A semi-empirical method for calculation of true coincidence corrections for the case of a close-in detection in γ-ray spectrometry

Methods for spectral interference corrections for direct measurements of 234U and 230Th in materials by gamma-ray spectrometry

“…After that, a TCS corrected-FEP curve is obtained as the 'final fit' as shown in Figure 5. It is worth noting that the details of this procedure are necessary for calculation TCS correction factors, which are already described in the previous work (17) . As a result, the fitting coefficients for a final TCS corrected-FEP efficiency curve given in Table 3 (also shown on Figure 5) were used to determine the TCS factors F COI for relevant gamma rays from any nuclide by using a freely available 'TrueCoinc' program, together with the use of the required PTT ratios given in Table 4.…”

“…These curves are then used to compute the TCS factors for the relevant gamma rays used in the analysis. On the other hand, since a detailed procedure for the calculation of TCS correction factors required for any coincident gamma ray has already been described (17) , elsewhere, no additional detail is given for the TCS correction method in this paper to keep space at minimum. However, it is based on the knowledge of TCS corrected-FEP efficiency and PTT efficiency calibration curves.…”

Correction methodology for the spectral interfering γ-rays overlapping to the analytical peaks used in the analysis of 232Th

“…It is worth noting that in case the composition of the used sample is unknown, the relevant F s factors for the g-ray energies should be determined from the well-known practical procedures in the literature. The TCS factors of the used g-ray energies are also readily determined at a given counting geometry by employing one of several TCS correction methods (Sudá r, 2002;Dryá k and Ková r, 2009;Yücel et al, 2009a;Zhu et al, 2009). …”

“…That is, if it is intended to perform the high-quality gamma spectrometric measurements, at least, the corrections for self-absorption effects for the measured g-rays with energy of generally below 300 keV, true coincidence summing (TCS) effects for the multi-cascading g-ray transitions, and the spectral gamma interferences to the analytical peaks must be taken into account in the used analytical procedures. Fortunately, there are numerous well-defined correction methods for the correction of TCS effects (Sudá r, 2002;DSM, 2005;Arnold and Sima, 2006;Dryá k and Ková r, 2009;Zhu et al, 2009;Yücel et al, 2009a) and self-absorption effects (ASTM E181, 2003;McMahon et al, 2004) from practical point of view. However, in literature survey, the methods relating to the estimation of the contributions from the interference peaks overlapping to the analytical peak of interest is still lacking or open to the investigation, which is important in view of obtaining more reliable peak area determinations.…”

Coincidence Summing Factor Calculation for Volumetric γ-ray Sources Using Geant4 Simulation

“…Kajimoto et al calculated the CS correction for 24N point source in case of close detector-to-source geometry using EGS5 code Moto Carlo simulation [11]. Yucel et al used a semiempirical formula to calculate the true CS corrections based on the total e ciency calculation and this method can be applied without any di culty to Ge detectors for coincident nuclide [12]. Taibi et al used the MCNP5 code Monto Carlo simulation to evaluate the true CS corrections for volumetric Eu-152 sources in gamma-ray spectroscopy, the results were confirmed with the TrueCoinc software, and a good agreement was obtained [13].…”