Chitkara University School of Engineering and Technology, Chitkara University, Solan, Himachal Pradesh 174103, India.
Retired from German Federal Office of Radiation Protection, Berlin, Germany.
J Environ Radioact. 2023 Nov;268-269:107262. doi: 10.1016/j.jenvrad.2023.107262. Epub 2023 Aug 3.
Humans receive a significant portion (˃50%) of the total dose attributed to all the natural radiation sources from indoor radon (Rn), thoron (Rn), and their progeny. While progeny contributes an overwhelming part to the dose, in most surveys, only radon gas is measured because of the simplicity of measurement. Progeny concentration is usually estimated by multiplying gas concentration with an assumed factor, called the equilibrium factor, and taken from literature. Recently, results of the measurements of equilibrium factors for Rn and Rn were reported from various parts of the globe. In India, many such studies have been conducted in the current decade. The studies show a wide variation of equilibrium factors which suggests that they depend on environmental factors and measurement conditions. Therefore, they should be determined site specifically if accurate site-specific dose estimation is targeted. This paper summarizes concepts, definitions, and methods to determine equilibrium factors and reviews literature about reported equilibrium factors worldwide, focusing on data reported from India.
人类从室内氡（Rn）、钍（Rn）及其子体中获得的总辐射剂量的相当大一部分（>50%）。虽然子体对子体的贡献很大，但在大多数调查中，由于测量的简单性，仅测量氡气。子体浓度通常通过将气体浓度乘以一个假定因子（称为平衡因子）并从文献中得出来估计。最近，来自全球不同地区的 Rn 和 Rn 平衡因子测量结果报告。在印度，本十年进行了许多此类研究。这些研究表明平衡因子的变化很大，这表明它们取决于环境因素和测量条件。因此，如果目标是进行准确的现场特定剂量估算，则应具体现场确定。本文总结了确定平衡因子的概念、定义和方法，并回顾了全球范围内关于报告的平衡因子的文献，重点介绍了来自印度的数据。
