Environmental & Radiation Health Branch, Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Yallambie, Victoria, Australia.
J Environ Radioact. 2011 Oct;102(10):901-5. doi: 10.1016/j.jenvrad.2010.09.008. Epub 2010 Oct 27.
An energy discriminate CR-39(®) nuclear track etch dosimeter for use in a (220)Rn and (222)Rn gas monitor has been developed and experimentally assessed. It utilises a thin film of Mylar(®) C to attenuate the alpha particle energies to allow only the damage tracks created by the 8.785 MeV alpha particles emitted from (212)Po of the (232)Th decay chain to be registered in the CR-39(®) plaque, allowing for the direct measurement of (220)Rn gas concentrations. The dosimeter was developed through a combination of experimental investigations and theoretical simulations using the Monte Carlo ion transport modelling program Stopping and Range of Ions in Materials (SRIM 2008). A film thickness of 54 μm has been shown to attenuate all alpha energies less then 7.7 MeV.
一种用于 (220)Rn 和 (222)Rn 气体监测仪的能量甄别 CR-39(®)核径迹蚀刻剂量计已经开发出来并进行了实验评估。它利用一层 Mylar(®) C 薄膜来衰减 α 粒子能量，只允许由 (232)Th 衰变链中的 (212)Po 发射的 8.785 MeV α 粒子所产生的损伤轨迹在 CR-39(®)薄片上记录，从而可以直接测量 (220)Rn 气体浓度。该剂量计是通过实验研究和使用蒙特卡罗离子输运建模程序 Stopping and Range of Ions in Materials (SRIM 2008) 的理论模拟相结合开发的。已经表明，54 μm 的薄膜厚度可以衰减所有小于 7.7 MeV 的 α 能量。
