Study on rapid radon determination method based on small scintillation chamber

The scintillation chamber with high detection efficiency is the main method for radon measurement, but it needs to stand for 3h after sampling before starting measurement. In order to meet the needs of rapid measurement of radon in scintilators, a rapid measurement method for radon in scintilators was established according to the decay relationship of radon and its progeny under the same efficiency condition of Rn-222, Po-218 and Bi-214. Based on the integral counting method, the calibration factor K0 at the measurement period of 60min was used to calculate the theoretical calibration factors at the measurement period of 30 min and 15 min. A 54 mL scintillation chamber with a detection efficiency of approximately 100% for radon and its daughters was selected to carry out rapid calibration experiments at a radon concentration of 20 Bq/mL. The experimental results show that the error between the experimental value and the theoretical value is within 5%, which can realize the rapid measurement of radon in scintillation chamber.