A method for analyzing technetium-99 content in soil

An analysis method and content technology, applied in the field of analysis of technetium-99 content in soil, can solve the problems of cumbersome steps, long analysis time, large solution volume, etc., and achieve the effect of reducing workload, simple analysis, and time saving

Active Publication Date: 2017-09-12
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • A method for analyzing technetium-99 content in soil
  • A method for analyzing technetium-99 content in soil

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Embodiment 1

[0022] see figure 1 As shown, it is a flow chart of the analysis method of technetium-99 content in soil of the present invention. This embodiment provides an analysis method of technetium-99 content in soil containing less organic matter. The specific steps are as follows:

[0023] S1. Sample pretreatment: pass the soil sample through a 20-mesh sieve, and dry it at 70°C to constant weight.

[0024] S2. Weighing the soil sample: accurately weigh a 10 g soil sample into a small beaker, add 500.00 Bq of technetium-99m tracer to the soil sample, and dry it under an infrared lamp.

[0025] S3, leaching: transfer the soil sample to a 200mL single-necked flask, add 50mL of 1mol / L nitric acid, 2mL of 30% hydrogen peroxide in the flask, heat the electric heating mantle to 80°C under reflux and keep it for 4 hours to obtain Leach solution: after cooling, transfer the leach solution and precipitate to a centrifuge tube, centrifuge at 3500rpm for 5 minutes, transfer the supernatant to ...

Embodiment 2

[0031] see figure 2 As shown, it is a flow chart of the analysis method of technetium-99 content in soil of the present invention. This embodiment provides an analysis method of technetium-99 content in soil containing more organic matter. The specific steps are as follows:

[0032] S1. Sample pretreatment: pass a soil sample through a 20-mesh sieve, and dry it at 70°C to constant weight.

[0033] S2. Weighing the soil sample: Accurately weigh two soil samples with a mass of 10 g in a 100 mL magnetic crucible, numbered sample 1 and sample 1′, and add 10.00 Bq of technetium-99 to sample 1′. The tracer is used as a parallel sample to obtain the chemical yield of technetium-99 in the separation process. Both samples are dried under infrared lamps. Among them, the technetium-99 contained in the tracer technetium-99m should be as close as possible to the sample The amount of technetium-99 contained in it is similar.

[0034] S3. Ashing: both the soil samples 1 and 1' were put i...

Embodiment 3

[0042]This example provides an analysis method for the content of technetium-99 in soil with less organic matter, using solid-phase extraction to enrich technetium-99, in addition to directly measuring the radioactivity of solid-phase extraction, it is also possible to The phase extraction sheet is desorbed, and the specific steps are as follows:

[0043] S1. Sample pretreatment: pass the soil sample through a 20-mesh sieve, and dry it at 70°C to constant weight.

[0044] S2. Weighing the soil sample: accurately weigh a 10 g soil sample into a small beaker, add 200.0 Bq of technetium-99m tracer to the soil sample, and dry it under an infrared lamp.

[0045] S3, leaching: transfer the soil sample to a 200mL single-necked flask, add 50mL of 1mol / L nitric acid, 2mL of 30% hydrogen peroxide in the flask, heat the electric heating mantle to 90°C under reflux and keep it for 4 hours to obtain Leach solution: after cooling, transfer the leach solution and the precipitate to a centri...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
Inventor 杨素亮丁有钱梁小虎宋志君孙宏清张生栋
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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