9 September 2014 Strontium iodide instrument development for gamma spectroscopy and radioisotope identification
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Development of the Europium-doped Strontium Iodide scintillator, SrI2(Eu2+), has progressed significantly in recent years. SrI2(Eu2+) has excellent material properties for gamma ray spectroscopy: high light yield (<80,000 ph/MeV), excellent light yield proportionality, and high effective atomic number (Z = 49) for high photoelectric cross-section. High quality 1.5” and 2” diameter boules are now available due to rapid advances in SrI2(Eu) crystal growth. In these large SrI2(Eu) crystals, optical self-absorption by Eu2+ degrades the energy resolution as measured by analog electronics, but we mitigate this effect through on-the-fly correction of the scintillation pulses by digital readout electronics. Using this digital correction technique we have demonstrated energy resolution of 2.9% FWHM at 662 keV for a 4 in3 SrI2(Eu) crystal, over 2.6 inches long. Based on this digital readout technology, we have developed a detector prototype with greatly improved radioisotope identification capability compared to Sodium Iodide, NaI(Tl). The higher resolution of SrI2(Eu) yields a factor of 2 to 5 improvement in radioisotope identification (RIID) error rate compared to NaI(Tl).
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P. R. Beck, P. R. Beck, N. J. Cherepy, N. J. Cherepy, S. A. Payne, S. A. Payne, E. L. Swanberg, E. L. Swanberg, K. E. Nelson, K. E. Nelson, P. A. Thelin, P. A. Thelin, S. E. Fisher, S. E. Fisher, S. Hunter, S. Hunter, B. M. Wihl, B. M. Wihl, K. S. Shah, K. S. Shah, R. Hawrami, R. Hawrami, A. Burger, A. Burger, L. A. Boatner, L. A. Boatner, M. Momayezi, M. Momayezi, K. T. Stevens, K. T. Stevens, M. H. Randles, M. H. Randles, D. Solodovnikov, D. Solodovnikov, } "Strontium iodide instrument development for gamma spectroscopy and radioisotope identification", Proc. SPIE 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI, 92130N (9 September 2014); doi: 10.1117/12.2063056; https://doi.org/10.1117/12.2063056

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