Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within... – Storage container systems for new and/or irradiated core...
Patent
1990-12-18
1993-02-09
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
Storage container systems for new and/or irradiated core...
376245, 376247, 376257, 376299, 376450, 2503361, 374 1, 374179, G21F 506
Patent
active
051851229
ABSTRACT:
Gamma radiation leaving the surface of a radioactive materials storage vessel is measured and monitored using a plurality of gamma ray absorbing calorimeters. The gamma ray energy absorbed is converted into heat and such heat is measured or indicated for the purpose of monitoring expected radioactive decay processes of the stored radioactive materials. Material leakage or removal from storage is detected and defined by deviations from the normal expected decay in gamma radiation. Such deviation or lack of deviation, as the case may be, provide the desired accountability of the radioactive materials. Since there can be several bands of gamma ray radiation, both flux and its energy level may be determined by using different gamma absorbing materials in the calorimeters selected for the known possible energy levels of the decaying radioactive material. From `n` simultaneous heat balance equations one for each calorimeter having a different absorbing material, it is possible to measure the energy level of the gamma radiation flux at each calorimeter.
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Lundin John A.
Poppendiek Heinz F.
Carroll Chrisman D.
Fernandez Antonio M.
Geoscience Ltd.
Walsh Donald P.
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