Abstract
To measure the unattached fraction of radon progeny, a new type of portable, low cost,reusable integrating monitor with etched track detector (CR-39) was developed. This monitorsimultaneously gives the average equilibrium-equivalent concentrations of unattached 222Rn progeny (EECRnu), attached 222Rn progeny (EECRna) andalso 220Rn progeny (EECTn). It was calculated, according to the detection efficiencies which werederived by the Monte Carlo method, that the lower detection limits forEECRnu,EECRna andEECTn are 0.03 Bq m−3, 0.12 Bq m−3 and0.07 Bq m−3, respectively for 24 h integrating sampling at a flow rate of 2.92 l min−1. The validity of the new monitor was confirmed through a series of intercomparisonexperiments.
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