Accession Number : AD0614109

Title :   DEVELOPMENT AND APPLICATION OF NUCLEAR MEASUREMENT TECHNIQUES.

Descriptive Note : Technical rept. for 1 Oct 63-30 Sep 64,

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : Dungan,W. E. ; Miles,J. K. ; Bell,J. R.

Report Date : MAR 1965

Pagination or Media Count : 78

Abstract : A study program was performed on the selection of high-temperature materials for use as passive neutronfield-measuring devices and of thermal-neutron shields for use in extreme nonnuclear environments. Seventeen candidate materials were investigated from which four compounds were selected as most suitable for hightemperature neutron detectors. Also, five high-temperature cements were investigated for possible use as binders in pellet fabrication, and two were found to be acceptable. A limited amount of information is given on the feasibility of replacing cadmium thermal-neutron shields with cadmium oxide shields in high-temperature environments. Facility calibration procedures and results are presented for the modified Ground Test Reactor irradiation chambers, pneumatic tubes, and standard-pile facilities. Also discussed is the interfacility comparison of sulfur-pellet calibrations conducted jointly with three other nuclear facilities. Preliminary results are presented of an experiment performed to reevaluate the counting efficiencies of the Nuclear Aerospace Research Facility end-window counters for commonly used foils. (Author)

Descriptors :   (*NUCLEAR RADIATION, RADIATION MEASURING INSTRUMENTS), (*RADIATION MEASURING INSTRUMENTS, NUCLEAR RADIATION), (*THERMAL NEUTRONS, SHIELDING), TEST REACTORS, CEMENTS, SULFUR, CADMIUM, NUCLEAR RADIATION SPECTROMETERS, NEUTRON DETECTORS, SULFUR, CADMIUM COMPOUNDS, OXIDES, FOILS(MATERIALS), COINCIDENCE COUNTING, PELLETS

Distribution Statement : APPROVED FOR PUBLIC RELEASE