Method of separating neptunium and plutonium

Details Method of separating neptunium and plutonium Method of separating neptunium and plutonium

1994-09-12

1996-03-19

Mai, Ngoclan

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

2041582, 2041574, 210682, 976DIG279, C01G 5600

Patent

active

055001920

ABSTRACT:
In a method of separating neptunium and plutonium, a nitric acid solution containing a mixture of neptunium and plutonium is oxidized by irradiation of ultraviolet light in the presence of a reducing agent. As a result, different valences of neptunium are adjusted all into the valence 5, which can remain in water, and in the meantime, valences of plutonium are adjusted into the valence 4 or 6, which can be extracted in the organic phase. It is therefore possible to separate neptunium and plutonium from each other without difficulty.

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Patei, P. N. et al, Change in the valence state of plutonium in solutions of nitric, hydrochloric, sulfuric, and perchloric acids during ultraviolet irradiation, 1969, Radiokhimiya, 11(3), pp. 300-307.
Galkin, B. Ya, et al, Photooxidation of neptunium in nitric acid solutions, 1985, Radiokhimiya, 27(4), pp. 494-497.
71-Nuclear Technology, vol. 120, 1994 CA:146806k.
Vladimirova, M. V., et al, Radiation-Chemical Behavior of Actinoids in Extraition Systems, I. Pu.sup.(IV), Np.sup.(IV), Th.sup.(IV) in a 30% Tri-n-butyl phosphate-n-dodecane solution during .delta.-radiolysis, 1982, Radiokhimiya, 24(1), pp. 38-42.
1993 Fall Meeting of the Atomic Energy Society of Japan, Oct. 9-11, 1993. No translation.
PNC Technical Review, No. 88, Dec. 1993, "Basic Study of Photochemical Valency Adjustment of Plutonium (Pu) and Neptunium (Np) in Nitric Acid Solution," pp. 40-53. (No translation).

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