Thin film CdTe based neutron detectors with high thermal neutron efficiency and gamma rejection for security applications

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• 作者：L. Smith^a ; J.W. Murphy^a ; J. Kim^b ; S. Rozhdestvenskyy^a ; I. Mejia^a ; H. Park^b ; D.R. Allee^c ; M. Quevedo-Lopez^a ; B. Gnade^a ; ^{beg031000@utdallas.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Neutron detection ; Semiconductor radiation detectors ; CdTe ; Low cost detection methods
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：838
• 期：Complete
• 页码：117-123
• 全文大小：1551 K

文摘

Solid-state neutron detectors offer an alternative to ³He based detectors, but suffer from limited neutron efficiencies that make their use in security applications impractical. Solid-state neutron detectors based on single crystal silicon also have relatively high gamma-ray efficiencies that lead to false positives. Thin film polycrystalline CdTe based detectors require less complex processing with significantly lower gamma-ray efficiencies. Advanced geometries can also be implemented to achieve high thermal neutron efficiencies competitive with silicon based technology. This study evaluates these strategies by simulation and experimentation and demonstrates an approach to achieve >10% intrinsic efficiency with <10⁻⁶ gamma-ray efficiency.