Compositions – Radioactive compositions
Patent
1985-03-11
1987-05-05
Lechert, Jr., Stephen J.
Compositions
Radioactive compositions
134 3, 134 13, 134104, 204 15, 204149, 204152, 204194, 204232, 204234, 204235, 204237, 204238, 204240, 204267, 376313, 376314, G21F 900, G21F 928
Patent
active
046630856
ABSTRACT:
The invention resides in an apparatus for the decontamination of radioactivated metallic waste by the electrolytic oxidation-reduction with an aqueous nitric acid solution containing trivalent cerium ions, i.e. the step of converting the trivalent cerium ions into tetravalent cerium ions through electrolytic oxidation and the step of dissolving the surface layer of the radioactivated metallic waste by oxidizing it with the electrolytic solution now vested with the oxidative power of the freshly produced tetravalent cerium ions and, at the same time, effecting regeneration of the tetravalent cerium ions. The main objects of this invention are to provide a high decontamination efficiency and suppression of the amount of secondary waste to be generated to the minimum by the apparatus which is capable of thoroughly dissolving the surface layer of the object under treatment without reference to size and shapes, the very factors that prevent the conventional methods of decontamination from fulfilling their functions indiscriminately, thereby lowering the level of radioactivity to a point where the object will be handled as safely as ordinary industrial waste.
REFERENCES:
patent: 4162229 (1979-07-01), Loewenchuss
patent: 4217192 (1980-08-01), Lerch et al.
Partridge, et al. 1979, Chemical Decontamination of Metals, Transactions of the American Nuclear Society 33, pp. 430-431.
Partridge, et al. 1979, Decontamination of TRU Contaminated Metals HEDL-TC-1503, 14 pages.
Enda Masami
Fujita Reiko
Hasegawa Yutaka
Morisue Tetsuo
Kabushiki Kaisha Toshiba
Lechert Jr. Stephen J.
Locker Howard J.
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