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Proceedings Paper

Wavelength-shifting fiber readout of LaCl3 and LaBr3 scintillators
Author(s): Gary L. Case; Michael L. Cherry; J. Gregory Stacy; Christopher E. Welch
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Paper Abstract

Inorganic scintillators such as NaI(Tl) and CsI(Na) have been used extensively in hard x-ray and low-energy gamma-ray imaging systems. Recently, a new generation of scintillators has been developed with properties that could greatly enhance the performance of such imaging systems. In particular, the lanthanum halides show great promise with increased light yield and peak emission at shorter wavelengths compared to NaI or CsI. Since these scintillators emit at relatively short wavelengths, wavelength-shifting fibers can be used which re-emit at wavelengths around 420 nm, providing a good match to bialkali photocathode response. Multi-anode photomultiplier tubes can be used to read out individual fibers from orthogonal layers to provide x-y position information, while energy measurements can be made by large area photomultiplier tubes. Such an arrangement potentially provides improved overall position and energy resolution and lower thresholds compared to imaging systems configured as standard NaI or CsI gamma cameras. We present measurements of the energy resolution obtained from lanthanum chloride (LaCl3) and lanthanum bromide (LaBr3) scintillators viewed both perpendicular to the axis and down the length of square multi-clad wavelength-shifting fibers. These results are compared to a standard NaI detector with wavelength-shifting fibers. The implications of these results for gamma-ray imaging will then be discussed.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980K (18 August 2005); doi: 10.1117/12.617796
Show Author Affiliations
Gary L. Case, Southern Univ. (United States)
Louisiana State Univ. (United States)
Michael L. Cherry, Louisiana State Univ. (United States)
J. Gregory Stacy, Southern Univ. (United States)
Louisiana State Univ. (United States)
Christopher E. Welch, Louisiana State Univ. (United States)

Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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