Speaker
Description
Iodine, as an essential biophilic element, is widely present in living organisms and crucial for human life activities. Among iodine isotopes, only iodine-127 is a stable nucleus, while iodine-129 has the longest half-life (1570 million years). Therefore, it is particularly important to isolate iodine from soil samples and utilize AMS to measure the ratio of iodine-129 to iodine-127 for analyzing the level of environmental nuclear contamination. In this study, a method involving the addition of a carrier to precipitate iodine as silver iodide forming milligram-level iodine targets was developed. Using a tube furnace to generate high temperatures, iodine was volatilized from soil samples, and the released iodine vapor was collected with an alkaline trapping solution. 1 mg of carrier iodine was added to the trapping solution, and all iodides were reduced to iodide ions through oxidation-reduction reactions. A 1 ml solution was taken for stable iodine measurement using ICP-MS. Adding silver nitrate to the solution produced a precipitate. Impurities in the precipitate were dissolved and washed away with ammonia solution to obtain silver iodide precipitate. The precipitate was dried, mixed with niobium powder, pressed into a target, and measured with AMS to obtain the ratio of the two isotopes. This method can accurately determine the ratio of iodine-129 to iodine-127 content, with broad potential applications in environmental monitoring and geological dating.
| Student Submission | Yes |
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