SrI 2 scintillator for gamma ray spectroscopy

Cherepy, Nerine J.; Sturm, Benjamin W.; Drury, Owen B.; Hurst, T. A.; Sheets, S. A.; Ahle, L.; Saw, C. K.; Pearson, Mark; Payne, Stephen A.; Bürger, A.; Boatner, L. A.; Ramey, J. O.; Loef, E.V.D. van; Głodo, J.; Hawrami, R.; Higgins, William E.; Shah, K.S.; Moses, W.W.

doi:10.1117/12.830016

Cited by 40 publications

(23 citation statements)

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“…Therefore, the 2.2 eV PL emission band can correspond to appearance of crystal hydrates which are products of interaction between the SrI 2 :Eu 2+ surface and water. The forming of such hydrates was confirmed by independent X-ray diffraction studies [14].…”

Section: Resultsmentioning

confidence: 55%

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A luminescence spectroscopy study of scintillation crystals SrI2 doped with Eu2+

et al. 2012

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We report experimental study of luminescent properties of modern scintillation material SrI 2 :Eu 2+ carried out over the temperature range from 9 to 450 K by the means of the ultraviolet and vacuum ultraviolet spectroscopy with a time resolution. Photoluminescence of the Eu 2+ ions at 2.85 eV was studied under both the intracenter and interband excitations, including an X-ray excitation. The bandgap of the SrI 2 crystal has been estimated on the basis of the obtained results. In the temperature range below 100 K the intrinsic luminescence at 3.4 eV was revealed and this emission band was assigned by its properties to the luminescence of selftrapped anionic excitons in SrI 2 . The pronounced manifestation of the effect of multiplication of electronic excitations was revealed in the energy range above 2E g .

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Section: Resultsmentioning

confidence: 55%

“…The residual gases can interact with the crystal surface. Cherepy et al showed that the main products of this interaction are in the form of hydrates [14]. If the 2.2 eV luminescence is due to the hydrates, then its intensity should correlate with concentration of these hydrates.…”

Section: Resultsmentioning

confidence: 99%

A luminescence spectroscopy study of scintillation crystals SrI2 doped with Eu2+

et al. 2012

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“…Some properties of the SrI 2 (Eu) scintillator that make it desirable for gamma-ray detection include: a high light yield of ~90,000 photons/MeV, excellent light yield proportionality, an emission band of 410-450 nm that is well-matched to bialkali PMTs, and no intrinsic radioactivity [2][3][4][5]. Small SrI 2 (Eu) crystals of ~1 cm 3 in volume have demonstrated <2.7% resolution at 662 keV [6]. Until recently, large crystals with volumes >10 cm 3 generally provided poorer resolution.…”

Section: Introductionmentioning

confidence: 99%

“…Small SrI 2 (Eu) crystals of ~1 cm 3 in volume have demonstrated <2.7% resolution at 662 keV [6]. Until recently, large crystals with volumes >10 cm 3 generally provided poorer resolution. This paper focuses on how the optical light trapping effect, due to re-absorption and re-emission by Eu in the crystal, can be mitigated by proper geometry and optical design.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

Sturm

Cherepy

Drury

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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Abstract-There is an ever increasing demand for gamma-ray detectors which can achieve good energy resolution, high detection efficiency, and room-temperature operation. We are working to address each of these requirements through the development of large volume SrI 2 (Eu) scintillator detectors. In this work, we have evaluated a variety of SrI 2 crystals with volumes >10 cm 3 . The goal of this research was to examine the causes of energy resolution degradation for larger detectors and to determine what can be done to mitigate these effects. Testing both packaged and unpackaged detectors, we have consistently achieved better resolution with the packaged detectors. Using a collimated gamma-ray source, it was determined that better energy resolution for the packaged detectors is correlated with better light collection uniformity. A number of packaged detectors were fabricated and tested and the best spectroscopic performance was achieved for a 3% Eu doped crystal with an energy resolution of 2.93% FWHM at 662keV. Simulations of SrI 2 (Eu) crystals were also performed to better understand the light transport physics in scintillators and are reported. This study has important implications for the development of SrI 2 (Eu) detectors for national security purposes.

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“…This would lead to a scintillator with a resolution comparable to or better than that of a semiconductor, while less expensive to manufacture and with the capacity to grow much larger single crystals and, therefore, build more efficient detectors compared to those fabricated from semiconductors. 7 Improving the energy resolution of SrI 2 ðEu 2þ Þ requires characterizing and better understanding the nonproportionality of the material's light yield. Indeed, some calculations show that, should nonproportionality be minimized, SrI 2 ðEu 2þ Þ would achieve a fundamental Poisson limit of 1.5% energy resolution.…”

Section: Introductionmentioning

confidence: 99%

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

Perea

Parsons

Groza

et al. 2014

J. Astron. Telesc. Instrum. Syst

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Abstract. Strontium iodide doped with europium [SrI 2 ðEu2þ Þ] is a new scintillator material being developed as an alternative to lanthanum bromide doped with cerium [LaBr 3 ðCe 3þ Þ] 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 SrI 2 ðEu 2þ Þ changes as a function of temperature from 16 to 60°C by heating the SrI 2 ðEu 2þ Þ scintillator separate from the photomultiplier tube. In a separate experiment, we also investigate the nonproportionality at high energies (up to 6 MeV) of SrI 2 ðEu 2þ Þ at a testing facility located at NASA Goddard Space Flight Center. We find that the nonproportionality increases nearly monotonically as the temperature of the SrI 2 ðEu 2þ Þ 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 SrI 2 ðEu 2þ Þ is ∼1.5 to 2%. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 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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SrI 2 scintillator for gamma ray spectroscopy

Cited by 40 publications

References 0 publications

A luminescence spectroscopy study of scintillation crystals SrI2 doped with Eu2+

A luminescence spectroscopy study of scintillation crystals SrI2 doped with Eu2+

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

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

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