Radiation Protection Dosimetry 7:337-340 (1984)
© 1984 Oxford University Press
Exposure of the Population to Radon Daughters - Problems Associated with the Assessment of the Annual Dose
A large national survey is presently being carried out in the Federal Republic of Germany in order to determine the current distribution of radon levels in houses. Since radon varies with time and place it is very difficult to collect representative data with grab sampling techniques. For the purpose of long term measurements at numerous locations this survey employs passive time-integrating dosemeters based on nuclear track detection. To derive an annual dose distribution for the population from these measurements, certain problems are involved, some of which are discussed and illustrated by particular measurements including temporal and spatial variation of radon levles, radon daughter equilibrium, occupancy factors and dosimetric aspects. Consequently it seems quite reasonable to assume an equilibrium factor of about 0.3 to 0.4 and indoor occupancy 70% to 80%. Although there is great variability in the dose conversion factor we refer to the value proposed by UNSCEAR. Based on measurements in 4512 homes, a median radon level of about 42 Bq.m-3 will lead to an annual effective dose equivalent of 0.7 to 1.0 mSv.
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