A method to simultaneously and continuously measure the²²²Rn and²²⁰Rn exhalation rates of soil in an open loop

Abstract

This paper presents a process in which a radon monitor based on the electrostatic collection method is used to measure the (222)Rn and (220)Rn exhalation rates simultaneously and continuously employing a ventilation-type accumulation chamber. Generally, the radon exhalation rate can be measured by accumulation technique, but cannot be measured continuously. The advantage of this method using a ventilation-type accumulation chamber is that the radon exhalation rates can be measured continuously. Even though the environmental air is drawn into the chamber, the low atmospheric values of radon and thoron do not influence the measurement accuracy. The (222)Rn and (220)Rn exhalation rates error from the environmental air is less than 5% in this experiment.

Comparison of two models for measuring radon exhalation rate with a ventilation chamber by numerical simulation

“…Two radon exhalation rates were simulated. The first was 1 Bq m −2 s −1 to simplify the calculation and reduce the statistical fluctuation, and the second was 0.03 Bq m −2 s −1 to simulate the actual radon exhalation rate of soil which is about tens of mBq m −2 s −1 [20].…”

Development of the ultra-high sensitivity radon monitor based on electrostatic collection method

“…Due to its high reliability, it is widely used in radon detection in various scenarios. [19][20][21][22]. We use RAD7 to detect and measure the radon concentration in the cavity in real time, and the dew point meter was used to monitor the humidity in the measurement chamber.…”