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Filter material sample gamma measurement source preparation method and device based on particulate matter extraction

An extraction device and particulate matter technology, which is applied in the field of gamma measurement of filter material samples based on particulate matter extraction, can solve the problems of low separation efficiency, lack of implementation details, and large loss of particulate matter, and achieve the effect of high separation efficiency.

Active Publication Date: 2020-06-26
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a filter material sample gamma measurement source preparation method based on particle extraction to solve the technical problem of lack of specific implementation details when the washing method is used as the filter material sample source preparation method; at the same time, the invention also provides a Filter material sample gamma measurement source preparation device based on particulate matter extraction to solve the technical problems of large particle loss, low separation efficiency and inability to use organic solvents for washing when the existing washing machine is used as a separation device for washing and separation source preparation

Method used

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  • Filter material sample gamma measurement source preparation method and device based on particulate matter extraction
  • Filter material sample gamma measurement source preparation method and device based on particulate matter extraction
  • Filter material sample gamma measurement source preparation method and device based on particulate matter extraction

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Embodiment 1

[0129] Embodiment 1: the filter material sheet 9 after sampling in step 1 is 25 grams, adds 3 liters of water, adds surfactant 1.5 milliliters; The stirring speed of step 2 is 800 revolutions per minute, and the stirring time is 3 minutes; The rotating speed of step 3 The speed is 1600 revolutions per minute, and the dehydration time is 1 minute.

Embodiment 2

[0130] Embodiment 2: the filter material sheet 9 after sampling in step 1 is 40 grams, adds 3 liters of water, adds 3 milliliters of surfactants; The stirring speed of step 2 is 400 revolutions per minute, and the stirring time is 5 minutes; The rotating speed of step 3 1400 revolutions per minute, dehydration time is 1 minute.

[0131] After measurement, the measurement results of the above-mentioned embodiment 1 and embodiment 2 are consistent with the measurement results obtained by other methods.

[0132] The method and device for manufacturing gamma measurement sources of filter material samples based on particulate matter extraction of the present invention can be widely used in the preparation of gamma measurement sources for aerosol filter material samples in different environments.

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Abstract

The invention relates to a gamma radioactivity measurement source preparation method and device, and particularly relates to a method and device for preparing source of filter material sample gamma measurement based on particle extraction. The method and device solve the problems of lacking of implementation details when the washing method is used as the source method of the filter material sample, and solve the problems of large loss of particles, low separation efficiency and incapability of washing with an organic solvent when the existing washing machine is used for washing and separating.The method comprises the following steps: step 1, putting a sampled filter sheet into a separation device, and adding water and a surfactant; the outer layer of the separating device is of a barrel-shaped structure, and the inner layer is provided with a plurality of holes and can rotate; step 2, washing, and flowing out the turbid liquid; step 3, dehydrating, and flowing out the residual emulsion; step 4, treating the effluent emulsion of the step 2 and step 3; step 5, sending the treated clear liquid back to a separation device, repeating the steps 2 to 4 at least twice, collecting the clear liquid, and collecting particles on a filter membrane; step 6, evaporating the clear liquid under low pressure, and putting the obtained solid residue into a filter membrane in step 5; step 7, folding the filter membrane.

Description

technical field [0001] The invention relates to a gamma radiation measurement source preparation method and device, in particular to a filter material sample gamma measurement source preparation method and device based on particle extraction. Background technique [0002] Sampling with ultra-high flow aerosol sampler is a common method in the monitoring of radioactive aerosols in the atmosphere. When sampling, in order to reduce the filtration flow rate, improve the sampling efficiency, reduce the sampling pressure resistance and reduce the pumping power, the generally used filter material area (about 0.2m 2 ) is relatively large; since the larger geometric size of the filter material will reduce the γ detection efficiency of the nuclide, it is generally necessary to press the filter material into pieces before measuring the γ radioactivity after sampling; the commonly used classic method is to use hydraulic machinery to The filter material is pressed into a thick disc with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167G01N1/28
CPCG01N1/28G01T1/167
Inventor 李冬梅刘龙波唐寒冰岳晨午周世友张小林
Owner NORTHWEST INST OF NUCLEAR TECH
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