Abstract
Europium-doped Strontium Iodide (SrI) scintillation gamma detectors have only recently become commercially available. SrI has very high light output ranging from 80,000-100,000 ph/MeV and energy resolution as good as 2.9% at 662 keV and 14.8% at 32 keV. The high density of 4.6 g/cc in combination with a high effective Atomic number and the absence of internal activity make SrI a very attractive sensor material for spectroscopic radiation monitoring devices. This new entrant into the field of commercially available gamma spectroscopy detectors offers improved energy resolution over NaI, without the elevated background of LaBr. While CZT and HPGe detectors have better resolution, the small available size of CZT and the cooling requirement of HPGe limit their usefulness in portable applications. Of these scintillators, SrI2 has the lowest detection limits when compared to other equal- size scintillation detectors, especially at low energies where U and Pu are of interest.
Highlights
Strontium Iodide was originally explored as a potential enhanced-resolution radiation detector by R
Strontium Iodide was largely ignored until ~2008 when scientists at Lawrence Livermore National Laboratory resurrected that effort and headed the research into enhanced-resolution scintillation detectors
That effort has led to the availability of large-size good quality commercially available scintillators made from Europium-doped Strontium Iodide (SrI2:Eu), hereafter abbreviated SrI
Summary
Strontium Iodide was originally explored as a potential enhanced-resolution radiation detector by R. He expected promising results the doping methods and crystal purity available at that time did not give satisfactory results. Strontium Iodide was largely ignored until ~2008 when scientists at Lawrence Livermore National Laboratory resurrected that effort and headed the research into enhanced-resolution scintillation detectors. That effort has led to the availability of large-size good quality commercially available scintillators made from Europium-doped Strontium Iodide (SrI2:Eu), hereafter abbreviated SrI
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