A new calibrated chamber for parametric studies of radon and thoron gases

Abstract A new environmental radonchamber has been designed, constructed, and tested by our group. The design was evolved in order to meet the needs of several different radondetection techniques, both active and passive. The radonactivity concentration of the barrelwas determined by cross calibration against the standard radonchamber at the UK National Radiological Protection Board with known activity concentration, using the Lucas cellscintillation method. The radonactivity concentration inside the barrelwas found to be about 90 kBqm −3 .