Musavi Nasab Mohammad, Negarestani Ali
Department of Physics, Kerman Branch, Islamic Azad University, Kerman, Islamic Republic of Iran.
Kerman Graduate University of Technology, P.O. Box: 76315-117, Kerman, Islamic Republic of Iran.
Appl Radiat Isot. 2017 Jul;125:4-8. doi: 10.1016/j.apradiso.2017.03.022. Epub 2017 Mar 29.
A model based on electric circuit theory has been developed to simulate the radon concentration in an accumulator chamber from the soil surface. This model simulates the radon generation on earth as a voltage source, diffusion to the earth's surface as an electrical conductor, the convection flux of radon as an electrical current source and radon concentration in a chamber as a voltage across a capacitor. We use this model for processing the spike like an anomaly of radon. This paper offers a radon anomaly spike like has a duration time less than several hours. It is shown that the time constant of a general setup is very large with compare the duration time of a spike like anomaly. In this condition the actual shape of radon flux in earth is different from radon measuring concentration in the chamber. With regard to this model it is shown that the rise time of measured radon concentration must be equal the duration time of a spike like anomaly and the fall time must have a constant time equal the five times of constant time of our setup and it is independent of the shape of the anomaly.
已开发出一种基于电路理论的模型，用于模拟从土壤表面到蓄气室中的氡浓度。该模型将地球上的氡生成模拟为电压源，氡向地球表面的扩散模拟为电导体，氡的对流通量模拟为电流源，蓄气室中的氡浓度模拟为电容器两端的电压。我们使用该模型来处理类似氡异常的尖峰信号。本文提出类似氡异常的尖峰信号持续时间小于数小时。结果表明，与类似尖峰异常的持续时间相比，一般装置的时间常数非常大。在这种情况下，地球中氡通量的实际形状与蓄气室中氡测量浓度不同。关于该模型，结果表明，测量的氡浓度的上升时间必须等于类似尖峰异常的持续时间，下降时间必须有一个恒定时间，等于我们装置恒定时间的五倍，且与异常形状无关。
