An Improved Correlated Sampling Method Calculating Correction Factor of Detector

WU Zhen; LI Jun-Li; CHENG Jian-Ping

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

Abstract
HTML
Reference
Related

PDF

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.

References

[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

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2005-11-21
Revised: 2005-12-21

Article Metric

Article Views(4972)
PDF Downloads(617)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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.