Detailed study of the γ-radiolysis of nitrilotriacetic acid in a simulated, mixed nuclear waste


Gamma radiolysis of a simulant of an actual mixed waste, composed of nitrilotriacetic acid (NTA) and an inorganic matrix, at γ-doses ranging from 0-7.5.106±10% R in a 60Co-source, resulted in total NTA degradation, but 10.8% of the simulant's original organic content remained. Radiolysis yielded 4 chelator fragments and 2 carboxylic acids, all formed at different rates. The chelator fragment N-(Methylamine)iminodiacetic acid (MAIDA) dominated at low γ-doses, while N-[N'-amino(2-iminoethyl)]iminodiacetic acid (AIEIDA) dominated at high γ-doses. Chemical degradation control studies revealed that the harsh chemistry of the inorganic matrix caused only 20.7% NTA degradation and formation of only 2 chelator fragments, while the heat generated by the 60Co-source (95°C) had little additional impact.


Chemistry and Biochemistry

Document Type

Conference Proceeding


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Journal Title

Journal of Radioanalytical and Nuclear Chemistry