Implementation of calculation codes in gamma spectrometry measurements for corrections of systematic effects

Validation of EFFTRAN for efficiency transfer to distant geometries and volume sources

“…The results of this work show that EFFTRAN is fit-for-purpose also for ET to somewhat more complex geometries including absorbing materials in different positions relative to the detector. In an earlier work [4] EFFTRAN showed to be fit-for-purpose for ET within a sample geometry as well as between different sample containers. Combined with the results in the work presented herein, only one calibration of a detector system might in the end be needed from which correction factors for deviation in geometry can be calculated, including different distances.…”

“…A certified mixed radionuclide solution (Eckert & Ziegler, USA) emitting gamma photons in the energy interval 60-1836 keV was used to calibrate the detector for a geometry where the container (D = 64.9 mm, H = 19.7 mm) was placed directly on the endcap. The calibration method described in detail in [4] was used. This calibration method results in a detector model where the dead layer thickness (using a low gamma ray energy) and the detector-to-endcap distance (using a high gamma ray energy) are adjusted in order to fit calculated efficiencies to the empirical efficiencies.…”

“…From this intermediate geometry a second ET was done to the measurement geometry. The detector model was the same as the one presented earlier [4]. In the distant geometries a small TCS effect (maximum of about 2% losses) exists for the gamma ray energies of 88 Y and 60 Co and was accounted for.…”

“…There are a few specialised calculations codes that are in use for the calculation of such correction factors [1][2][3]. Corrections for geometry deviations within a specific sample container, as well as to different sample containers using different codes were earlier proven to work well [4].…”

Experimental validation of corrections factors for γ–γ and γ–X coincidence summing of 133Ba, 152Eu, and 125Sb in volume sources

“…A semi-empirical coincidence free calibration was established in the energy range 60-1836 keV. This followed the procedure as described in Jonsson et al [12]. First, the detector model was optimized, based on the efficiencies of the TCS free radionuclides in the calibration source.…”