Determination of full-energy peak efficiency at the center position of a through-hole-type clover detector between 0.05 MeV and 3.2 MeV by source measurements and Monte Carlo simulations

•Novel Ge detector having large solid angle for γ-ray measurements was developed.•Correction for coincidence summing was performed with measurements and simulation.•Peak efficiency was determined between 0.05 MeV and 3.2 MeV.

Full-energy peak efficiency at the center position of a through-hole-type clover detector was determined by the measurement of standard sources and by Monte Carlo simulation. The coincidence summing under the large-solid-angle condition was corrected using Monte Carlo calculation based on the specific decay scheme for 133Ba, 152,154Eu, and 56Co. This allowed the peak efficiency to be extended from 0.05 MeV to 3.2 MeV with an approximate uncertainty of 3%.