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Radiation Protection Dosimetry 7:115-119 (1984)
© 1984 Oxford University Press

The Role of Daughter Product Plateout in Passive Radon Detection

J.P. McLaughlin and F.D. O'Byrne

In this work good agreement was found between the determined and predicted values of the sensitivity of radon exposure of cylindrically shaped passive radon dosemeters. Both the alpha track plastic CR-39 and surface barrier detectors were used to detect alpha activity from radon and its daughters. It was found that in almost all cases plateout activity contributed in excess of 60% of the recorded alpha count with plateout on the detector surface being the single largest contributor in this category. Measurements were also made in a small radon chamber on the plateout (deposition) velocity of unattached 218Po (RaA). This was achieved by measuring the alpha activity from unattached 218Po deposited on the detecting face of a surface barrier detector. A mean value of 0.04 cm.s-1 for the plateout velocity was obtained.


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