The Better Efficiency Calibration for HPGe Detector by Comparing the Single Point Gamma Sources and Multi-nuclides Gamma Source for k0-NAA Method

To obtain high quality of results in gamma spectrometry, it is necessary to calibrate energy and efficiency of gamma detector as accurate as possible. To achieve this aim, utilizing the convenient gamma source can be very useful. Therefore, purpose of present study was to evaluate the determined efficiency by single point gamma sources and multi-nuclides gamma source in a high purity germanium (HPGe) detector. The multi-nuclides source comprised 241 Am, 109 Cd, 57 Co, 137 Cs and 60 Co nuclides and single point sources of 241 Am, 133 Ba, 137 Cs and 60 Co were utilized under identical geometry to calibrate efficiency of HPGe detector. The source-detector distance was 15.8 cm. The accuracy of the method was evaluated by analyzing IAEASoil 7 as certified reference materials in k0-neutron activation analysis (k0-NAA) method. Our findings were demonstrated the result of multi-nuclides source was more reliable.