Calibration of High-Purity Germanium Detector Efficiency Using Standard Charcoal Canister Resources

To determine the activity of radon progeny in the environment, it is necessary to establish a calibration curve for a high-purity germanium (HPGe) detection system using gamma rays in the energy range of 352 keV to 609 keV.Therefore, in this study, gamma radioactive sources with known activity were used to obtain the efficiency calibration curve of the HPGe detector.The sources used in this experiment were charcoal canisters doped with specific activities of radioactive elements such as Eu-152, Ba-133, Cs-137, and Am-241.By calculating the initial activity at the time of source preparation (A0) and knowing the time interval between the preparation of the standard source and its counting in the detector, the current activity of the source was calculated.By measuring the activity of the gamma-emitting sources using the detector and determining the efficiency factor as a function of the energy of each gamma-emitting source, an applicable efficiency equation as a function of gamma-ray energy can be derived, allowing the detector to be calibrated based on the efficiency factor at the desired gammaray energy.