Abstract
A pilot survey on indoor radon and thoron progeny concentration was carried out in five villages in HBRA of Yangjiang and one village in the controlled area(CA) in March 2004. Totally 26 adobe houses and 29 brick houses in HBRA were investigated. A portable 24-h integrating monitor with CR-39 detectors was adopted for progeny measurements, and the average equilibrium equivalent 222Rn and 220Rn concentrations (EEC Rn and EEC Tn) were obtained. Rather high levels of EEC Rn and EEC Tn with an average of 57.1±33.3 and 12.6±9.5 Bq·m −3, respectively, were observed in adobe houses. In addition, 222Rn/ 220Rn concentrations and exhalation rate were also measured by an Electrostatic-Radon-Sampler (ERS-2) monitor.
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