Influence of angular correlations on the full energy peak efficiency calibration using the sum peak method

Abstract To investigate the accuracy of the calibration of the HPGe detectors using an uncalibrated complex gamma cascade emitting source and the sum-peak method, Monte Carlo simulations were conducted. It was shown that accuracy below 5% is achievable for a 133 Ba source, only if the spectral data are corrected for angular correlations even at short distances from the detector endcap.