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采用Monte-Carlo模拟和实验测量两种方法对30 cm~3和10cm~3球形石墨空腔电离室在~(?)Coγ射线下的壁修正因子K_(wall)进行研究。实验和模拟计算结果的比较表明,传统的线性外推法确定的壁修正因子比Monte-Carlo模拟计算结果约偏低1．0％。对美国国家标准技术研究所(NIST)国家空气比释动能基准组的30 cm~3和50 cm~3球彤石墨空腔电离室在~(60)Coγ射线下的相对电离电流和壁修正因子进行了Monte-Carlo模拟计算,计算的相对电离电流值与NIST发布的实验测量值在0．12％内吻合。
Monte Carlo simulation and experimental measurement were used to study the wall correction factor K_wall of ~ (?) Coγ-rays in a 30 cm ~ 3 and 10 cm ~ 3 spherical graphite chamber. Comparison of the experimental and simulation results shows that the wall correction factor determined by the traditional linear extrapolation method is about 1.0% lower than the Monte-Carlo simulation result. The relative ionization current and wall correction factor at ~ (60) Coγ-ray of 30 cm ~ 3 and 50 cm ~ 3 ball-shaped graphite chamber ionization chamber of National Institute of Standards and Technology (NIST) Monte-Carlo simulations were performed and the calculated relative ionization current values agree well with experimental values published by NIST within 0.12%.