Schmidt V, Hamel P
Federal Office for Radiation Protection, Department of Radiation Protection, Berlin, Germany.
Sci Total Environ. 2001 May 14;272(1-3):189-94. doi: 10.1016/s0048-9697(01)00691-x.
The retrospective determination of radon exposure levels in dwellings by means of the measurement of the Po-210 surface activity is subject to various uncertainties. These result partly from the values assumed for the equilibrium factor F and for the unattached fraction f(p), and, more importantly, from differences in the deposition velocities of short-lived decay products of Rn-222, caused by varying conditions of turbulence. In order to evaluate the actual range of the variation which occurs under German living conditions, measurements for the deposition velocity parameter were carried out in several dwellings in which increased levels of radon were present. The statistical evaluation of the measurements produced a mean deposition velocity of 1.7 m/h for Po-218 and 0.4 m/h for Pb-214, and a relative standard deviation in the measured values of as low as approximately 50%. This lay significantly below the uncertainty value expected from the literature and would seem to justify the retrospective determination of the radon exposure from Po-210 surface activity measurement for use in, for example, epidemiological studies.
通过测量钋 - 210表面活性来回顾性确定住宅中的氡暴露水平存在各种不确定性。这些不确定性部分源于为平衡因子F和未附着部分f(p)所假定的值，更重要的是，由于湍流条件的变化，导致氡 - 222短寿命衰变产物的沉积速度存在差异。为了评估在德国居住条件下实际发生的变化范围，在几处氡含量较高的住宅中对沉积速度参数进行了测量。测量的统计评估得出钋 - 218的平均沉积速度为1.7米/小时，铅 - 214的平均沉积速度为0.4米/小时，测量值的相对标准偏差低至约50%。这明显低于文献预期的不确定值，似乎证明了通过测量钋 - 210表面活性来回顾性确定氡暴露水平可用于例如流行病学研究。
