title: Radiation background in a LaBr3(Ce) gamma-ray scintillation detector.
abstract: Gamma-ray spectral analyses with a 5-cm × 5-cm LaBr3(Ce) detector and a NaI(Tl) detector of the same size show that the LaBr3(Ce) has much better gamma-ray peak resolution and full-energy peak counting efficiency but worse detection sensitivity. The LaBr3(Ce) detector has relatively high intrinsic radiation background due to the naturally occurring La radioisotope in lanthanum. Although this La background is entirely below the energy of 1,500 keV, additional background is in the energy region between 1,500 keV and 2,750 keV. The manufacturer attributes this radiation to alpha particles emitted by the five short-lived progeny of an Ac impurity. Comparative values for peak resolution, full-energy peak counting efficiency, and detection sensitivity are reported for Am, Co, and Cs. Results of counting Cs sources at two activity levels demonstrate the impact of background on detection sensitivity.
authors: Environmental Radiation Center, EOSL, GTRI, Georgia Institute of Technology, Atlanta, GA 30332-0834, USA. robert.rosson@gtri.gatech.edu
authors: Robert
authors: R
authors: Rosson
authors: Jeffrey
authors: J
authors: Lahr
authors: Bernd
authors: B
authors: Kahn
mesh_terms: D001417:Background Radiation; D001965:Bromides; D005720:Gamma Rays; D007811:Lanthanum; D012588:Scintillation Counting / Q000379:methods*; D013057:Spectrum Analysis
chemical_list: D001965:Bromides; C547466:lanthanum bromide; D007811:Lanthanum