Induced nuclear reactions: processes – systems – and elements – Nuclear transmutation – By neutron bombardment
Patent
1980-08-06
1982-11-30
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Nuclear transmutation
By neutron bombardment
376163, G21G 106
Patent
active
043615341
ABSTRACT:
Neutron activation is used to analyse the silicon and aluminium content of samples of material, such as bauxite ore and coal. The analysis can be performed on bulk samples, on material on a moving conveyor belt, or on the walls of a borehole. The method involves high energy neutron irradiation of the sample, measurement of the thermal neutron flux in the sample, and monitoring the gamma radiation from the sample at energies of (a) 1.78 MeV and (b) 0.844 MeV and/or 1.015 MeV. Such gamma radiation is produced on decay of (a) .sup.28 Al and (b) .sup.27 Mg isotopes, produced by the reactions .sup.28 Si(n,p).sup.28 Al and .sup.27 Al(n,p).sup.27 Mg. A single gamma ray detector is used. The analysis preferably utilizes equations which include terms to compensate for (a) the production of radiation at 1.78 MeV as a result of the production of the isotope .sup.28 Al from .sup.27 Al by the thermal neutron reaction .sup.27 Al(n,.gamma.).sup.28 Al, and (b) the Compton scattering of 1.78 MeV gamma radiation and background.
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Borsaru Mihai
Eisler Peter L.
Behrend Harvey E.
Commonwealth Scientific and Industrial Research Organization
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