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Chinese Physics C> 2006, Vol. 30> Issue(8) : 771-775 

An Improved Correlated Sampling Method Calculating Correction Factor of Detector

  •  Department of Engineering Physics, Tsinghua University, Beijing 100084, China

  • In the case of a small size detector lying inside a bulk of medium, there are two problems in the correction factors calculation of the detectors. One is that the detector is too small for the particles to arrive at and collide in; the other is that the ratio of two quantities is not accurate enough. The method discussed in this paper, which combines correlated sampling with modified particle collision auto-importance sampling, and has been realized on the MCNP-4C platform, can solve these two problems. Besides, other 3 variance reduction techniques are also combined with correlated sampling respectively to calculate a simple calculating model of the correction factors of detectors. The results prove that, although all the variance reduction techniques combined with correlated sampling can improve the calculating efficiency, the method combining the modified particle collision auto-importance sampling with the correlated sampling is the most efficient one.
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    [1] . PEI Lu-Cheng, ZHANG Xiao-Ze. Monte Carlo Methodand the Application in Particle Transport. Beijing: Science Press, 1980. 197-200(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,1980.197—200)2. MA Chang-Ming, Nahum A E. Medical Physics, 1993,20(4): 1189-11993. Buckley L A, Kawrakow I, Rogers DWO. Medical Physics,2004, 31(12): 3425-34354. FAN Jia-Jin, LI Jun-Li et al. Science in China(Series E),2003, 46(3): 271-277(in Chinese)(范佳锦,李君利等.中国科学(E辑),2003,33(5):452—458)5. FAN Jia-Jin. Research of Rare But Important Events Simulation in Monte Carlo Methods. Beijing: Department of Physics Engineering, Tsinghua University, 2004. 55-58(inChinese)(范佳锦.解小概率大贡献问题的蒙特卡罗方法研究.北京：清华大学工程物理系,2004.55—58)6. Bielajew A F. Physics in Medicine and Biology, 35(4):501-5167. Hedtjarn H, Carlsson G, Williamson J F. Physics inMedicine and Biology, 2002, 47(3): 351-3768. Briesmeister J F. MCNPTM-A general Monte Carlo N-particle transport code (Version 4C): LA-13709-M-Manual.USA: Los Alamos Laboratory, 2000. 2150-2158

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WU Zhen, LI Jun-Li and CHENG Jian-Ping. An Improved Correlated Sampling Method Calculating Correction Factor of Detector[J]. Chinese Physics C, 2006, 30(8): 771-775.
WU Zhen, LI Jun-Li and CHENG Jian-Ping. An Improved Correlated Sampling Method Calculating Correction Factor of Detector[J]. Chinese Physics C, 2006, 30(8): 771-775. shu
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Received: 2005-11-21
Revised: 2005-12-21
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An Improved Correlated Sampling Method Calculating Correction Factor of Detector

    Corresponding author: WU Zhen,
  • Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • Received Date: 2005-11-21
  • Accepted Date: 2005-12-21
  • Available Online: 2006-08-05

Abstract: In the case of a small size detector lying inside a bulk of medium, there are two problems in the correction factors calculation of the detectors. One is that the detector is too small for the particles to arrive at and collide in; the other is that the ratio of two quantities is not accurate enough. The method discussed in this paper, which combines correlated sampling with modified particle collision auto-importance sampling, and has been realized on the MCNP-4C platform, can solve these two problems. Besides, other 3 variance reduction techniques are also combined with correlated sampling respectively to calculate a simple calculating model of the correction factors of detectors. The results prove that, although all the variance reduction techniques combined with correlated sampling can improve the calculating efficiency, the method combining the modified particle collision auto-importance sampling with the correlated sampling is the most efficient one.

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