Compton suppressed scintillation spectrometer based on a cluster of 9$\times$CeBr$_{3}$-NaI(Tl) phoswich detectors

Abstract

Measurements of the characteristics of an Compton suppressed spectrometer consisting of 9$\times$CeBr$_{3}$-NaI(Tl) phoswich detectors surrounded by four CsI(Tl) scintillation detectors intended for suppressing the Compton component of the spectrum have been carried out. Measurements were performed using gamma and neutron radiation sources. Key parameters of the spectrometer have been determined: the suppression factor of the Compton part of the $γ$-spectrum, as well as the dependencies of the neutron detection efficiency on their energy at various detection threshold values.

Figures (7)

• Figure 1: Photo of the MULTI experimental setup.
• Figure 2: a) Scintillation CeBr$_3$-NaI(Tl) phoswich detector. b) Cluster of 9$\times$phoswich detectors. c) Compton suppressed $\gamma$-spectrometer from a cluster of phoswich detectors and 4 suppressed Compton shield detectors.
• Figure 3: Two-dimensional spectrum of the distribution of PMT pulse charges, registering scintillations of CeBr$_3$-NaI(Tl) crystals of a phoswich detector from a $^{60}$Co source. "1" – area of events of $\gamma$-quantum registration only in CeBr$3$, "2" – area of events of $\gamma$-quantum registration only in NaI(Tl), "3" - area of events of $\gamma$-quantum registration in both CeBr${3}$ and NaI(Tl) scintillators
• Figure 4: Energy spectra of $\gamma$-sources $^{60}$Co (a) and $^{152}$Eu (b) with superimposed amplitude spectra obtained under Compton suppressed shield conditions.
• Figure 5: a) Time spectrum of $\gamma$-$\gamma$ and $\gamma-n$ coincidence of particles emitted from a $^{239}$Pu/$^{9}$Be source; b) Energy spectrum of neutrons emitted from the $^{239}$Pu/$^{9}$Be source in coincidence with $\gamma$-quanta $E\gamma$ = 4.44 MeV.