Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1978-01-23
1981-02-17
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 250269, 250390, 250392, G01V 500, B01D 5944
Patent
active
042517249
ABSTRACT:
A nuclear method and apparatus determines the temperature of a medium by injecting fast neutrons into the medium and detecting returning slow neutrons in three first energy ranges by producing three respective detection signals. The detection signals are combined to produce three derived indicia each systematically related to the population of slow neutrons returning from the medium in a respective one of three second energy ranges, specifically exclusively epithermal neutrons, exclusively substantially all thermal neutrons and exclusively a portion of the thermal neutron spectrum. The derived indicia are compared with calibration indicia similarly systematically related to the population of slow neutrons in the same three second energy ranges returning from similarly irradiated calibration media for which the relationships temperature, neutron absorption cross section and neutron moderating power to such calibration indicia are known. The comparison indicates the temperature at which the calibration indicia correspond to the derived indicia and consequently the temperature of the medium. The neutron absorption cross section and moderating power of the medium can be identified at the same time.
REFERENCES:
patent: 3051838 (1962-08-01), Culp
patent: 3435217 (1969-03-01), Givens
patent: 3691378 (1972-09-01), Hopkinson et al.
patent: 4004147 (1977-01-01), Allen
E. Richard Cohen, "A Survey of Neutron Thermalization Theory", International Conference on Peaceful Uses of Atomic Energy, United Nations Publication, N.Y., 1956, vol. 5, pp. 405-416.
John Joseph
Steinman Donald K.
Vagelatos Nicholas
Young Jack C.
Fields Carolyn E.
IRT Corporation
Smith Alfred E.
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