Chen Jing, Harley Naomi H
Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa K1A 1C1, Canada.
New York University School of Medicine, 1 Marine View Plaza, Hoboken, NJ.
Health Phys. 2018 Oct;115(4):490-499. doi: 10.1097/HP.0000000000000909.
Radon exposure limits 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, the 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 20 countries, measured in indoor residential, indoor public, and outdoor environments. Values for Rn are reported and discussed here, 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 equilibrium factors suggests that location-specific values are more appropriate than a worldwide average value in the calculation of lung bronchial dose.
氡暴露限值是以空气中氡气浓度来给出的。然而，在计算肺部的氡剂量时，使用的是氡平衡当量浓度。所测平衡因子乘以所测氡气浓度即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值的综述表明，来自20多个国家的研究报告了在室内住宅、室内公共场所和室外环境中所测的一系列数值。本文报告并讨论了Rn的数值，特别关注了印度和中国的结果，在这两个国家，分别对数以百计和数以千计的家庭测量了平衡因子。平衡因子的广泛范围表明，在计算肺部支气管剂量时，特定地点的值比全球平均值更合适。
