Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Delegacion Coyoacan, 04520 México, D.F., México.
J Environ Radioact. 2010 May;101(5):333-7. doi: 10.1016/j.jenvrad.2010.01.003. Epub 2010 Mar 4.
The functioning of radon diffusion chambers was studied using the Monte Carlo code RAMMX developed here. The alpha particles from radon are assumed randomly produced in the volume of the cylinder, and those from the progeny are assumed to originate randomly at the cylindrical surface. The energy spectrum, the distribution of incident angles, and the distribution of path lengths of the alpha particles on the detector were obtained. These quantities vary depending on input parameters such as initial alpha particle energy, radius and depth of the diffusion chamber, detector size and atmospheric pressure. The calculated energy spectrum for both (222)Rn and (220)Rn was compared with experiment, permitting the identification of each peak and its origin, and a better understanding of radon monitoring. Three aspects not considered in previous calculations are progeny alphas coming from surfaces of the monitor, taking into account the atmospheric pressure, and including the isotope (220)Rn.
使用这里开发的蒙特卡罗代码 RAMMX 研究了氡扩散室的功能。假设氡的α粒子随机产生在圆柱体的体积内，而其后代的α粒子则假设随机起源于圆柱体表面。获得了探测器上α粒子的能量谱、入射角分布和路径长度分布。这些量取决于输入参数，如初始α粒子能量、扩散室的半径和深度、探测器尺寸和大气压力。对 (222)Rn 和 (220)Rn 的计算能谱与实验进行了比较，允许识别每个峰及其起源，并更好地了解氡监测。在以前的计算中没有考虑三个方面：来自监测器表面的后代α粒子，考虑大气压力，并包括同位素 (220)Rn。
