Eagle River, MI.
Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA.
Health Phys. 2019 May;116(5):582-589. doi: 10.1097/HP.0000000000000970.
The temporal variations of the airborne radon decay product dose rate and deposited radon decay product activities, as well as the within-house and house-to-house variations of radon concentrations, were evaluated through repeated field measurements. Long-term average radon and surface-deposited radon decay product concentrations were measured in 76 rooms of 38 houses. Temporal variation of radon, as well as airborne and surface-deposited radon decay products, were measured in 11 of the 38 houses during two different seasons. Environmental factors that have the potential to influence airborne dose rate and deposited radon decay products were also studied. Airborne dose rates were calculated from the unattached and attached potential alpha energy concentrations using two dosimetric models. For one model, the observed dose variations were 103%, 74%, 58%, and 60% for the total, house-to-house, within-house, and within-room temporal variations, respectively. For the other model, the dose variations were 100%, 66%, 61%, and 46%, respectively. Surface-deposited Po showed variations of 79%, 57%, 42%, and 48%, respectively. These substantial radon decay product concentration variations suggest that multiple locations and time-integrated measurements are needed to make an accurate assessment of the chronic radon-related doses in homes. Smoking was the environmental factor that had the largest temporal and spatial effect on airborne radon decay product dose rates.
通过反复的现场测量，评估了空气中氡衰变产物剂量率和沉积氡衰变产物活度的时间变化，以及氡浓度的室内和房屋间变化。在 38 所房屋的 76 个房间中测量了长期平均氡和表面沉积氡衰变产物浓度。在两个不同季节，对 38 所房屋中的 11 所房屋中的氡以及空气中和表面沉积的氡衰变产物进行了时间变化测量。还研究了可能影响空气中剂量率和沉积氡衰变产物的环境因素。利用两种剂量计模型，从非附着和附着的潜在阿尔法能量浓度计算出空气中的剂量率。对于一个模型，总剂量、房屋间、室内和室内时间变化的观测剂量变化分别为 103%、74%、58%和 60%。对于另一个模型，剂量变化分别为 100%、66%、61%和 46%。表面沉积的 Po 分别变化了 79%、57%、42%和 48%。这些大量的氡衰变产物浓度变化表明，需要在多个位置和时间进行综合测量，以准确评估住宅内慢性与氡有关的剂量。吸烟是对空气中氡衰变产物剂量率产生最大时间和空间影响的环境因素。
