Standard method for measuring fast-neutron flux by radioactivation of nickel
Book
·
OSTI ID:4406558
This method describes a means of measuring fast-neutron flux with the threshold reaction /sup 58/Ni(n,p)/sup 58/Co. This reaction proceeds to form two /sup 58/Co isomers with half-lives of 71.3 d and 9,2 h. Decay of the 9,2-h isomer from its metastable state to the ground state produces a final 71.3 d /sup 58/Co. Loss of /sup 58/Co and /sup 58m/Co by thermal-neutron burnout will occur in environments having thermal fluxes of 3 x 10/sup 12/ neutrons/cm/sup 2//e and above. The effective threshold energy of nickel is near that of sulfur for a fission spectrum. With suitable techniques, fission-neutron flux in the approximate range from 10/sup 3/ neutron/cm/sup 2/s to 10/sup 15/ neutrons/cm/sup 2//s can be measured, The 71.3-d half-life of /sup 58/Co offers the advantages of measuring fluence up to irradiation times of 100 is and to a minimum value in the range of 10/sup 22/ neutrons/cm/sup 2/s. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-010203
- OSTI ID:
- 4406558
- Report Number(s):
- ASTM-E--264-70
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Standard method for measuring fast-neutron flux by radioactivation of nickel
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Mon Jun 18 00:00:00 EDT 1962
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OSTI ID:4787155