Akademik Veri Yönetim Sistemi
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, cilt.269, sa.1, ss.141-145, 2006 (SCI-Expanded)
The bremsstrahlung radiation energy spectra were produced by hard beta-emitters the Sr-90-Y-90 contaminated tea sample sources placed in a copper cylinder (cylinder counting geometry) and encapsulated in two Cu discs (sandwich counting geometry). These energy spectra were directly measured by using two separate gamma-ray spectrometers with a coaxial 110% efficient HpGe detector and a 110 cm(3) HpGe well-type detector. The minimum detectable activity and the absolute efficiency of beta-activity for the sandwich and cylinder geometries were found to be 23 Bq. kg(-1) and (1.67 +/- 0.04)% and 55 Bq. kg(-1) and (2.61 +/- 0.05)%, respectively. These results indicate that the bremsstrahlung radiation counting method can be applied to some environmental studies when high efficient HpGe detectors, especially well-type HpGe are used.