Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011nimpa.629..157q&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 629, Issue 1, p. 157-169.
Physics
Scientific paper
Lanthanum bromide scintillation detectors produce very high light outputs (˜60,000 ph/MeV) within a very short decay time (typically ˜20 ns) which means that high instantaneous currents can be generated in the photocathode and dynode chain of the photomultiplier tube (PMT) used for the scintillation readout. The net result is that signal saturation can occur long before the recommended PMT biasing conditions can be reached.In search of an optimized light readout system for LaBr3, we have tested and compared two different PMT configurations for detection of gamma-rays up to 15 MeV. This range was chosen as being appropriate for gamma-ray remote sensing and medium energy nuclear physics applications. The experiments were conducted at two facilities: the Laboratori Nazionali del Sud (LNS) in Catania, Italy [1] and the High Intensity Gamma-ray Source (HIγS) at Triangle University Nuclear Laboratory, in Durham, North Carolina, USA [2].The PMT configurations we have tested are (1) a standard dynode chain operated under-biased; (2) a 4-stage reduced chain operated at nominal inter-dynode bias.The results are that shortening the number of active stages, as in configuration (2), has advantages in preserving energy resolution and avoiding PMT saturation over a large energy range.However, the use of an under-biased PMT, configuration (1), can still be considered a satisfactory solution, at least in the case of PMTs manufactured by Photonis.The results of this study will be used in support of the Mercury Gamma-ray and Neutron Spectrometer (MGNS) on board of BepiColombo, the joint ESA/JAXA mission to Mercury, scheduled for launch in 2014.
Ahmed Mainuddin
Alba Rosa
Bellia G.
Benzoni G.
Blasi N.
No associations
LandOfFree
High energy gamma-ray spectroscopy with LaBr3 scintillation detectors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High energy gamma-ray spectroscopy with LaBr3 scintillation detectors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High energy gamma-ray spectroscopy with LaBr3 scintillation detectors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1133503