廃棄物固化体の分析手法に関する調査

Investigation on analytical technique of solidified product of wastes

落合 健一*; 藤田 秀人; 日野田 正博*; 石井 照明*; 伊藤 剛士*; 戸祭 智*

not registered; not registered; not registered; not registered; not registered; not registered

アスファルト固化体並びにプラスチック固化体の評価を行うために,放射化学分析手法について調査・検討した。また,それらの技術の適用化について開発試験計画を策定した。以下に実施内容の要約を示す。1)放射性廃棄物固化体の放射化学手法の調査-)対象試料の前処理方法試料の無機課処理,溶液化処理のために灰化あるいは溶媒溶解法などの手法が有効であるが,その操作条件として処理温度を管理し,対象核種の飛散を防止することが肝要である。-)対象核種の分離・単離方法 化学挙動が類似した核種ごとにあらかじめ分類し,その後核種ごとに単離・計測する手法が有効であることが示された。それらの方法として,イオン交換法や抽出法を採取することが望ましい。2)開発試験計画 放射化学分析手法の中で,前処理並びに粗分離・単離法について核種の回収率,分配及び操作性を検討する上で,模擬コールド試験及び模擬ホット試験を実施することが必要であることを示した。

In Bituminization Demonstration Facility, low-level radioactive liquid waste has been solidfying with asphalt to institution, whereas in Solvent Waste Treatment Demonstration Facility, solvent waste has been solidfying with epoxy resin or PVC (henceforth designated as plastic solidfied product). The radiochemically analytical techniques were investigated and examined in order to carry out the evaluation of those products, and decide to the plan for development of the experiment on the application of these techniques were performed. A summary of contents of practice is indicated as follows: (1)Investigation of radiochemically analytical techniqueson solidified product of radioactive wastes. (a)Methods of preliminary treatment of samples. THe methods of ashing or liquedying in solvents are effective to Inorganically and solvolysis for the samples, however as operating conditions, it is important that the operation temperature control, and prevented the scattering of ofject nuclides. (b)Method of separating and isolating of ofject nuclides. The ofject nuclides were previously classified into the groupes being similar in chemical behavior, after it was indicated that the methods for isolating and measuring each group is effective. For these techniques, it is desirable to adopt the ion exchange and extracting methods. (2)Plan for development of experiment. It was indicated that simulated Cold and Hot tests were necessary to operate in order to investigate the functions of the recovery, distribution and handling with preliminaly treatment, methods of separating and isolating in the radio chemically analytical technique.