title: Comparison of two spectrometric counting modes for fast analysis of selected radionuclides activity.
abstract: The two counting modes: a normal with a single HPGE detector and second with the additional anti-Compton shield of the annular NaI(Tl) detector have been compared for fast determination of the activity concentration of thorium232Th in the building materials. The232Th activity concentration was calculated by measurement of its decay products:212Pb,212Bi and208Tl as well228Ac content. Although the Compton suppression mode applied in gamma spectrometry systems in general increase sensitivity of the analysis, but in case of 583 keV the most abundant208Tlγ-line, the significant reduction of photon counting rate was observed.
authors.affiliation: Technical University of Lodz, Institute of Applied Radiation Chemistry, Wróblewskiego 15, 90-924 Łódź, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Długosz-Lisiecka
keywords: Activity equilibrium; Anticoincidence mode; Coincidence photons