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Neutron Detection Using Gadolinium-Based Diodes by Benjamin R Thomas (Paperback / softback, 2012)

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P-n heterojunction diodes consisting of a thin n-type layer of Gd O deposited on both p-type Si and p-type 4H SiC substrates were explored as possible solid-state neutron detectors. 79 keV internal conversion electrons from the de-excitation of the meta-stable Gd-158 nucleus can create ionization in the depletion region of the reverse-biased diodes resulting in a detectable signal. The diodes were modeled with Davinci software to determine the feasibility of signal detection above the reverse-bias leakage current. A CASINO simulation showed that less than one percent of the internal conversion electrons deposit their full energy within the achievable depletion region. After depositing contacts on samples prepared at the University of Nebraska, Lincoln, the diodes were exposed to thermal neutron fluxes of approximately 10 n/cm s in the AFIT Standard Graphite Pile and 10 n/cm s in the thermal column of the Ohio State University Research Reactor. Pulse height spectra collected during irradiations at various reverse bias voltages ranging from - 0.5 V to -5.0 V revealed discernable neutron induced features. Oscilloscope traces captured during the high thermal neutron flux irradiations show pulses; however, evidence exists to attribute these pulses to neutron interactions.

Product Identifiers

PublisherBiblioscholar
ISBN-101288285701
ISBN-139781288285709
eBay Product ID (ePID)148742361

Product Key Features

TypeTextbook
FormatTrade Paperback (Us) ,Unsewn / Adhesive Bound, Paperback / Softback
LanguageEnglish
AuthorBenjamin R Thomas
SubjectEducation & Teaching

Dimensions

Height246mm
Width189mm
Weight204g

Additional Product Features

Date of Publication12/11/2012
Spine6mm
Out-Of-Print Date26/02/2013
Country of PublicationUnited States
GenreEducation & Teaching