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

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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

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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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通讯作者: 陈斌, bchen63@163.com

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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.

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An Improved Correlated Sampling Method Calculating Correction Factor of Detector

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