METHOD FOR SIMULTANEOUSLY SEPARATING RADIOACTIVE CARBON AND RADIOACTIVE IODINE

摘要

PROBLEM TO BE SOLVED: To provide a method by which radioactive carbon and radioactive iodine can be separated at the same time from a radioactive waste liquid including various radioactive nuclides with saved labor in a speeded work. SOLUTION: A radioactive waste liquid including radioactive carbon and radioactive iodine along with the other radioactive nuclides is collected in a reaction tube 1, to which nitric acid is added. After the radioactive waste liquid is acidified, the liquid is heated. As a result, the radioactive carbon and radioactive iodine are simultaneously vaporized and separated from the waste liquid as CO2 and I2 . The vaporized substance is passed through an absorption tube 2 of a first stage containing an aqueous solution of sodium sulfite, so that the I2 is absorbed into the sodium sulfite aqueous solution and the substance is collected as NaI. The vaporized substance passing through the absorption tube of the first stage is subsequently passed through an absorption tube 3 of a second stage containing an aqueous solution of sodium hydroxide, so that the CO2 is absorbed to the sodium hydroxide aqueous solution and the substance is collected as Na2 Co3 .