Study on Absolute Humidity Influence of NRL-1 Measuring Apparatus for Radon

The absolute humidity and temperature’s effects on the NRL-1 measuring apparatus for radon were studied in this paper. By controlling the radon activity concentration of the radon laboratory in University of South China and improving the temperature and humidity adjust strategy, different correction factor values under different absolute humidities were obtained. Moreover, a correction curve between 1.90 and 14.91 g/m³ was also attained. The results show that in the case of absolute humidity, when it is less than 2.4 g/m³, collection efficiency of the NRL-1 measuring apparatus for radon tends to be constant, and the correction factor of the absolute humidity closes to 1. However, the correction factor increases nonlinearly along with the absolute humidity.