1983 Volume 32 Issue 12 Pages 595-601
The Monte Carlo code PEAK was developed to calculate the peak efficiency of Ge (Li) and high purity Ge (HPGe) detectors to voluminal sources of cylindrical and Marinelli-type shapes. The accuracy of the PEAK code has already been verified for Ge (Li) detectors and in this study its accuracy to HP Ge detectors was investigated. First, the sensitive region of the HP Ge detector was determined from the combination of the collimated beam and the standard point source experiments. By using this shape of the sensitive region, the peak efficiencies to radioactive agar, activated alumina and manganese dioxide samples encapsulated in a cylindrical vessel were calculated and showed very good agreement within about several % with the ex-perimental results.