부산대학교 도서관

Development of the Europium-doped Strontium Iodide scintillator, ${\rm SrI}_{2}{\rm (Eu)}$, involves advances in crystal growth, optics and readout methodology for prototype detectors. We have demonstrated energy resolution of 3% at 662 keV for a $26~{\rm cm}^{3}~{\rm SrI}_{2}{\rm (Eu)}$ crystal, which is equivalent to the performance obtained with Cerium-doped Lanthanum Bromide of equivalent size. Compared to standard analog readout, use of a digital readout method allows improved energy resolution to be obtained with large volume ${\rm SrI}_{2}{\rm (Eu)}$ crystals. Comparative gamma spectra acquired with ${\rm LaBr}_{3}{\rm (Ce)}$ and NaI(Tl) quantitatively depict the value of the high resolution of ${\rm SrI}_{2}{\rm (Eu)}$ in discriminating closely spaced gamma lines for radioisotope identification applications.