Abstract: The calibration results of the BG2015R Radon measuring instrument using two different methods, namely the radon solid source and the radon chamber, were compared and analyzed. The results show that the calibration coefficient (K) obtained from calibrating the BG2015R Radon measuring instrument in the radon chamber at three different measuring points is 5%, larger than that obtained using the radon solid source. The repeatability of the radon chamber calibration was calculated at low concentration measurement points, while the repeatability of the radon solid source calibration was lower due to the higher measurement concentration. When calibrating the BG2015R Radon measuring instrument using the radon chamber, the relative inherent error was calculated using the calibration coefficients from three measurement points, allowing for a linear evaluation of the instrument’s response. However, when using the radon solid source calibration, repeated measurements were only made at a single measurement point, and the relative error was calculated from multiple calibration results, which did not allow for a linear evaluation.

Key words: Radon measuring instrument, Calibration, Radon chamber, Radon solid source