发布日期:2025-02-26
作者简介:花正东(1984- ),男, 2005年毕业于南华大学核工程与核技术专业,学士; 工程师。

Calculation of Dose Rate Conversion Coefficients for External Exposure to Photon emitters in Soil Based on EGS Monte Carlo Code

Hua Zhengdong¹, Hong Yun², Sui Guangkai², Dai Jiwei²

1. Environmetnal Monitoring Station of Fengxian District, Shanghai, 201400;
2. Shanghai Radioenvironment Supervision Agency, Shanghai, 200065

Received:2013-11-23 Online:2014-06-20 Published:2025-02-26

摘要/Abstract

摘要： 基于镜像、积分原理,采用EGS蒙特卡罗程序对土壤中光子致地表光子辐射剂量率的转换系数进行了模拟计算,给出了能量50 keV～3 MeV光子的转换系数。与其他研究者的计算结果相比,除0.2、0.4 MeV两个能量点的值相对偏差较大(25%)外,其余均小于15%。依据该转换系数计算了土壤中单位比活度的天然放射性核素所致的地表光子辐射剂量率,与其他研究者计算结果的相对偏差小于10%。

关键词: 辐射剂量率, 土壤, 转换系数, EGS

Abstract: The conversion coefficients of photondose rate above ground from photon emitters in soil were calculated using the EGS Monte Carlo code. Calculations were performed for 16 photon energies from 50 keV to 3 MeV and for 30 plane radius from 5 cm to 200 m. The conversion of photondose rate above ground from specific activity of nuclides form ²³⁸U decay chain, ²³²Th decay chain and ⁴⁰K in soil were also given. The comparison between these results and the data deduced previously by otherauthors indicates a good agreement, less than 10% difference.

Key words: Photon dose rate, Soil, Conversion coefficient, EGS

中图分类号:

TL72,TL77

花正东, 洪韵, 眭光凯, 戴继伟. 土壤中光子致地表光子辐射剂量率转换系数的EGS模拟[J]. 辐射防护通讯, 2014, 34(3): 16-19.

Hua Zhengdong, Hong Yun, Sui Guangkai, Dai Jiwei. Calculation of Dose Rate Conversion Coefficients for External Exposure to Photon emitters in Soil Based on EGS Monte Carlo Code[J]. RADIATION PROTECTION BULLETIN, 2014, 34(3): 16-19.

参考文献 13

[1]	Bech H L, De Planque G. The Radiation Field in Air Due to Distributed Gamma Ray Sources in Ground. HASL-195, 1968.
[2]	Beck H L, De Campo J, Gogolak C. In Situ Ge(Li) and NaI(TI)Gamma-ray Spectrometry. HASL258, 1972.
[3]	Kocher D C, Sjoreen A L. Dose Rate Conversion Factors for External Exposure to Photon Emitters in Soil. Health Phys, 1985,48:193.
[4]	Chen S Y. Calculation of Effective Dose-equivalent Responses for External Exposure from Residual Photon Emitters in Soil. Health Phys. 1991,60:411.
[5]	Saito K, Jacob P. Gamma Ray Fields in the Air Due to Sources in the Ground. Radiation Protection Dosimetry, 1995,58(1):29.
[6]	Markkanen M. Radiation Dose Assessments for Materials withElevated Natural Radioactivity. STUK-B-STO 32, 1995.
[7]	Likar A, Vidmar T, Pucelj B. Monte Carlo Determination of Gamma-ray Dose Rate with the GEANT System. Health Phys. 1998,75:165.
[8]	Clouvas A, Xanthos S, Antonopoulos-Domis M, et al. Monte Carlo Calculation of Dose Rate Conversion Factors for External Exposure to PhotonEmitters in Soil. Health Phys. 2000,78:295.
[9]	Quindos L S, Fernández P L, Ródenas C, et al. ConversionFactors for External Gamma Dose Derived from Natural Radionuclides in Soils. Journal of Environmental Radioactivity, 2004,71:139.
[10]	Askri B, Manai K, Trabelsi A, et al. Optimised Geometry to Calculate Dose Rate Conversion Coefficient for External Exposure to Photons. RadiationProtection Dosimetry, 2008,128(3):279.
[11]	NRC. The EGSnrc Code System: Monte Carlo Simulation of Electron and Photon Transport. NRC Report PIRS-701, 2011.
[12]	Berger M J, Hubbell J H, Seltzer S M, et al. XCOM: Photon cross Sections Database. http://www.nist.gov/pml/data/xcom/index.cfm
[13]	Firestone R B, Ekström L P. Www Table of Radioactive Isotopes. http://ie.lbl.gov/toi/index.asp