Monte Carlo Method for Calculating the Skyshine of Electron Accelerator Shielding Room

  • Using the Monte Carlo code MCNP4B, skyshine of 9MeV electron linear accelerator was calculated with a multi-step method combining the split and roulette variance reduction technique. Dose distribution of the skyshine was measured around the accelerator room. Results of the Monte Carlo simulation, empirical formulas and dosimetric measurement were compared and analyzed. In conclusion, the dosimetric measurement agrees with the results computed by Monte Carlo method reasonably, but deviates with computational results from empirical formulas. It shows that Monte Carlo method is a good way to analyze skyshine.
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  • [1] . NCRP. NCRP REPORT No. 51. Washington: Pergamon Press, 1977.68 ) 1102.WU Jing-Min, SUN Yue. HEP NP, 1995, 19( 4) : 377) 384 ( in Chinese)(吴靖民, 孙岳. 高能物理与核物理, 1995, 19( 4) : 377 ) 384)3.HORI M et al. Calculation of Dose for Skyshine Radiation froma45MeV Electron Linac. In: Hirayama H, Namito Y, Ban S.Proceedings of the Sixth EGS4 User. Meeting in Japan. Japan: National Laboratory for High Energy Physics, 1996. 113 ) 1214.SHI Gong, ZHONG Zhao-Peng, HU Yong-Ming. J. Tsinghua Univ.(Sci . Tech. ) , 2001, 41( 6) : 19) 22( in Chinese)(施工, 钟兆鹏, 胡永明. 清华大学学报( 自然科学版) , 2001,41( 6) : 19 ) 22)5.YU Wei-Dong, YUE Ai-Zhong, ZHONG Zhen-Qian et al. WLT, 2000,24( 5) : 368 ) 371( in Chinese)( 余卫东, 岳爱忠, 钟振千等. 测井技术, 2000, 24(5) : 368 ) 371)6.PEI Lu-Cheng, ZHANG Xiao-Ze. Monte Carlo Method and Applicat ionin Part icle Transport Problem. Beijing: Science Press, 1980. 204 )206, 342 ) 352( in Chinese)( 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. 北京: 科学出版社, 1980. 204) 206, 342) 352)7.Briesmeist er Judith F. MCNP ) ) ) A General Monte Carlo N-ParticleTransport Code. Oak Ridge, U. S. : RSICC, 1997. 12122114222 1438.Notea A. Skyshine from Megavots Radiography Facilities. In: VarianAssociates Lnc. NCRP Recommendation Against Benchmark Experiment , U.S. , 19849.LI Xing-Hong, SUN Jian-Yong. Nuclear Techniques, 1999, 22( 4 ) :247 ) 252( in Chinese)( 李星洪, 孙建永. 核技术, 1999, 22( 4) : 247 ) 252)10.Nason R R, Shult is J K, Faw R E. Nuclear Science and Engineering,1981, 79: 404 ) 416
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KONG Chao-Cheng, LI Quan-Feng, DU Tai-Bin, CHENG Cheng, CHEN Huai-Bi, TANG Chuan-Xiang, ZHU Li, PEI Zhi-Gang, MING Shen-Jin and ZHANG Hui. Monte Carlo Method for Calculating the Skyshine of Electron Accelerator Shielding Room[J]. Chinese Physics C, 2004, 28(4): 431-436.
KONG Chao-Cheng, LI Quan-Feng, DU Tai-Bin, CHENG Cheng, CHEN Huai-Bi, TANG Chuan-Xiang, ZHU Li, PEI Zhi-Gang, MING Shen-Jin and ZHANG Hui. Monte Carlo Method for Calculating the Skyshine of Electron Accelerator Shielding Room[J]. Chinese Physics C, 2004, 28(4): 431-436. shu
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Received: 2003-07-21
Revised: 1900-01-01
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Monte Carlo Method for Calculating the Skyshine of Electron Accelerator Shielding Room

    Corresponding author: KONG Chao-Cheng,
  • Department of Engineering Physics,Tsinghua University,Beijing 100084,China2 Laboratory of Radiation Protection and Environmental Protection,Tsinghua University,Beijing 100084,China

Abstract: Using the Monte Carlo code MCNP4B, skyshine of 9MeV electron linear accelerator was calculated with a multi-step method combining the split and roulette variance reduction technique. Dose distribution of the skyshine was measured around the accelerator room. Results of the Monte Carlo simulation, empirical formulas and dosimetric measurement were compared and analyzed. In conclusion, the dosimetric measurement agrees with the results computed by Monte Carlo method reasonably, but deviates with computational results from empirical formulas. It shows that Monte Carlo method is a good way to analyze skyshine.

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