Demir, Faruk2021-03-202021-03-2020151073-91491525-6030http://doi.org/10.1080/10739149.2015.1045982https://hdl.handle.net/20.500.12885/1137Mass attenuation coefficients of H2O, PbO, and cellulose were determined using 59.5keV gamma energies with CdTe and NaI (Tl) detectors at five different source-sample distances. The pencil beam method was used to measure the mass attenuation coefficients. All experimental mass attenuation coefficients were compared with simulated results. A linear relationship between source-sample distance and mass attenuation coefficients was determined by regression analysis. The correlation coefficients were 0.99, 0.96, and 0.98 for cellulose, H2O, and PbO using a NaI (Tl) detector, while the values were 0.98, 0.99, and 0.99 with the Cd(Te) detector. If the beams were emitted as a narrow beam instead of as a pencil beam, a constant relationship instead of a linear increase was observed for the mass attenuation coefficients as a function of distance. Consequently, the narrow beam method was superior to the pencil beam approach.eninfo:eu-repo/semantics/closedAccessAmericiumgamma ray spectroscopymass attenuation coefficientsArticle10.1080/10739149.2015.1045982436661668WOS:000361118100006Q4Q3