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Title: Cerium-doped Mixed-Alkali Rare-Earth Double-Phosphate Scintillators for Thermal Neutron Detection

Authors:
 [1];  [1];  [2];  [3];  [2]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. Siemens Medical Solutions, Knoxville
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
970863
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment; Journal Volume: 579
Country of Publication:
United States
Language:
English

Citation Formats

Neal, John S, Boatner, Lynn A, Spurrier, Merry, Szupryczynski, Piotr, and Melcher, Charles L. Cerium-doped Mixed-Alkali Rare-Earth Double-Phosphate Scintillators for Thermal Neutron Detection. United States: N. p., 2007. Web. doi:10.1016/j.nima.2007.04.005.
Neal, John S, Boatner, Lynn A, Spurrier, Merry, Szupryczynski, Piotr, & Melcher, Charles L. Cerium-doped Mixed-Alkali Rare-Earth Double-Phosphate Scintillators for Thermal Neutron Detection. United States. doi:10.1016/j.nima.2007.04.005.
Neal, John S, Boatner, Lynn A, Spurrier, Merry, Szupryczynski, Piotr, and Melcher, Charles L. Mon . "Cerium-doped Mixed-Alkali Rare-Earth Double-Phosphate Scintillators for Thermal Neutron Detection". United States. doi:10.1016/j.nima.2007.04.005.
@article{osti_970863,
title = {Cerium-doped Mixed-Alkali Rare-Earth Double-Phosphate Scintillators for Thermal Neutron Detection},
author = {Neal, John S and Boatner, Lynn A and Spurrier, Merry and Szupryczynski, Piotr and Melcher, Charles L},
abstractNote = {},
doi = {10.1016/j.nima.2007.04.005},
journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 579,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • X-ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII, Proceedings of the SPIE. Vol. 6319, 631907 (2006).
  • When activated with an appropriate rare-earth ion (e.g., Ce or Nd), rare-earth orthophosphates of the form REPO4 (where RE = a rare-earth cation) and alkali rare-earth double phosphates of the form A{sub 3}RE(PO{sub 4}){sub 2} (where A = K, Rb, or Cs) are characterized by light yields and decay times that make these materials of interest for radiation-detection applications. Crystals of the compound Rb{sub 3}Lu(PO{sub 4}){sub 2} when activated with {approx}0.1 mol % Ce exhibit a light yield that is {approx}250% that of BGO with a decay time on the order of {approx}40 nsec. The cerium-activated rare-earth orthophosphate LuPO{sub 4}:Cemore » is also characterized by a high light yield and a relatively fast decay time of {approx}25 nsec. Additionally, the rare-earth orthophosphates are extremely chemically, physically, and thermally durable hosts that recover easily from radiation damage effects. The properties of the rare-earth orthophosphates and double phosphates that pertain to their use as X- and gamma-ray detectors are reviewed. This review includes information related to the use of Nd-doped LuPO{sub 4} as a scintillator with a sufficiently energetic, short-wavelength output ({lambda} = 90 nm) so that it can be used in conjunction with appropriately activated proportional counters. Information is presented on the details of the synthesis, structure, and luminescence properties of lanthanide double phosphates that, when activated with cerium, are efficient scintillators with output wavelengths that are sufficiently long to be well matched to the response of silicon photodiode detectors.« less
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  • 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 10more » 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.« less
  • In this study, LiAlO 2 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 LiAlO 2 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, amore » 10 mm Ø by 10 mm sample of LiAlO 2 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.« less