Cresswell Alan J, Sanderson David C W, Yamaguchi Katsuhiko
Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan.
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK.
J Environ Radioact. 2018 Jan;181:70-77. doi: 10.1016/j.jenvrad.2017.10.019. Epub 2017 Nov 2.
A Monte Carlo simulation was used to develop a model of the response of a portable gamma spectrometry system in forest environments. This model was used to evaluate any corrections needed to measurements of Cs activity per unit area calibrated assuming an open field geometry. These were shown to be less than 20% for most forest environments. The model was also used to assess the impact of activity in the canopy on ground level measurements. For similar activity per unit area in the lower parts of the canopy as on the ground, 10-25% of the ground based measurement would be due to activity in the canopy, depending on the depth profile in the soil. The model verifies that an optional collimator cap can assess activity in the canopy by repeat survey.
使用蒙特卡罗模拟来建立便携式伽马能谱系统在森林环境中的响应模型。该模型用于评估在假设开阔场地几何形状的情况下，对每单位面积铯活度测量进行校准所需的任何校正。结果表明，在大多数森林环境中，这些校正小于20%。该模型还用于评估树冠层活度对地面测量的影响。对于树冠层下部与地面每单位面积活度相似的情况，根据土壤中的深度分布，地面测量值的10%-25%将归因于树冠层中的活度。该模型验证了一个可选的准直器帽可以通过重复测量来评估树冠层中的活度。
