Radioactive surface contamination screening analysis method

An analysis method and surface contamination technology, applied in the direction of analysis materials, measuring devices, instruments, etc., can solve the problems of content analysis and particle identification adverse effects, it is difficult to ensure particle shedding and recovery, change chemical form, etc., to improve the quality of samples The effect of pre-processing rate, reducing operation complexity and time consumption, and efficient recycling

Active Publication Date: 2022-04-19
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When wiping samples are treated by high temperature ashing or strong acid digestion, high temperature, high acid equipment and a large number of personnel are often required to operate, which takes a long time
In addition, the high-temperature ashing process may cause sample loss, and high-temperature conditions may change the physical (particle size) and chemical morphology of the collected samples, which will adversely affect subsequent content analysis and particle identification.
The method of using ultrasonic vibration in an inert solvent to detach the collected material from the wiping material to realize particle recovery is easy to operate, but it is difficult to ensure that all the particles are shed and recovered in this process, and there is a large uncertainty

Method used

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  • Radioactive surface contamination screening analysis method

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Effect test

Embodiment 1

[0031] Whole-Sample Analysis Sample Prep Validation

[0032] Principle: quantitatively add uranium-containing particles to the water-soluble polyvinyl alcohol fiber material to simulate wiping samples, and through the sample pretreatment process, the recovery rate of uranium in the obtained hydroxide precipitates is tested.

[0033] Specific steps are as follows:

[0034] 1) Preparation of uranium particles: accurately measure 2 mL of uranium standard solution (containing 2.0 mg of uranium) in a 50 mL centrifuge tube, add sodium hydroxide to precipitate the uranium, centrifuge, and dry the precipitation;

[0035] 2) Preparation of wiping and adding a standard sample: take a piece of 5cm×5cm water-soluble polyvinyl alcohol fiber cloth, wipe the uranium precipitate and the inner wall of the centrifuge tube, and place it in the centrifuge tube;

[0036] 3) sample pretreatment: add the sodium hydroxide solution of 20ml 0.1mol / L in this 50ml centrifuge tube, shake to dissolve the ...

Embodiment 2

[0040] Thermal Particle Analysis Sample Preparation Validation

[0041]Principle: Add uranium particles to water-soluble polyvinyl alcohol fiber material to simulate wiping samples, and after sample pretreatment, test the recovery rate of uranium particles obtained on the filter membrane.

[0042] 1) Preparation of uranium particles: Accurately measure 10 mL of uranium standard solution (containing 10 mg of uranium), add sodium hydroxide to precipitate the uranium, centrifuge, and dry the precipitate; place the dried precipitate in 10 mL of anhydrous ethanol and oscillate with ultrasonic waves Dissipate it; pipette 0.2 mL of the suspension on 2 watch dishes in turn (numbered B1 and B2 in sequence), wait for the ethanol to evaporate to dryness to form a uranium particle layer;

[0043] 2) Statistics of the number of particles before recovery: take the B1 sample, use conductive tape to stick the particle layer area on the watch glass, and transfer all the particles to the conduc...

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Abstract

The invention belongs to the technical field of radioactive substance analysis, and relates to a screening analysis method for radioactive surface contamination. The analysis method comprises the following steps: (1) carrying out radioactive surface contamination wiping sampling by using a water-soluble polyvinyl alcohol fiber material; (2) completely dissolving the wiping sample with a sodium hydroxide solution, adding a newly prepared hydroxide precipitate suspension, uniformly mixing, centrifuging, further performing radiochemical separation and purification on the precipitate, preparing a source, and performing total sample analysis and measurement; and (3) dissolving the wiping sample with a dimethyl sulfoxide solution, carrying out ultrasonic oscillation, filtering with a filter membrane, retaining the filter membrane, and preparing a source for thermal particle analysis and measurement. According to the screening analysis method for the radioactive surface contamination, the particles attached to the radioactive surface contamination wiping sample can be rapidly and efficiently separated and recycled and measured.

Description

technical field [0001] The invention belongs to the technical field of radioactive material analysis, and relates to a screening and analysis method for radioactive surface contamination. Background technique [0002] The UN Treaty on the Non-Proliferation of Nuclear Weapons stipulates that signatories are required to declare their nuclear material inventories and related nuclear activities, and allow the International Atomic Energy Agency (IAEA) to independently verify these declarations. [0003] Environmental Radioactive Surface Contamination Wipe Sampling and Analysis (ESSA) is one of the most common IAEA nuclear safeguards verification techniques. Ratio data captures fingerprint information on the operation of nuclear facilities. According to the analysis target and sample radioactivity level, ESSA adopts two different analysis strategies: thermal particle analysis and whole sample analysis. [0004] The thermal particle analysis method aims to obtain the nuclide info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/38G01N1/04G01N1/10G01N33/00
CPCG01N1/28G01N1/34G01N1/38G01N1/04G01N1/10G01N33/00
Inventor 王亚东马彦王路生马莉娜杨永刚张辉宋丽娟罗茂益戴雄新李鹏翔任晓娜
Owner CHINA INST FOR RADIATION PROTECTION
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