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Title: Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals

Abstract

In this study, LiAlO2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6 % 6Li, a 10 mm Ø by 10 mm sample of LiAlO2 has a 70.7 % intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390416
Report Number(s):
PNNL-SA-121859
Journal ID: ISSN 0022-2313
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Luminescence; Journal Volume: 190; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Dickens, Peter T., Marcial, José, McCloy, John, McDonald, Benjamin S., and Lynn, Kelvin G. Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals. United States: N. p., 2017. Web. doi:10.1016/j.jlumin.2017.05.047.
Dickens, Peter T., Marcial, José, McCloy, John, McDonald, Benjamin S., & Lynn, Kelvin G. Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals. United States. doi:10.1016/j.jlumin.2017.05.047.
Dickens, Peter T., Marcial, José, McCloy, John, McDonald, Benjamin S., and Lynn, Kelvin G. Sun . "Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals". United States. doi:10.1016/j.jlumin.2017.05.047.
@article{osti_1390416,
title = {Spectroscopic and neutron detection properties of rare earth and titanium doped LiAlO 2 single crystals},
author = {Dickens, Peter T. and Marcial, José and McCloy, John and McDonald, Benjamin S. and Lynn, Kelvin G.},
abstractNote = {In this study, LiAlO2 crystals doped with rare-earth elements and Ti were produced by the CZ method and spectroscopic and neutron detection properties were investigated. Photoluminescence revealed no clear luminescent activation of LiAlO2 by the rare-earth dopants though some interesting luminescence was observed from secondary phases within the crystal. Gamma-ray pulse height spectra collected using a 137Cs source exhibited only a Compton edge for the crystals. Neutron modeling using Monte Carlo N-Particle Transport Code revealed most neutrons used in the detection setup are thermalized, and while using natural lithium in the crystal growth, which contains 7.6 % 6Li, a 10 mm Ø by 10 mm sample of LiAlO2 has a 70.7 % intrinsic thermal neutron capture efficiency. Furthermore, the pulse height spectra collected using a 241Am-Be neutron source demonstrated a distinct neutron peak.},
doi = {10.1016/j.jlumin.2017.05.047},
journal = {Journal of Luminescence},
number = C,
volume = 190,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}