Accession Number : AD0289692

Title :   THE DEVELOPMENT OF THE SILICON-JUNCTION FASTNEUTRON DOSIMETER FOR APPLICATION IN THE RADIATION-EFFECTS TESTING RANGE

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO

Personal Author(s) : MENGALI,O.J. ; CLOSSER,W.H. ; GORTON,H.C.

Report Date : SEP 1962

Pagination or Media Count : 1

Abstract : Experimental silicon-junction fast-neutron dosimeters were prepared with crystal type, base width, surface work damage, and a process modification to increase initial charge-carrier lifetime as variable parameters. Examination of the preirradiation characteristics of the devices revealed several unexpected effects related to the material and process variables. To accurately determine the neutron exposure of the experimental dosimeters, a complete independent calibration was made of the flux spectrum of the reactor at the core position used in the irradiations. Six fission foils and threshold detectors with threshold energies from 4 kev to 6.9 mev were used. In115 foils and S32 pellets were included with the experimental dosimeters in each of the irradiations. The narrower base devices were shown to be much less sensitive to fast-neutron irradiation than the wider base devices. Although the sensitivity of the device to irradiation was not linear, the nonlinearity was generally less than 20% from 10 to the 12th power to at least 10 to the 13th power nvt. It was observed that neither surface treatment nor lifetime retention process had a significant effect on the sensitivity of the devices. (Author)

Descriptors :   *DOSIMETERS, *FAST NEUTRONS, *NEUTRON DETECTORS, CHEMICAL MILLING, DIFFUSION, NUCLEAR REACTIONS, RADIATION EFFECTS, RADIATION MEASUREMENT SYSTEMS COMPONENTS, SEMICONDUCTORS, SILICON, SOLID STATE PHYSICS, SURFACE PROPERTIES, ZONE MELTING

Distribution Statement : APPROVED FOR PUBLIC RELEASE