Abstract
The optimum radon measurement conditions for a kind of passive radon dosimeter containing CR-39 detector with large effective area were studied in detail. The optimum etching conditions were experimentally determined to be 6.25 mol L−1 NaOH solution at 75 °C for 6 h and the calibration factor was 1.1 ± 0.1 track cm−2/kBq m−3 h. Based on these parameters, these CR-39 detectors were used to measure radon concentration in China Jinping Underground Laboratory (CJPL). The measured results showed that radon concentrations in CJPL-I were lower than many other international underground laboratories.
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