Experimental and Simulated Spectral Gamma-Ray Response of a NaI (Tl) Scintillation Detector used in Airborne Gamma-Ray Spectrometry

Abstract. 57 60 88 109 133 137 152Eu calibration point sources with known activities and source-detector geometries under laboratory conditions. In addition, empirical calibration and resolution functions were derived from these measurements combined with additional radiation measurements adopting natural uranium, thorium and potassium volume sources. The simulation results show superior accuracy and precision compared to previous AGRS simulation models with a median relative spectral error < 10 % for most of the radiation sources. Moreover, the implementation of a lower level discriminator model and detailed modelling of the laboratory result in a significant improvement in model accuracy for spectral energies < 100 keV compared to previous studies. Yet thorough statistical analysis incorporating statistical and systematic uncertainty estimates revealed statistically significant deviations between the simulated and measured spectra in the spectral region around the Compton edge, which could be attributed to the scintillator non-proportionality. These findings imply that the linear energy deposition model applied in this and previously developed AGRS simulation models should be revised and considered to be replaced by more accurate non-proportional models.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Experimental and Simulated Spectral Gamma-Ray Response of a NaI (Tl) Scintillation Detector used in Airborne Gamma-Ray Spectrometry ; volume:57 ; year:2022 ; pages:89-107 ; extent:19 ; Advances in geosciences ; 57 (2022), 89-107 (gesamt 19)

Contributors, Places and Time

• Creator: Breitenmoser, David ; Butterweck, Gernot ; Kasprzak, Malgorzata Magdalena ; Yukihara, Eduardo Gardenali ; Mayer, Sabine

Further information

• DOI: 10.5194/adgeo-57-89-2022
• URN: urn:nbn:de:101:1-2022063005235897472712
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:23 AM CEST