Van Der Vooren A W, Busigin A, Phillips C R
Health Phys. 1982 Jun;42(6):801-8. doi: 10.1097/00004032-198206000-00005.
The collection efficiencies of parallel plate, inertial impactor and wire screen devices reported in the literature for measurement of the unattached fraction of radon (or thoron) daughters are calculated for collection of the attached fraction of the aerosol, using real uranium mine aerosol activity-size distributions. The attached activity collection efficiencies may be as much as 4.3%, which, given the typically low values of the unattached fraction (a few per cent), results in a very substantial error in the measurement of the latter. Published unattached fraction measurements in the environment may therefore be high and should be interpreted with care.
利用真实铀矿气溶胶的活度粒径分布，针对文献中报道的用于测量氡（或钍射气）子体未附着部分的平行板、惯性撞击器和金属丝网装置，计算了它们收集气溶胶附着部分的收集效率。附着活度的收集效率可能高达4.3%，鉴于未附着部分的值通常较低（百分之几），这会导致在测量未附着部分时产生非常大的误差。因此，环境中已发表的未附着部分测量值可能偏高，应谨慎解读。
