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Prospects for High Energy Resolution Gamma Ray Spectroscopy with Europium-Doped Strontium Iodide

  • Nerine Cherepy (a1), S A. Payne (a2), Rastgo Hawrami (a3), A Burger (a4), Lynn Boatner (a5), Edgar Van Loef (a6) and Kanai Shah (a7)...

Europium-doped strontium iodide scintillators offer a light yield exceeding 100,000 photons/MeV and excellent light yield proportionality, while at the same time, SrI2 is readily grown in single crystal form. Thus far, our collaboration has demonstrated an energy resolution with strontium iodide of 2.6% at 662 keV and 7.6% at 60 keV, and we have grown single crystals surpassing 30 cm3 in size (with lower resolution). Our analysis indicates that SrI2(Eu) has the potential to offer 2% energy resolution at 662 keV with optimized material, optics, and read-out. In particular, improvements in feedstock purity may result in crystal structural and chemical homogeneity, leading to improved light yield uniformity throughout the crystal volume, and consequently, better energy resolution. Uniform, efficient light collection and detection, is also required to achieve the best energy resolution with a SrI2(Eu) scintillator device.

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1. R. Hofstadter E. W. O'Dell , and S. T. Schmidt IEEE Trans. Nucl. Sci. NS-11, p. 12 (1964).

3. N.J. Cherepy G. Hull T.R. Niedermayr A. Drobshoff S.A. Payne U.N. Roy Y. Cui A. Bhattacharaya M. Harrison M. Guo M. Groza A. Burger Barium iodide single-crystal scintillator detectors,” Proc. SPIE, vol. 6706, p. 670616 (2007).

4. J. Selling M.D. Birowosuto P. Dorenbos S. Schweizer Europium-doped barium halide scintillators for x-ray and ã-ray detections,” J. Appl. Phys., vol. 101, p.034901, (2007).

5. N.J. Cherepy G. Hull A. Drobshoff S.A. Payne E. van Loef , C. Wilson K. Shah U.N. Roy A. Burger L.A. Boatner W-S Choong , W.W. Moses Strontium and Barium Iodide High Light Yield Scintillators,” Appl. Phys. Lett. vol. 92, p. 083508, (2008).

6. R. Hawrami M. Groza Y. Cui , A. Burger M.D Aggarwal , N. Cherepy and S.A. Payne SrI2 a Novel Scintillator Crystal for Nuclear Isotope Identifiers,” Proc. SPIE, Vol. 7079, 70790 (2008).

7. CM Wilson , EV Van Loef , J. Glodo N. Cherepy G. Hull SA Payne , W.-S. Choong , WW Moses , KS Shah , “Strontium iodide scintillators for high energy resolution gamma ray spectroscopy,” Proc. SPIE, Vol. 7079, 707917, (2008).

10. G. Hull S. Du T. Niedermayr S. Payne N. Cherepy A. Drobshoff and L. Fabris Light Collection Optimization in Scintillator Based Gamma-Ray Spectrometers,” Nucl. Instr. Meth. A, vol. 588, p. 384, 2008.

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  • EISSN: 1946-4274
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