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Gadolinium Oxide / Silicon Thin Film Heterojunction Solid-State Neutron Detector
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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The internal conversion electron emission from the de-excitation of the Gd-158m nucleus was explored as a means for neutron detection. Thin film gadolinium oxide Gd2O3 and p-type silicon heterojunction diodes were produced using a supercritical water deposition process. Pulse height spectroscopy was conducted on the novel diodes while they were subjected to a moderated plutonium-beryllium PuBe source flux of 104 thermal neutronscm2s. Coincident gamma spectroscopy was employed to verify the 1107.6 keV photon emissions from the diode indicative of successful neutron capture by Gd-157 and the subsequent de-excitation of the Gd-158m nucleus. Neutron capture in the diodes could not be confirmed experimentally. The diodes were found to be sensitive to gamma rays between 10 and 20 keV.
APPROVED FOR PUBLIC RELEASE