Radiation sources and process

Chemistry: electrical and wave energy – Processes and products

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204 15, 204 29, 204 40, 204 43T, 204 43N, 204 43G, 250493, 250499, 2523011R, C25D 354, C09K 300

Patent

active

041971701

ABSTRACT:
The invention relates to radiation sources comprising a substrate having an electrically-conductive non-radioactive metal surface, a layer of a metal radioactive isotope of the Scandium group, which in addition to scandium, yttrium, lanthanum and actinium, includes all the lanthanide and actinide series of elements, with the actinide series usually being preferred because of the nature of the radioactive isotopes therein, particularly americium-241, curium-244, plutonium-238, californium-252 and promethium-147, and a non-radioactive bonding metal codeposited on the surface by electroplating the isotope and bonding metal from an electrolytic solution, the isotope being present in the layer in minor amount as compared to the bonding metal, and with or without a non-radioactive protective metal coating covering the isotype and bonding metal on the surface, the coating being sufficiently thin to permit radiation to pass through the coating. The invention also relates to a process for providing radiation sources comprising codepositing a layer of the metal radioactive isotope with a non-radioactive bonding metal from an electrolytic solution in which the isotope is present in minor molar amount as compared to the bonding metal such that the codeposited layer contains a minor molar amount of the isotope compared to the bonding metal by electroplating on an electrically-conductive non-radioactive metal surface of a cathode substrate, and with or without depositing a non-radioactive protective metal coating over the isotope and bonding metal on The surface, the coating being sufficiently thin to permit radiation to pass through the coating.

REFERENCES:
patent: 3859179 (1975-01-01), Staples
Strain et al., ORNL-3335, The Preparation and Properties and uses of Am.sup.241, Alpha--, Gamma-, and neutron Sources, 1962, UC-4, pp. 12-15.
Verdingh et al., AERE-R-5097, UC-4-2, Proceedings of the Seminar on the Preparation and Standardization of Isotopic Targets and Foils, held at A.E.R.E., Harwell, Oct. 20-21, 1965, Smith M. L. ed., (Atomic Energy Research Establishment, Harwell, Eng.) Dec. 1965, pp. 58-62.
Valentin et al., Paper 15, AERE-R-5097, Proceedings of the Seminar on the Preparation and Standardization of Isotopic Targets and Foils, held at A. E. R. E., Harwell, Oct. 20-21, 1965, Smith, M. L. ed., Atomic Energy Research Estab., Harwell, Eng., Dec. 1965, pp. 86-87.
Bellemare et al.,Nuclear Instruments and Methods, 96, 1971, pp. 209-211.
Prakash et al., International Journal of Applied Radiation and Isotopes, 1971, vol. 22, pp. 128-129.
Foreman et al., Analytical Chimica Acta, 81, (1976), pp. 413-417.

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