Development of radon calibration chamber at KRISS

Radon calibration chamber has been constructed to test and calibrate radon and radon progeny detectors at various environmental conditions and to study the characteristic behavior of radon decay products. The size of main room in the chamber is 3.2 m×3.3 m×2.4 m (25.3 m3) and the total volume of the chamber is 39.1 m3. The maximum concentration of radon in the chamber can be maintained up to 250 kBq m−3 and temperature and humidity are controlled in the ranges of (10–40)°C and (30–80)%, respectively. The equilibrium factor and unattached fraction of radon progeny are determined at the radon concentration of 2 kBq m−3.