Simple, discriminative measurement technique for radon and thoron concentrations with a single scintillation cell

Abstract

A simple, discriminative measurement technique for radon and thoron concentrations is discussed. In this technique, a single scintillation cell is used for both radon and thoron measurements. It consists of two measurements that use the difference of the half life between the two isotopes. Alpha counting efficiencies for their associated radionuclides were estimated by a Monte Carlo calculation. When evaluating the conversion factor for concentration on two types of scintillation cells, both agreed well with experimental values. Optimum measurement conditions on the timetable are also discussed. This technique can provide two concentrations promptly. Although it is not highly sensitive, it is applicable to performance tests for radon/thoron monitors and simultaneous exhalation rate measurements for both radon and thoron.