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Proceedings Paper

Rare-earth tri-halides methanol-adduct single-crystal scintillators for gamma ray and neutron detection
Author(s): L. A. Boatner; D. J. Wisniewski; J. S. Neal; Z. W. Bell; J. O. Ramey; J. A. Kolopus; B. C. Chakoumakos; R. Custelcean; M. Wisniewska; K. E. Pena
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Paper Abstract

Cerium activated rare-earth tri- halides represent a well-known family of high performance inorganic rare-earth scintillators - including the high-light-yield, high-energy-resolution scintillator, cerium-doped lanthanum tribromide. These hygroscopic inorganic rare-earth halides are currently grown as single crystals from the melt - either by the Bridgman or Czochralski techniques - slow and expensive processes that are frequently characterized by severe cracking of the material due to anisotropic thermal stresses and cleavage effects. We have recently discovered a new family of cerium-activated rare-earth metal organic scintillators consisting of tri-halide methanol adducts of cerium and lanthanum - namely CeCl3(CH3OH)4 and LaBr3(CH3OH)4:Ce. These methanol-adduct scintillator materials can be grown near room temperature from a methanol solution, and their high solubility is consistent with the application of the rapid solution growth methods that are currently used to grow very large single crystals of potassium dihydrogen phosphate. The structures of these new rare-earth metal-organic scintillating compounds were determined by single crystal x-ray refinements, and their scintillation response to both gamma rays and neutrons, as presented here, was characterized using different excitation sources. Tri-halide methanol-adduct crystals activated with trivalent cerium apparently represent the initial example of a solution-grown rare-earth metal-organic molecular scintillator that is applicable to gamma ray, x-ray, and fast neutron detection.

Paper Details

Date Published: 11 September 2009
PDF: 12 pages
Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 74491E (11 September 2009); doi: 10.1117/12.829187
Show Author Affiliations
L. A. Boatner, Oak Ridge National Lab. (United States)
D. J. Wisniewski, Oak Ridge National Lab. (United States)
J. S. Neal, Oak Ridge National Lab. (United States)
Z. W. Bell, Oak Ridge National Lab. (United States)
J. O. Ramey, Oak Ridge National Lab. (United States)
J. A. Kolopus, Oak Ridge National Lab. (United States)
B. C. Chakoumakos, Oak Ridge National Lab. (United States)
R. Custelcean, Oak Ridge National Lab. (United States)
M. Wisniewska, Oak Ridge National Lab. (United States)
K. E. Pena, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 7449:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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