放射性廃液のアスファルト固化体中IのICP-MSを用いる簡易分析法

概要

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A simple determination method was developed to measure 129I in low-level radioactive liquid waste solidified with bitumen. A simulated bituminized product sample was cut into 0.02 g pieces ; subsequently, these pieces and sodium carbonate were heated in an electric furnace. This procedure could well decompose the bituminized sample without volatilizing 129I. Sixty to seventy-five percent of 129I was recovered by a solid-phase extraction disk from a solution containing the decomposed sample. A dynamic reaction cell inductively coupled plasma mass spectrometer was applied to measure 129I ; as a result, detection limit of 129I was reduced by a factor of about 6 compared with the conventional ICP-MS measurement. The determined radioactivity concentration for the simulated bituminized sample containing 129I was in good agreement with the expected value within a 6% error.