Effects of packaging SrI2(Eu) scintillator crystals

Development of transparent ceramic Ce-doped gadolinium garnet gamma spectrometers

“…This is well-documented for the single crystal scintillator, SrI 2 (Eu) [9][10][11]. In contrast to SrI 2 (Eu), self-absorption by Ce in GYGAG(Ce) results in redshifting of the emission that diminishes the quantum efficiency of conversion with PMT readout, due to the loss in bialkali photocathode sensitivity at longer wavelengths.…”

“…Previous studies have detailed the effect of optical light trapping and methods for mitigation for Eu-doped Strontium Iodide [9][10][11]18], however, that scintillator emits in the blue, where PMT quantum efficiency (QE) is high and nearly invariant. In contrast, between 475 and 650 nm, the PMT QE decreases by a factor of about 4, thus the net result of the light trapping and red-shifting emission as a function of size is decreased effective light yield, as well as position dependent GYGAG(Ce) ceramic fabricated at LLNL, using silicon photodiode readout.…”

Performance of europium-doped strontium iodide, transparent ceramics and bismuth-loaded polymer scintillators

“…Crystals from all three growers have offered similar performance. Eu-doped crystals are cut into a tapered cylinder shape, while undoped SrI 2 crystals are used as right cylinders, polished and encapsulated in an aluminum cans at LLNL [12].…”

Comparative gamma spectroscopy with SrI<inf>2</inf>(Eu), GYGAG(Ce) and Bi-loaded plastic scintillators

“…The crystal characterized in this report was grown at RMD, then packaged at LLNL. The crystal was cut into a tapered cylinder, polished and encapsulated in an aluminum can [7].…”

“…The large value of B for NaI(Tl) is thought to be due to its intrinsic non-proportionality. The much smaller value for SrI 2 (Eu) likely results from light trapping, which may be addressed by careful optical design [13,7]. The origin of B value for GYGAG(Ce) is under investigation.…”