Chen Jing, Harley Naomi H
Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa K1A 1C1, Canada.
New York University School of Medicine, 550 First Avenue, New York, NY 10016.
Health Phys. 2018 Oct;115(4):500-506. doi: 10.1097/HP.0000000000000910.
Radon exposure levels are given in terms of radon gas concentration in the air. However, in the calculation of radon dose to the lung, the radon equilibrium equivalent concentration is used. The measured equilibrium factor times the measured radon gas concentration estimates the equilibrium equivalent concentration. Therefore, equilibrium factor is an important factor in radon dose calculations. A review of published measurements of equilibrium factors shows a range of values reported in studies from more than 13 countries and regions measured in indoor residential, indoor public, and outdoor environments. Values for Rn are reported and discussed here as the second of a two-part series, with special attention paid to results from India and China, where measured equilibrium factors are reported for hundreds and thousands of households, respectively. The wide range of measured equilibrium factors suggests that location-specific values measured in the typical breathing zone are more appropriate than a worldwide average value in the calculation of lung bronchial dose.
氡暴露水平以空气中氡气浓度来表示。然而，在计算肺部的氡剂量时，使用的是氡平衡当量浓度。测量得到的平衡因子乘以测量得到的氡气浓度可估算出平衡当量浓度。因此，平衡因子是氡剂量计算中的一个重要因素。对已发表的平衡因子测量结果的综述表明，在13个以上国家和地区针对室内住宅、室内公共场所及室外环境进行的研究报告了一系列数值。本文作为两部分系列文章的第二篇，报告并讨论了氡的数值，特别关注了印度和中国的结果，在这两个国家分别针对成百上千户家庭测量了平衡因子。所测平衡因子的广泛范围表明，在计算肺部支气管剂量时，在典型呼吸区域测量的特定地点数值比全球平均值更为合适。
