Abstract: The measurement of radon precipitation rate is of great significance to the decommissioning of China’s uranium mining and metallurgical facilities, and is a key link in evaluating the treatment effect of uranium tailing dams against radon precipitation. In view of the large workload of investigation on radon precipitation rate in uranium tailing dams in China and the long measurement period of instruments, this study proposes a technical method based on electret radon precipitation rate, which shortens the measurement time for radon precipitation rate and increases the daily measurement points. The increased frequency of measurement can be used to quickly investigate the radon precipitation rate in wide-area uranium mining and metallurgical sites. The results of laboratory calibration and field application show that the device is reliable, the method is feasible, and the result is credible. Under the same conditions of the number of measurement points for the radon precipitation rate, the electret method is 2/9 of the RAD7 measurement time.

Key words: radon precipitation rate, electret, high efficiency, measurement period