AN EXPERIMENTAL STUDY OF THE BEHAVIOUR AND DETECTION OF HAZARDOUS RADON RELEASES IN AIR

摘要

A series of experiments are described- involving airborne concentrations of Rn-222 up to 10-4 μc/cm3 . The response of a variety of standard health physics instruments to the a and β/γ emissions from the Rn-222 and its daughter products has been evaluated. An assessment has been made of the physical form of the airborne daughter products. Free-ion fractions of RaA have been found which suggest that the maximum permissible exposure to Rn-222 and its daughter products, under accident conditions, should be reduced from 6 x 10 -5 to 6 x 10 -6 μc-hrs/cm3. Effective deposition velocities have been evaluated separately for free-ion RaA and for particulate-carried daughters.