| 摘要 |
PURPOSE:To accurately measure a radioactive matter especially in a cooling water by a method wherein an isotope thereof is mixed into a liquid containing the substance by putting it to a sampling piping through which the liquid has been sampled and then, the concentration of the radioactive substance and the isotope thereof is determined in the liquid separately. CONSTITUTION:For example, a cooling water in a pressure vessel 31 of a nuclear reactor is sampled via a valve 47 from a sampling piping 40 through a piping to a desalting device 39 from a heat exchange 38 to measure <60>Co therein. The isotope <56>Co is fed and mixed thereinto on the upstream of the piping from a solution storage tank 41 through a flowmeter 44, a pump 42 and a valve 43, <60>Co and <56>Co are trapped through a trapper 45 and the total flow rate thereof is measured with a flowmeter 49. <60>Co and <56>Co trapped with a cation paper or the like in the trapper 45 are measured separately and the quantity of <60>Co attached is detected in proportion to <56>Co from the quantity of <56>Co attached to the inner wall of the sampling piping, which makes possible accurate measurement of <60>Co in the cooling water. The same prodecure is conducted for other radioactive matters. |
