A method for analyzing technetium-99 content in soil

Abstract

The invention relates to a method for analyzing the content of technetium-99 in soil. The method includes the following steps that sample preprocessing operations such as drying, smashing and screening are performed, operations, for transferring the technetium-99 into a solution, such as weighing, ashing and soaking are performed, the technetium-99 is separated, enriched and purified, and radioactive measurement is performed on the technetium-99. According to the method, the technetium-99 is separated, enriched and purified with a special effect solid-phase extraction disk method, separation, enriching and purification can be completed within half an hour, and the special effect solid-phase extraction disk method is far easier, more convenient and faster than a traditional chromatographic method or a precipitation method; a solid-phase extraction disk enriched with the technetium-99 can be directly used for radioactive measurement, the situation that after separation is performed with other methods, a measurement source is prepared by drying by distillation and redissolving is avoided, in other words, the step for preparing the radioactive measurement source is omitted, operation is easier and more convenient, and workloads of analysts are reduced.

Description

technical field [0001] The invention relates to the field of radionuclide analysis, in particular to an analysis method for technetium-99 content in soil. technical background [0002] Technetium-99 has become one of the most concerned nuclides in environmental radiochemistry because of its long half-life, fast migration speed, and easy entry into plants from soil. Scholars at home and abroad have done a lot of work on the analysis of technetium-99 in soil samples. So far, there are three main methods for the analysis of technetium-99 in environmental samples: mass spectrometry, beta counting and neutron activation. Among them, the β-counting method has the advantages of simple operation and no dependence on large-scale instruments, and the detection limit can also meet the needs of general environmental sample analysis. [0003] The difficulty of analyzing technetium-99 by β counting method lies in how to extract technetium-99 from the complex sample matrix and remove oth...

AI Technical Summary

Problems solved by technology

Among them, the dry distillation method is complex, and the chemical yield of technetium-99 fluctuates greatly; the precipitation method is too cumbersome to operate; although the TEVA resin chromatography is relatively simple and the chemical yield is relatively stable, the volume of the solution is large and the chromatographic The column's solution flow rate in the order of milliliters per minute will result in a long analysis time

After separation and purification of technetium by dry distillation, precipitation or TEVA resin chromatography, the obtained technetium-99-containing solution needs to be evaporated to dryness and then dissolved to prepare radioactive measurement sources, and the steps are relatively cumbersome.

Images