Abstract
An improved passive CR-39-based direct 222Rn/220Rn progeny detector with 3 detection channels was designed and tested in this study to measure and calculate equilibrium equivalent concentration (EEC) of both 222Rn and 220Rn without the equilibrium factor. A theoretical model was established to calculate the EEC with optimization. Subsequently, an exposure experiment was carried out to test the performance of this detector, and we compared the chamber experiment and the theoretical model by estimating and measuring various parameters. The deposition flux of progeny derived from the prediction agreed well with the value measured in the exposure chamber. The energy-weighted net track density (NTD) measured by this detector is much more reliable to reflect the linear relation between NTD and time-integrated EEC. Since the detector is sensitive to the exposure environmental condition, it is recommended to apply the detector to measure the EEC after its calibration in a typical indoor environment.
Highlights
In the conventional integrating measurements for 222 Rn and 220 Rn activity concentrations in a large-scale survey, the solid-state nuclear track detector (SSNTD) technique is usually used
We developed a passive CR-39-based direct 222 Rn/220 Rn progeny detector
The optimized deposition fluxes of 220 Rn progeny on the the Rn progeny (TnP) channel, the 222 Rn progeny on the RnPII channel, and 218 Po on the RnPI channel agreed well with the experimental measurements
Summary
In the conventional integrating measurements for 222 Rn and 220 Rn activity concentrations in a large-scale survey, the solid-state nuclear track detector (SSNTD) technique is usually used. In the two different diffusion rate chambers of these measuring devices, because there is a diffusion barrier against 220 Rn based on its quite short half-life, the low diffusion rate chamber detects mainly 222 Rn and the high diffusion rate chamber detects both. 222 Rn and 220 Rn. evaluation of the internal exposure to 222 Rn and 220 Rn does not directly use the activity concentration of 222 Rn and 220 Rn gas instead of the equilibrium equivalent concentration (EEC). It is not feasible to use the 220 Rn concentration directly measured by the integrating detectors to evaluate its internal exposure. The direct measurement technique of 222 Rn and 220 Rn progeny is desirable and necessary for the evaluation of internal indoor
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