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Title: Gamma-gamma coincidence performance of LaBr 3 :Ce scintillation detectors vs HPGe detectors in high count-rate scenarios

Abstract

Development of LaBr3: CE Scintillation Detectors for Gamma-Gamma Coincidence System with Applications in Fission Product Analysis

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1406684
Report Number(s):
PNNL-SA-118496
Journal ID: ISSN 0969-8043; AF5835000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Radiation and Isotopes; Journal Volume: 122; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
Development of LaBr3:CEScintillation Detectors for Gamma-Gamma; LaBr3

Citation Formats

Drescher, A., Yoho, M., Landsberger, S., Durbin, M., Biegalski, S., Meier, D., and Schwantes, J. Gamma-gamma coincidence performance of LaBr 3 :Ce scintillation detectors vs HPGe detectors in high count-rate scenarios. United States: N. p., 2017. Web. doi:10.1016/j.apradiso.2017.01.012.
Drescher, A., Yoho, M., Landsberger, S., Durbin, M., Biegalski, S., Meier, D., & Schwantes, J. Gamma-gamma coincidence performance of LaBr 3 :Ce scintillation detectors vs HPGe detectors in high count-rate scenarios. United States. doi:10.1016/j.apradiso.2017.01.012.
Drescher, A., Yoho, M., Landsberger, S., Durbin, M., Biegalski, S., Meier, D., and Schwantes, J. Sat . "Gamma-gamma coincidence performance of LaBr 3 :Ce scintillation detectors vs HPGe detectors in high count-rate scenarios". United States. doi:10.1016/j.apradiso.2017.01.012.
@article{osti_1406684,
title = {Gamma-gamma coincidence performance of LaBr 3 :Ce scintillation detectors vs HPGe detectors in high count-rate scenarios},
author = {Drescher, A. and Yoho, M. and Landsberger, S. and Durbin, M. and Biegalski, S. and Meier, D. and Schwantes, J.},
abstractNote = {Development of LaBr3: CE Scintillation Detectors for Gamma-Gamma Coincidence System with Applications in Fission Product Analysis},
doi = {10.1016/j.apradiso.2017.01.012},
journal = {Applied Radiation and Isotopes},
number = C,
volume = 122,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}
  • In this study, a radiation detection system consisting of two cerium doped lanthanum bromide (LaBr 3:Ce) scintillation detectors in a gamma-gamma coincidence configuration has been used to demonstrate the advantages that coincident detection provides relative to a single detector, and the advantages that LaBr 3:Ce detectors provide relative to high purity germanium (HPGe) detectors. Signal to noise ratios of select photopeak pairs for these detectors have been compared to high-purity germanium (HPGe) detectors in both single and coincident detector configurations in order to quantify the performance of each detector configuration. The efficiency and energy resolution of LaBr 3:Ce detectors havemore » been determined and compared to HPGe detectors. Coincident gamma-ray pairs from the radionuclides 152Eu and 133Ba have been identified in a sample that is dominated by 137Cs. Gamma-gamma coincidence successfully reduced the Compton continuum from the large 137Cs peak, revealed several coincident gamma energies characteristic of these nuclides, and improved the signal-to-noise ratio relative to single detector measurements. LaBr 3:Ce detectors performed at count rates multiple times higher than can be achieved with HPGe detectors. The standard background spectrum consisting of peaks associated with transitions within the LaBr 3:Ce crystal has also been significantly reduced. Finally, it is shown that LaBr 3:Ce detectors have the unique capability to perform gamma-gamma coincidence measurements in very high count rate scenarios, which can potentially benefit nuclear safeguards in situ measurements of spent nuclear fuel.« less
  • The performance of new scintillator detectors based on LaBr{sub 3}(Ce) technology was evaluated in conjunction with the Gammasphere spectrometer. Specifically, the lifetimes of states between 50 ps and 1 ns, populated in the decay of the {sup 177m}Lu isomeric state (T{sub 1/2} = 160 d), have been measured. Even though the decay scheme is rather complex, it is possible to perform precise measurements because of the superior energy resolution of the LaBr{sub 3}(Ce) detectors, compared to that of BaF{sub 2} scintillators, when used in combination with the power of the Gammasphere array to isolate a specific {gamma} cascade
  • Commercially available LaBr{sub 3}:5% Ce{sup 3+} scintillators show with photomultiplier tube readout about 2.7% energy resolution for the detection of 662 keV {gamma}-rays. Here we will show that by co-doping LaBr{sub 3}:Ce{sup 3+} with Sr{sup 2+} or Ca{sup 2+} the resolution is improved to 2.0%. Such an improvement is attributed to a strong reduction of the scintillation light losses that are due to radiationless recombination of free electrons and holes during the earliest stages (1-10 ps) inside the high free charge carrier density parts of the ionization track.
  • The authors report on the performance of two small field of view, compact gamma cameras working in single photon counting in planar imaging tests at 122 and 140 keV. The first camera is based on a LaBr{sub 3}:Ce scintillator continuous crystal (49x49x5 mm{sup 3}) assembled with a flat panel multianode photomultiplier tube with parallel readout. The second one belongs to the class of semiconductor hybrid pixel detectors, specifically, a CdTe pixel detector (14x14x1 mm{sup 3}) with 256x256 square pixels and a pitch of 55 {mu}m, read out by a CMOS single photon counting integrated circuit of the Medipix2 series. Themore » scintillation camera was operated with selectable energy window while the CdTe camera was operated with a single low-energy detection threshold of about 20 keV, i.e., without energy discrimination. The detectors were coupled to pinhole or parallel-hole high-resolution collimators. The evaluation of their overall performance in basic imaging tasks is presented through measurements of their detection efficiency, intrinsic spatial resolution, noise, image SNR, and contrast recovery. The scintillation and CdTe cameras showed, respectively, detection efficiencies at 122 keV of 83% and 45%, intrinsic spatial resolutions of 0.9 mm and 75 {mu}m, and total background noises of 40.5 and 1.6 cps. Imaging tests with high-resolution parallel-hole and pinhole collimators are also reported.« less