Process for decontaminating radioactive metal surfaces

Details Process for decontaminating radioactive metal surfaces Process for decontaminating radioactive metal surfaces

1994-01-28

1995-01-31

Walsh, Donald P.

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

Chemical conversion to a stable solid for disposal

588 4, 134 3, 134 4, 134 29, G21F 900

Patent

active

053860780

ABSTRACT:
A method for decontaminating a radioactively contaminated metallic object. A radioactively contaminated metallic object is placed into a first bath and thus contacted with a non-radioactive, aqueous solution containing formic acid until the formic acid is completely stoichiometrically depleted thereby forming an aqueous, stoichiometrically depleted solution. The metallic object is then placed into a second bath of the same chemical composition. The non-radioactive, aqueous solution of the second bath is also preferably completely stoichiometrically depleted. The concentration of the aqueous solution containing formic acid is preferably about 0.3 Mol/l. These steps are repeated until the residual radioactivity level of the metallic object is beneath a permissible threshold level, such as 0.37 Bq/cm.sup.2. The radioactive metallic oxides and metallic hydroxides are sedimented out, and the sludge is solidified with cement and subsequently decontaminated.

REFERENCES:
patent: 4508641 (1985-04-01), Hanulik
patent: 4587043 (1986-05-01), Murray et al.
patent: 5008044 (1991-04-01), Hanulik
patent: 5024805 (1991-06-01), Murray

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