焼却灰及びセメント固化体の放射化学分析のためのマイクロ波加熱装置を用いる試料溶解法

概要

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For the radiochemical analysis of low-level radioactive wastes, a relatively large quantity of sample solutions must be prepared. In order to dissolve incinerated ash (fly ash and bottom ash) of radioactive combustible wastes and cement-solidified products of radioactive liquid wastes, a dissolution method using microwave heating devices was developed. In the present method, most metal elements in samples were extracted with HCl and HNO3 to the sample solution and a precipitate with silica as the main ingredient was decomposed with HF and HNO3. As a result, the fluoride residue was sufficiently reduced and more than 99% of the radionuclides were recovered to the sample solution. The ash and cement-solidified product samples were successfully dissolved in a shorter time compared with that of a conventional method by external heating, because HClO4 with a high boiling point and having much time for heating to dryness was not used.