Abstract
The newly developed cerium tribromide (CeBr3) detector has reduced intrinsic gamma-ray activity with gamma energy restricted to 1400–2200 keV energy range. This narrower region of background gamma rays allows the CeBr3 detector to detect more than one gamma ray to analyze the gamma-ray spectrum. Use of multiple gamma-ray intensities in elemental analysis instead of a single one improves the accuracy of the estimated results. Multigamma-ray detection capability of a cylindrical 75 mm × 75 mm (diameter × height) CeBr3 detector has been tested by analyzing the chlorine concentration in water samples using eight chlorine prompt gamma rays over 517 to 8578 keV energies utilizing a D-D portable neutron generator-based PGNAA setup and measuring the corresponding minimum detection limit (MDC) of chlorine. The measured MDC of chlorine for gamma rays with 517–8578 keV energies varies from 0.07 ± 0.02 wt% to 0.80 ± 0.24. The best value of MDC was measured to be 0.07 ± 0.02 wt% for 788 keV gamma rays. The experimental results are in good agreement with Monte Carlo calculations. The study has shown excellent detection capabilities of the CeBr3 detector for eight prompt gamma rays over 517–8578 keV energy range without significant background interference.
Highlights
Gamma-ray spectroscopy techniques are continuously progressing due to rapid advances in the development and fabrication of fast and higher light output scintillation materials [1,2,3]
The multiple gamma-ray detection capabilities of a cylindrical 76 mm × 76 mm CeBr3 detector were studied through chlorine concentration measurements in saline water samples utilizing eight chlorine prompt gamma rays [13] in conjunction with a portable neutron generator-based PGNAA setup [8, 12]
Only three representative gamma-ray difference spectra are shown for which we obtained the best value of minimum detection limit (MDC)
Summary
Gamma-ray spectroscopy techniques are continuously progressing due to rapid advances in the development and fabrication of fast and higher light output scintillation materials [1,2,3]. The reduced intrinsic activity of the CeBr3 detector has a narrower energy range of 1400–2200 keV [9, 12], as compared to 780–2200 keV energy range reported for the intrinsic activity of the LaBr3:Ce and LaCl3:Ce ([1, 3, 7]) These features enable the CeBr3 detector to provide a larger interference-free energy range for the gamma-ray detection in prompt gamma-ray analysis of bulk samples as compared to the LaBr3:Ce and LaCl3:Ce detectors. The multiple gamma-ray detection capabilities of a cylindrical 76 mm × 76 mm (height × diameter) Ce:Br3 detector has been tested through analysis of saline water samples containing 0.0–8.0 wt% chlorine concentrations. Details of this study are reported of the paper
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