A simple method of efficiency calibration for gamma spectrometry was performed. This method, which focused on measuring airborne radioactivity collected on filter paper, was based on Monte Carlo simulations using the toolkit GEANT4. Experimentally, the efficiency values of an HPGe detector were calculated for a multi-gamma disk source. These efficiency values were compared to their counterparts produced by a computer code that simulated experimental conditions. Such comparison revealed biases of 24, 10, 1, 3, 7, and 3% for the radionuclides (photon energies in keV) of 139Ce (166), 113Sn (392), 137Cs (662), 60Co (1,173), 60Co (1,333), and 88Y (1,836), respectively. The output of the simulation code was in acceptable agreement with the experimental findings, thus validating the proposed method.
*Department of Physics, Faculty of Science, Kuwait University, Khaldia, Kuwait; †Center for Research in Environmental Radiation, Faculty of Science, Kuwait University, Khaldia, Kuwait.
The author declares no conflicts of interest.
For correspondence contact: Tareq Alrefae, Department of Physics, Faculty of Science, Kuwait University, Khaldia, Kuwait, or email at firstname.lastname@example.org.
(Manuscript accepted 10 March 2014)