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28 October 2014 Scintillation properties of strontium iodide doped with europium for high-energy astrophysical detectors: nonproportionality as a function of temperature and at high gamma-ray energies
Rose Schmitt Perea, Ann M. Parsons, Michael Groza, David Caudel, Suzanne F. Nowicki, Arnold Burger, Keivan G. Stassun, Todd E. Peterson
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Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 1, Issue 1, 016002 (October 2014). https://doi.org/10.1117/1.JATIS.1.1.016002
Abstract
Strontium iodide doped with europium [SrI2(Eu2+)] is a new scintillator material being developed as an alternative to lanthanum bromide doped with cerium [LaBr3(Ce3+)] for use in high-energy astrophysical detectors. As with all scintillators, the issue of nonproportionality is important because it affects the energy resolution of the detector. We investigate how the nonproportionality of SrI2(Eu2+) changes as a function of temperature from 16 to 60°C by heating the SrI2(Eu2+) scintillator separate from the photomultiplier tube. In a separate experiment, we also investigate the nonproportionality at high energies (up to 6 MeV) of SrI2(Eu2+) at a testing facility located at NASA Goddard Space Flight Center. We find that the nonproportionality increases nearly monotonically as the temperature of the SrI2(Eu2+) scintillator is increased, although there is evidence of nonmonotonic behavior near 40°C, perhaps due to electric charge carriers trapping in the material. We also find that within the energy range of 662 keV to 6.1 MeV, the change in the nonproportionality of SrI2(Eu2+) is ∼1.5 to 2%.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Rose Schmitt Perea, Ann M. Parsons, Michael Groza, David Caudel, Suzanne F. Nowicki, Arnold Burger, Keivan G. Stassun, and Todd E. Peterson "Scintillation properties of strontium iodide doped with europium for high-energy astrophysical detectors: nonproportionality as a function of temperature and at high gamma-ray energies," Journal of Astronomical Telescopes, Instruments, and Systems 1(1), 016002 (28 October 2014). https://doi.org/10.1117/1.JATIS.1.1.016002
Published: 28 October 2014
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Cited by 3 scholarly publications and 1 patent.
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KEYWORDS
Scintillators
Sensors
Gamma radiation
Scintillation
Europium
Astronomical detectors
Strontium
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