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Proceedings Paper

Characteristics of the stacked microstructured solid state neutron detector
Author(s): S. L. Bellinger; R. G. Fronk; W. J. McNeil; J. K. Shultis; T. J. Sobering; D. S. McGregor
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Paper Abstract

Silicon diodes with large aspect ratio perforated microstructures backfilled with 6LiF show a dramatic increase in neutron detection efficiency beyond that of conventional thin-film coated planar devices. Described in this work are advancements in the technology with increased microstructure depths and detector stacking methods that work to increase thermal-neutron detection efficiency. Models for ion energy deposition and intrinsic thermal-neutron detection efficiency for the straight trench design are described and results presented. A dual stacked device was fabricated by coupling two detectors back-to-back, along with counting electronics, into a single detector. Experimentally verified results and modeled predictions are compared. The stacked device delivered 37% intrinsic thermal-neutron detection efficiency, lower than the predicted value of 47%. It was determined that this lower observed efficiency is due to detector misalignment in the stacked structure and ballistic deficit from slow charge collection from the deep trench structures. The intrinsic thermal-neutron detection efficiency depends strongly upon the geometry, size, and depth of the perforated microstructures. This work is part of on-going research to develop solid-state semiconductor neutron detectors with high detection efficiencies.

Paper Details

Date Published: 20 September 2010
PDF: 16 pages
Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 78050N (20 September 2010); doi: 10.1117/12.863603
Show Author Affiliations
S. L. Bellinger, Kansas State Univ. (United States)
R. G. Fronk, Kansas State Univ. (United States)
W. J. McNeil, Kansas State Univ. (United States)
J. K. Shultis, Kansas State Univ. (United States)
T. J. Sobering, Kansas State Univ. (United States)
D. S. McGregor, Kansas State Univ. (United States)

Published in SPIE Proceedings Vol. 7805:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
Arnold Burger; Larry A. Franks; Ralph B. James, Editor(s)

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