A LaBr3:Ce-NaI(Tl) Phoswich for X- and low energy γ-ray astronomy

Details A LaBr3:Ce-NaI(Tl) Phoswich for X- and low energy γ-ray astronomy A LaBr3:Ce-NaI(Tl) Phoswich for X- and low energy γ-ray astronomy

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010nimpa.623..995m&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 623, Issue 3, p. 995-998.

Physics

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Scientific paper

We report about the testing and performance of a Phoswich detector made of 3 in. diameter and 0.5 in. thick LaBr3:Ce with 3 in. diameter and 1 in. thick NaI(Tl). A pulse shape analysis using the zero-crossover technique was used to separate the signals from the individual layers. A significant reduction in general background and about 20% reduction in the X-ray peak due to internal activity around 30 keV was achieved by using the detector in anti-coincidence mode. This reduction of internal activity around 30 keV was also found to be in good agreement with the result from GEANT4 simulation. The energy resolution of the LaBr3:Ce is found to be inferior in the Phoswich configuration due to the absorption of the photons in the thicker NaI(Tl).

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