Effect of medium size on the &gamma;-ray buildup factor for energy absorption in water

LI Hua; ZHAO Yuan; LIU Liye; XIAO Yunshi; LI Junli

doi:10.16511/j.cnki.qhdxxb.2017.22.032

PDF(1670 KB)

Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (5) : 525-529. DOI: 10.16511/j.cnki.qhdxxb.2017.22.032

ENGINEERING PHYSICS

Effect of medium size on the γ-ray buildup factor for energy absorption in water

{{article.zuoZhe_EN}}

Author information +

History +

Abstract

γ-Ray buildup factors calculated using an infinite medium model can differ greatly for actual finite models. The precision of the buildup factors used in the actual calculations is improved using Monte Carlo simulations to study the variation of the energy absorption buildup factors as a function of the medium size for water using a cylindrical model. The results show that as the cylinder radius increases, the buildup factors in water first increase up to a maximum. The corresponding radius values for the maximum buildup factors are not influenced by the γ-ray energy or the medium thickness, but are only related to the distance from the point source to the measured point on the medium surface. The differences between the buildup factors as the cylinder radius increases are larger than for the maximums, and the variation is linear for some mean free paths. As the medium thickness increases, the corresponding range of the mean free paths where the variation is linear also increases. This work provides a reference for analyzing calculational errors in shielding designs.

Key words

radiation protection / buildup factor / medium size / influence factors

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Hua, ZHAO Yuan, LIU Liye, XIAO Yunshi, LI Junli. Effect of medium size on the γ-ray buildup factor for energy absorption in water[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(5): 525-529 https://doi.org/10.16511/j.cnki.qhdxxb.2017.22.032

References

[1] 李星洪. 辐射防护基础[M]. 北京: 原子能出版社, 1982.LI Xinghong. Radiation Protection Foundation [M]. Beijing: Atomic Energy Press, 1982. (in Chinese) [2] 中国科学院工程力学研究所. γ射线屏蔽参考手册[M]. 北京: 原子能出版社, 1976.Institute of Mechanics, Chinese Academy of Sciences. Gamma-Ray Shielding Reference Manual [M]. Beijing: Atomic Energy Press, 1976. (in Chinese) [3] 刘立坡, 刘义保, 王娟. 积累因子影响因素的蒙特卡罗模拟[J]. 辐射防护, 2008, 28(2): 108-111.LIU Lipo, LIU Yibao, WANG Juan. Monte Carlo simulation of corrected value of buildup factor [J]. Radiation Protection, 2008, 28(2): 108-111. (in Chinese) [4] 张雷, 赵兵, 王学新. 蒙特卡罗程序EGS4在γ照射量积累因子计算中的应用[J]. 辐射防护, 2011, 31(2): 88-93.ZHANG Lei, ZHAO Bing, WANG Xuexin. Application of Monte Carlo code EGS4 to calculate gamma exposure buildup factors [J]. Radiation Protection, 2011, 31(2): 88-93.(in Chinese) [5] ANSI/ANS-6.4.3-1991. American National Standard for Gamma-Ray Attenuation Coefficients and Buildup Factors for Engineering Materials [S]. La Grange Park, IL: American Nuclear Society, 1991. [6] Singh V P, Badiger N M. Comprehensive study on energy absorption buildup factors and exposure buildup factors for photon energy 0.015 to 15 MeV up to 40 mfp penetration depth for gel dosimeters [J]. Radiation Physics and Chemistry, 2014, 103: 234-242. [7] Singh V P, Badiger N M. Energy absorption buildup factors, exposure buildup factors and Kerma for optically stimulated luminescence materials and their tissue equivalence for radiation dosimetry [J]. Radiation Physics and Chemistry, 2014, 104: 61-67. [8] Sharaf J M, Saleh H. Gamma-ray energy buildup factor calculations and shielding effects of some Jordanian building structures [J]. Radiation Physics and Chemistry, 2015, 110: 87-95. [9] Alkhatib S F, Park C J, Jeong H Y, et al. Layer-splitting technique for testing the recursive scheme for multilayer shields gamma ray buildup factors [J]. Annals of Nuclear Energy, 2016, 88: 24-29. [10] Briesmeister J F. MCNPTM: A General Monte Carlo N-Particle Transport Code [M]. Los Alamos, NM: Los Alamos National Laboratory, 2010. [11] 许淑艳. 蒙特卡罗方法在实验核物理中的应用 [M]. 北京: 原子能出版社, 2006.XU Shuyan. Application of Monte Carlo Method in Nuclear Physics Experiment [M]. Beijing: Atomic Energy Press, 2006. (in Chinese) [12] 裴鹿成, 张孝泽. 蒙特卡罗方法及其在粒子输运问题中的应用 [M]. 北京: 科学出版社, 1980.PEI Lucheng, ZHANG Xiaoze. Monte Carlo Method and Its Application in Particle Transport [M]. Beijing: Science Press, 1980. (in Chinese) [13] Luis D. Update to ANSI/ANS-6.4.3-1991 for Low-Z and Compound Materials and Review of Particle Transport Theory [D]. Las Vegas, NV: University of Nevada-Las Vegas, 2009.