Irlinger J, Trinkl S, Wielunksi M, Tschiersch J, Rühm W
Helmholtz Zentrum München, Institute of Radiation Protection, Ingolstädter Landstraße 1, 85764 Oberschleißheim, Germany.
Technische Universität München, Physik-Department, 85748 Garching, Germany.
J Environ Radioact. 2016 Jul;158-159:64-70. doi: 10.1016/j.jenvrad.2016.03.025. Epub 2016 Apr 10.
A new electronic radon/thoron monitor employing semiconductor detectors based on a passive diffusion chamber design has been recently developed at the Helmholtz Zentrum München (HMGU). This device allows for acquisition of alpha particle energy spectra, in order to distinguish alpha particles originating from radon and radon progeny decays, as well as those originating from thoron and its progeny decays. A Monte-Carlo application is described which uses the Geant4 toolkit to simulate these alpha particle spectra. Reasonable agreement between measured and simulated spectra were obtained for both (220)Rn and (222)Rn, in the energy range between 1 and 10 MeV. Measured calibration factors could be reproduced by the simulation, given the uncertainties involved in the measurement and simulation. The simulated alpha particle spectra can now be used to interpret spectra measured in mixed radon/thoron atmospheres. The results agreed well with measurements performed in both radon and thoron gas environments. It is concluded that the developed simulation allows for an accurate prediction of calibration factors and alpha particle energy spectra.
慕尼黑亥姆霍兹中心（HMGU）最近开发了一种基于被动扩散室设计、采用半导体探测器的新型电子氡/钍射气监测仪。该设备能够获取α粒子能谱，以便区分源自氡及其子体衰变的α粒子，以及源自钍射气及其子体衰变的α粒子。本文描述了一个使用Geant4工具包来模拟这些α粒子能谱的蒙特卡罗应用。在1至10 MeV的能量范围内，对于（220）Rn和（222）Rn，测量谱与模拟谱都取得了合理的一致性。考虑到测量和模拟中涉及的不确定性，模拟能够再现测量得到的校准因子。现在，模拟的α粒子能谱可用于解释在氡/钍射气混合大气中测量的能谱。结果与在氡气和钍射气气体环境中进行的测量结果吻合良好。得出的结论是，所开发的模拟能够准确预测校准因子和α粒子能谱。
