Monte Carlo simulation of the exposure factor

• 来源期刊: 中国物理B（英文版）
• 关键词: exposure factor Geant4 Monte Carlo simulation free-air ionization chamber
• 年，卷（期）: 2009,（6）
• 页码范围: 2217-2222
• 页数: 6页
• 语种: 英文

摘要

In this paper, we simulate the exposure factor by a simple model of a free-air ionization chamber with the Monte Carlo programme Geant4. Special emphasis is placed on the discussion of the exposure factor related to parameters of the chamber model. The reason for the variation in exposure factor with incident ray energy is also analysed in terms of reaction cross section for different types of reactions. The obtained results indicate that our simulation is accurate in the calculation of the exposure factor and can serve as a reference in designing air ionization chambers.