The internal alpha dose assessment (ICRP 65, 1994) depends on the value of the equilibrium factor F. This parameter is general- ly not measured and a mean conventional value ranging between 0.4 and 0.6 is assumed, possibly leading to a significant bias in the dose assessments. In this paper, a method for the measurement of F is reported, based on the total aerosol sampling on filters and immediate gross beta counting of 214Pb and 214Bi activities. Measurements are interpreted according to a Raabe–Wrenn and Jacobi simplified room model, leading to an estimate of the individual airborne activities of short-lived radon daughters, the removal parameter and the equilibrium factor. The method was laboratory tested and validated and it is being qualified by field surveys in different indoor environmental conditions.

A simple approach to measure the radon equilibrium factor F from air filter gross beta counting

ARMAN, GIUSEPPINA MARIA;CACCIA, MASSIMO;CAVALLO, DOMENICO MARIA GUIDO;
2014-01-01

Abstract

The internal alpha dose assessment (ICRP 65, 1994) depends on the value of the equilibrium factor F. This parameter is general- ly not measured and a mean conventional value ranging between 0.4 and 0.6 is assumed, possibly leading to a significant bias in the dose assessments. In this paper, a method for the measurement of F is reported, based on the total aerosol sampling on filters and immediate gross beta counting of 214Pb and 214Bi activities. Measurements are interpreted according to a Raabe–Wrenn and Jacobi simplified room model, leading to an estimate of the individual airborne activities of short-lived radon daughters, the removal parameter and the equilibrium factor. The method was laboratory tested and validated and it is being qualified by field surveys in different indoor environmental conditions.
2014
Panero, L. M.; Arman, GIUSEPPINA MARIA; Caccia, Massimo; Cavallo, DOMENICO MARIA GUIDO; Chiaberto, E. M.; Chmill, V.; Faure Ragani, M.; Magnoni, M....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1966723
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