Efficiency Application of Monte Carlo Simulation and HPGe Detector Using Mapping Method

In order to obtain the detection efficiency according to the distance around the detector, the total energy peak efficiency was used, and the grid mapping method was used to investigate axis-symmetry. The detector was measured at 0.5 cm intervals up to 5 cm in the x, z, direction, and 5.5 cm in the y direction. The efficiency of the cylinder beaker and marinelli beakers at the center of the 134Cs 604 keV detector was compared with the efficiency of the mapping method. For cylinder beakers, the efficiency was 0.0412 +/- 0.002, and the efficiency by mapping was 0.040 +/- 0.001, which was consistent within 3 % of the uncertainty range. For Marinelli beakers, the efficiency was 0.0242 +/- 0.002 mapping efficiency was 0.0248 +/- 0.0013. It was confirmed that precise measurement of radioactive sources with volume was possible when measured at each point around the detector.