SOLID STATE JUNCTION FAST NEUTRON SPECTROMETERS. Includes Appendicies: I. INITIAL CONCEPTS OF P-N JUNCTION FAST NEUTRON SPECTROMETERS. II. ARTIFICIAL CROSS SECTIONS FOR THRESHOLD DETECTORS. III. FAST NEUTRON DAMAGE TO SILICON JUNCTION PARTICLE DETECTORS
Possible fast neutron spectroscopy systems using P-N junctions were investigated. Combinations of fast fission threshold counters exhibited useful energy dependencies. As part of this evaluation, fission cross sections of Th/ sup 232/ and U/sup 234/ in the 12 to 18 Mev range were measured. Li/sup 6/F spectrometers exhibited excellent energy resolution. To extend their value, the Li/sup 6/(n, alpha )H/sup 3/ cross section was measured in the range 0.75 to 1.65 Mev. A carbon recoil method for large neutron fluxes also showed promise. A system using the Li/sup 6/F device in the range 0 to 8 Mev and carbon recoil at higher energies is recommended. Where less resolution is needed the fast fission system is more sensitive. (auth)
- Research Organization:
- Westinghouse Electric Corp. Materials Labs., East Pittsburgh, Penna.
- NSA Number:
- NSA-15-032305
- OSTI ID:
- 4835070
- Report Number(s):
- AFSWC-TR-61-57
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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