Department of Physics, Federal University of Technology, Akure, Ondo State, Nigeria.
CITEUC Department or Earth Science, University of Coimbra, Coimbra, Portugal.
Environ Monit Assess. 2020 Nov 16;192(12):764. doi: 10.1007/s10661-020-08734-z.
Indoor radon (Rn) measurements were carried out using solid state nuclear track detectors (SSNTD) in some dwellings from southwestern Nigeria. This was aimed at statistically assessing influence of building characteristics on the measured radon and estimating excess lifetime cancer risks (ELCR). The measured radon concentrations followed lognormal distribution and were significantly influenced by some building properties. The arithmetic mean (1.60 mSv) of annual effective doses (AEDs) due to indoor radon was observed to be higher than the world average level (1.15 mSv) but less than lower limit (3 mSv) of International Commission on Radiological Protection (ICRP). The evaluated excess lifetime cancer risk ranged from 1.5 to 28.1 (MPy) with an average value of 6.3 (MPy), indicating that after exposure to indoor radon for 70 years, 6 people in every 1000 are likely to suffer the risk of developing lung cancer. Adequate ventilation systems were recommended for houses with high level of radon to avoid unnecessary exposure to radon. However, the investigated data would form important component of the database required to set up guidelines and policy of controlling radon at home.
在尼日利亚西南部的一些住宅中，使用固体核径迹探测器（SSNTD）进行了室内氡（Rn）测量。这旨在统计评估建筑物特性对测量氡的影响，并估算超额寿命癌症风险（ELCR）。测量的氡浓度遵循对数正态分布，并且受到一些建筑物特性的显著影响。观察到由于室内氡而导致的年有效剂量（AED）的算术平均值（1.60 mSv）高于世界平均水平（1.15 mSv），但低于国际辐射防护委员会（ICRP）的下限（3 mSv）。评估的超额寿命癌症风险范围为 1.5 至 28.1（MPy），平均值为 6.3（MPy），这表明在暴露于室内氡 70 年后，每 1000 人中可能有 6 人有患肺癌的风险。建议为氡含量高的房屋安装足够的通风系统，以避免不必要的氡暴露。然而，所调查的数据将成为在家中控制氡所需的数据库的重要组成部分。
