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

• Published in: IEEE transactions on nuclear science Vol. 59; no. 3; pp. 665 - 670
• Main Authors: Alekhin, Mikhail S, Khodyuk, Ivan V, de Haas, Johan TM, Dorenbos, Pieter
• Format: Journal Article
• Language: English
• Published: 01-06-2012
• Subjects: Crystals; Deposition; Energy resolution; Photoelectrons; Photopeak; Synchrotrons; Temperature dependence; X-rays
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/TNS.2012.2188544

Nonproportional response of the scintillation yield of un-doped SrI 2 and SrI 2 :5%Eu 2 + 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 2 , and at 80 K, 295 K, 450 K, and 600 K for SrI 2 :5%Eu. 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.