Share Email Print

Proceedings Paper

Improving NaI:TI with non-luminescent cation co-doping (Conference Presentation)
Author(s): Kan Yang; Peter R. Menge
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Thallium activated sodium iodide (NaI:Tl) is one of the most widely used gamma-ray scintillators. Commercially available NaI:Tl scintillators are typically characterized by a gamma-ray energy resolution of 6.5% at 662 keV and a scintillation decay time constant of 230 ns. Energy resolution, non-proportionality and scintillation decay time are improved when the crystal is co-doped with alkaline earth metals. The energy resolution of NaI:Tl+ is improved to 5.3% and the decay time is simultaneously reduced to 170 ns with Sr or Ca co-doping. The improvement in energy resolution, non-proportionality and decay time is likely due to the suppression of slow scintillation processes in NaI:Tl. We also demonstrated that Li+ can be substantially incorporated into the matrix of NaI under an optimized crystal growth process. The incorporation of Li+ introduces efficient neutron detection capability into an already successful gamma scintillator. Single crystals of Li co-doped NaI show similar gamma performance as standard NaI:Tl. Exceptional gamma-neutron pulse shape discrimination (PSD) has been demonstrated in all Li co-doped NaI crystals with up to 8% Li concentration. PSD Figure-of-Merits are up to 4.4 depending on Li content.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII, 99680F (2 November 2016); doi: 10.1117/12.2238175
Show Author Affiliations
Kan Yang, Saint-Gobain Crystals (United States)
Peter R. Menge, Saint-Gobain Crystals (United States)

Published in SPIE Proceedings Vol. 9968:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII
Ralph B. James; Michael Fiederle; Arnold Burger; Larry Franks, Editor(s)

© SPIE. Terms of Use
Back to Top