Tokonami Shinji, Hosoda Masahiro, Joseph Emmanuel Ndjana Nkoulou Ii, Akata Naofumi, Flore Tchuente Siaka Yvette, Modibo Oumar Bobbo, Samuel Bineng Guillaume, Didier Takoukam Soh Serge
Institute of Radiation Emergency Medicine, Hirosaki University, Japan.
Graduate School of Health Sciences, Hirosaki University, Japan.
Radiat Prot Dosimetry. 2019 Oct 1;184(3-4):391-396. doi: 10.1093/rpd/ncz176.
Within the framework of a joint research project on natural radiation exposure and its health effects in Cameroon from 2014 to 2017, the Institute of Geological and Mining Research and the Hirosaki University worked together to carry out natural radiation survey in mining and ore bearing regions of Cameroon. Air kerma rates were measured using car-borne survey method. In-situ gamma spectrometry was used to determine activity concentrations of 238U, 232Th and 40K in soil. A total of 450 RADUET detectors and 350 thoron progeny monitors were deployed in dwellings of the study areas for 2-3 months, collected and analysed. Although natural radioactivity level seems to be normal in most of the surveyed areas, there are many points where activity concentrations of natural radionuclides are largely above the world average values. Indoor radon, thoron and thoron progeny results show the importance to put in place the national radon plan in Cameroon. It was also pointed out that thoron cannot be neglected when assessing inhalation dose.
在2014年至2017年关于喀麦隆自然辐射暴露及其健康影响的联合研究项目框架内，地质与矿业研究所和弘前大学共同合作，在喀麦隆的采矿和含矿地区开展自然辐射调查。采用车载测量方法测量空气比释动能率。利用现场γ能谱法测定土壤中238U、232Th和40K的活度浓度。在研究区域的住宅中总共部署了450个RADUET探测器和350个钍射气子体监测仪，为期2至3个月，之后进行收集和分析。虽然在大多数被调查地区自然放射性水平似乎正常，但有许多点的天然放射性核素活度浓度大大高于世界平均值。室内氡、钍射气和钍射气子体的结果表明，喀麦隆制定国家氡计划非常重要。研究还指出，在评估吸入剂量时，钍射气不能被忽视。
