scholarly journals Bismuth-Loaded Polymer Scintillators for Gamma Ray Spectroscopy

2011 ◽  
Vol 1341 ◽  
Author(s):  
Benjmain L. Rupert ◽  
Nerine J. Cherepy ◽  
Benjamin W. Sturm ◽  
Robert D. Sanner ◽  
Zurong Dai ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
Light Yield ◽  
Equal Weight ◽  
Emission Maximum ◽  
Transmission Electron ◽  
Gamma Ray Spectroscopy ◽  
Small Clusters ◽  
Better Than ◽  
Triplet Harvesting

ABSTRACTWe synthesize a series of polyvinylcarbazole (PVK) monoliths containing varying loadings of triphenyl bismuth as a high-Z dopant and varying fluors, either organic or organometallic, in order to study their use as scintillators capable of gamma ray spectroscopy. A trend of increasing bismuth loading resulting in a better resolved photopeak is observed. For PVK parts with no fluor or a standard organic fluor, diphenylanthracene (DPA), increasing bismuth loading results in decreasing light yield while with samples 1 or 3 % by weight of the triplet harvesting organometallic fluor bis(4,6-difluoropyridinato-N,C2)picolinatoiridium (FIrpic) show increasing light yield with increasing bismuth loading. Our best performing PVK/ BiPh3/FIrpic scintillator with 40 wt % BiPh3 and 3 wt % FIrpic has an emission maximum of 500 nm, a light yield of ∼30,000 photons/MeV, and energy resolution better than 7% FWHM at 662 keV. Replacing the Ir complex with an equal weight of DPA produces a sample with a light yield of ∼6,000 photons/MeV, with an emission maximum at 420 nm and energy resolution of 9% at 662 keV. Transmission electron microscopy studies show that the BiPh3 forms small clusters of approximately 5 nm diameter.

Comparative Studies of the Light Yield Non-Proportionality and Energy Resolution of CsI(Tl), LYSO and BGO Scintillation Crystals

2016 ◽  
Vol 872 ◽  
pp. 266-270
Author(s):  
Pruittipol Limkitjaroenporn ◽  
Narong Sangwaranatee ◽  
Wuttichai Chaiphaksa ◽  
Jakrapong Kaewkhao
Keyword(s):  
Energy Resolution ◽  
Comparative Studies ◽  
Gamma Ray ◽  
Light Yield ◽  
Good Energy Resolution ◽  
Intrinsic Resolution ◽  
Scintillation Crystals ◽  
Good Energy ◽  
Better Than

This article, for comparison, the non-proportionality of light yield and energy resolution of BGO, LYSO and CsI(Tl) scintillators couple to the R1306 PMT readouts were investigated. At 662 keV from 137Cs source, the good energy resolution of 7.13% for CsI(Tl) superior than LYSO and BGO scintillators. The energy resolution on gamma-ray energy was also evaluated to expose the scintillator intrinsic resolution parameters. For non-proportionality of light yield, the study showed a light yield non-proportionality 0.35% of LYSO, the value is better than 4.82 % for CsI(Tl) and 1.53 % of BGO scintillators.

Comparison of Lu3Al5O12:Ce and LaBr3:Ce Scintillators in Gamma-Ray Spectrometry

2011 ◽  
Vol 418-420 ◽  
pp. 922-927
Author(s):  
Weerapong Chewpraditkul ◽  
Chalerm Wanarak ◽  
Marek Moszynski ◽  
Lukasz Swiderski
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
Light Yield ◽  
Gamma Ray Spectrometry ◽  
Timing Resolution ◽  
Intrinsic Resolution ◽  
Γ Rays ◽  
Γ Ray ◽  
Coincidence Timing ◽  
Better Than

The performances of Ce-doped Lu3Al5O12(LuAG:Ce) and LaBr3(LaBr3:Ce) scintillators were compared for γ-ray detection using photomultiplier tube ( XP5500B PMT) readout. For 662 keV γ-rays (137Cs source), an energy resolution of 3.5% obtained for LaBr3:Ce is much better than that of 6.7% obtained for LuAG:Ce, while the estimated photofraction of 28.0% for LuAG:Ce is higher than that of 16.2% for LaBr3:Ce. The light yield non-proportionality and energy resolution versus γ-ray energy were measured and the intrinsic resolution of the crystals was calculated. The coincidence timing resolution, obtained in this work for 511 keV annihilation quanta, was 583 ps and 204 ps, respectively, for LuAG:Ce –BaF2and LaBr3:Ce – BaF2detectors.

Lu1.8Y0.2SiO5:Ce and LaCl3:Ce Scintillators for Gamma-Ray Detection

2011 ◽  
Vol 284-286 ◽  
pp. 2064-2069
Author(s):  
Weerapong Chewpraditkul ◽  
Chalerm Wanarak ◽  
Marek Moszynski ◽  
Tomasz Szczesniak ◽  
Lukasz Swiderski
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
Light Yield ◽  
Timing Resolution ◽  
Intrinsic Resolution ◽  
Coincidence Timing ◽  
Better Than

The scintillation properties of Lu1.8Y0.2SiO5:Ce (LYSO:Ce) and LaCl3:Ce scintillators were studied under g-ray excitation. For 662 keV g-rays (137Cs source), energy resolution of 4.5% obtained for LaCl3:Ce coupled to XP5200B PMT is much better than that of 8.2% for LYSO:Ce. The estimated photofraction of 26.1% at 662 keV for LYSO:Ce is higher than that of 15.7 % for LaCl3:Ce. The non-proportionality of the light yield and energy resolution versus g-ray energy were measured and the intrinsic resolution of the crystals was calculated. The coincidence timing resolution, obtained in this work for 511 keV annihilation quanta, was 222 and 229 ps, respectively, for LYSO:Ce – and LaCl3:Ce – based detectors in coincidence with a BaF2detector.

Comparison of Lu0.7Y0.3AP:Ce and Bi4Ge3O12 Scintillators in Gamma Ray Spectrometry

2011 ◽  
Vol 284-286 ◽  
pp. 2008-2013
Author(s):  
Akapong Phunpueok ◽  
Weerapong Chewpraditkul ◽  
Pichet Limsuwan ◽  
Bing Kun Yu ◽  
Chalerm Wanarak
Keyword(s):  
Energy Resolution ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Light Yield ◽  
Photomultiplier Tube ◽  
Gamma Ray Spectrometry ◽  
Intrinsic Resolution ◽  
Measured Energy ◽  
Scintillation Crystals ◽  
Better Than

The scintillation response of Lu0.7Y0.3AP:Ce and Bi4Ge3O12 scintillation crystals have been compared using photomultiplier tube readout for photon energies ranging from 22.1 to 1274.5 keV. Lu0.7Y0.3AP:Ce showed a light yield non-proportionality of about 20% upon lowering energy from 1,274.5 to 22.1 keV, which is better than that of about 39% obtained for Bi4Ge3O12. Lu0.7Y0.3AP:Ce showed the light yield of 13,400 ph/MeV and energy resolution of about 8 % for 662 keV gamma rays from a 137Cs source. The photofraction of Bi4Ge3O12 is better than that of Lu0.7Y0.3AP:Ce. The intrinsic resolution of the crystals versus energy of gamma rays has been determined after correcting the measured energy resolution for photomultiplier tube statistics.

scholarly journals BiI3 Crystals for High Energy Resolution Gamma-Ray Spectroscopy

2017 ◽  
Author(s):  
Juan C. Nino ◽  
James Baciak ◽  
Paul Johns ◽  
Soumitra Sulekar ◽  
James Totten ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
High Energy ◽  
High Energy Resolution ◽  
Gamma Ray Spectroscopy

An experimental test of a large‐volume plastic detector for use in aerial gamma‐ray spectroscopy

Geophysics ◽  
1981 ◽  
Vol 46 (10) ◽  
pp. 1432-1438
Author(s):  
Joseph S. Duval ◽  
James A. Pitkin
Keyword(s):  
Gamma Radiation ◽  
Energy Resolution ◽  
Experimental Test ◽  
Large Volume ◽  
Sodium Iodide ◽  
Gamma Ray ◽  
Low Energy ◽  
Surface Distribution ◽  
Plastic Detector ◽  
Gamma Ray Spectroscopy

A large‐volume plastic detector for use in aerial gamma‐ray spectroscopy has been evaluated by the U. S. Geological Survey. The purpose of the evaluation was to compare the plastic polyvinyl toluene (PVT) detector with thallium‐activated sodium iodide [NaI(T1)] detectors in ability to define the surface distribution of gamma radiation from the decay of natural thorium, uranium, and potassium. Good performance from PVT detectors will allow aerial gamma‐ray detection to be less expensive and much less susceptible to physical or thermal shock compared to the use of NaI(T1) detectors. The experimental results indicate that PVT detectors can be used to measure the surface distribution of potassium (K), equivalent uranium (eU), and equivalent thorium (eTh). However, because of the relatively low‐energy resolution of the PVT detector and the subsequent increased interference among the energy windows used to measure K, eU, and eTh, the results of data reduction are statistically less accurate than those obtained using NaI(T1).

Strontium iodide scintillators for high energy resolution gamma ray spectroscopy

2008 ◽  
Author(s):  
Cody M. Wilson ◽  
Edgar V. van Loef ◽  
Jarek Glodo ◽  
Nerine Cherepy ◽  
Giulia Hull ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
High Energy ◽  
High Energy Resolution ◽  
Gamma Ray Spectroscopy

scholarly journals Instruments optimizations for low energy Gamma-ray detection

2019 ◽  
Vol 209 ◽  
pp. 01044
Author(s):  
Gonzalo Rodriguez ◽  
Aldo Morselli
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Chemical Evolution ◽  
Energy Resolution ◽  
Gamma Ray ◽  
Supernova Explosion ◽  
Low Energy ◽  
Previous Generation ◽  
Energy Gamma ◽  
Better Than

There is an experimental gap in the study of the non-thermal universe in the photon energy range from 0.3 to 100 MeV. We have analyzed the performance of a detector with unprecedented sensitivity, angular and energy resolution and combined with polarimetric capability to study of the most powerful Galactic and extragalactic sources and with a line sensitivity in the MeV energy range two orders of magnitude better than previous generation of instruments that can determine the origin of key isotopes fundamental for the understanding of supernova explosion and the chemical evolution of our Galaxy.

Scintillation Properties of Ce-Doped LuYAP Crystal for Gamma Ray Detection

2015 ◽  
Vol 804 ◽  
pp. 93-96
Author(s):  
Akapong Phunpueok ◽  
Voranuch Thongpool ◽  
Weerapong Chewpraditkul
Keyword(s):  
Energy Resolution ◽  
Gamma Ray ◽  
Light Yield ◽  
High Energy ◽  
Stopping Power ◽  
Strongly Correlated ◽  
Photon Yield ◽  
Good Energy Resolution ◽  
Intrinsic Resolution ◽  
Good Energy

In the present day, inorganic scintillating crystals become a main part in detection and spectroscopy of nuclear particles and high energy photons, more spectively in X/g-ray imaging. The good properties for the scintillating crystals used in these applications require high photon yield, high stopping power, good energy resolution, good light yield proportionality, and minimal afterglow. The main useful of Ce-doped Lu0.7Y0.3AlO3 (LuYAP(Ce)) are high stopping power and non-hygroscopic which are expected to be key ingredients for medical imaging. In this work, we studied the light yield non-proportionality and energy resolution of LuYAP(Ce) crystal with the energy range from 31 to 1,274.5 keV using photomultiplier tube (PMT) readout. The intrinsic resolution of the LuYAP(Ce) crystal has been determined after correcting the measured PMT resolution. The results showed that the non-proportional response of the crystals was strongly correlated with the intrinsic resolution of the crystals.

Energy resolution of gamma-ray spectroscopy of JET plasmas with a LaBr3 scintillator detector and digital data acquisition

2010 ◽  
Vol 81 (10) ◽  
pp. 10D321 ◽  
Author(s):  
M. Nocente ◽  
M. Tardocchi ◽  
I. Chugunov ◽  
R. C. Pereira ◽  
T. Edlington ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Energy Resolution ◽  
Gamma Ray ◽  
Digital Data ◽  
Gamma Ray Spectroscopy ◽  
Digital Data Acquisition ◽  
Scintillator Detector
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