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Nonproportional Response and Energy Resolution of Pure SrI _{2} and SrI _{2} :5%Eu Scintillators

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4 Author(s)
Mikhail S. Alekhin ; Faculty of Applied Sciences, Delft University of Technology, The Netherlands ; Ivan V. Khodyuk ; Johan T. M. de Haas ; Pieter Dorenbos

Nonproportional response of the scintillation yield of un-doped SrI2 and SrI2:5o/oEu was studied using highly monochromatic synchrotron irradiation ranging from 10.5 to 100 keV. Measurements were performed at 80 K and 295 K for SrI , and at 80 K, 295 K, 450 K, and 600 K for SrI2:5o/oEu. By making a dense data sampling around the iodine K-edge and using the recently developed K-dip spectroscopy method, the K-shell photoelectron response curves were reconstructed down to 500 eV. Proportionalities of X-ray response and K-shell photoelectron response of both crystals reveal temperature dependence. Energy resolution of the X-ray photopeak was analyzed as a function of temperature and deposited energy. Energy resolution improves with better proportionality.

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IEEE Transactions on Nuclear Science  (Volume:59 ,  Issue: 3 )