Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
Int J Environ Res Public Health. 2020 Aug 5;17(16):5660. doi: 10.3390/ijerph17165660.
The International Commission on Radiological Protection (ICRP) recently recommended a new dose conversion factor for radon based on the latest epidemiological studies and dosimetric model. It is important to evaluate an inhalation dose from radon and its progeny. In the present study, a passive radon personal monitor was designed using a small container for storing contact lenses and its performance was evaluated. The conversion factor for radon (Rn), the effect of thoron (Rn) concentration and the air exchange rate were evaluated using the calibration chamber at Hirosaki University. The minimum and maximum detectable radon concentrations were calculated. The conversion factor was evaluated as 2.0 ± 0.3 tracks cm per kBq h m; statistical analyses of results showed no significant effect from thoron concentration. The minimum and maximum detectable radon concentrations were 92 Bq m and 231 kBq m for a measurement period of three months, respectively. The air exchange rate was estimated to be 0.26 ± 0.16 h, whose effect on the measured time-integrated radon concentration was small. These results indicate that the monitor could be used as a wearable monitor for radon measurements, especially in places where radon concentrations may be relatively high, such as mines and caves.
国际放射防护委员会（ICRP）最近根据最新的流行病学研究和剂量学模型，推荐了一种基于新的氡剂量转换因子。评估氡及其子体的吸入剂量很重要。在本研究中，设计了一种使用小容器储存隐形眼镜的被动式氡个人监测仪，并对其性能进行了评估。在弘前大学的校准室中，评估了氡（Rn）的转换因子、钍（Rn）浓度和空气交换率的影响。计算了最小和最大可检测氡浓度。转换因子的评估结果为 2.0 ± 0.3 条 cm 每 kBq h m；结果的统计分析表明，钍浓度没有显著影响。对于三个月的测量期，最小和最大可检测氡浓度分别为 92 Bq m 和 231 kBq m。空气交换率估计为 0.26 ± 0.16 h，其对测量的时间积分氡浓度的影响很小。这些结果表明，该监测仪可用作氡测量的可穿戴监测仪，特别是在氡浓度可能相对较高的地方，如矿山和洞穴。
