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Method for measuring particle recovery rate

A measurement method and technology of recovery rate, applied in the field of nuclear technology monitoring, can solve problems such as large statistical deviations, achieve high abundance, avoid statistical deviations of numbers, and obtain high-efficiency effects

Active Publication Date: 2012-11-07
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the measurement result of this method is indeed the ratio of the number of particles, due to the multi-step random sampling, the statistical deviation is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The steps of this method are as follows:

[0017] (1) Select the attached 235 The wiping cotton cloth of high-concentration, monodisperse, and same particle size (1 μm) uranium oxide particles with a U abundance of 33% was placed in the α-spectroscopy sample chamber for 24 hours, and the count before recovery was recorded;

[0018] (2) Ultrasonic oscillation is performed on the particles on the carrier to recover the particles. The specific operation steps are: cut the cotton cloth in step (1) into small pieces, put it into the sample tube and add isoamyl acetate as the dispersion solvent, perform ultrasonic oscillation for 20 minutes, then drop the suspension onto the tray and heat it After curing, it is ready to measure.

[0019] (3) Put the tray with recycled particles into the α energy spectrum, keep the same measurement conditions as in step (1), record the count after recovery, the ratio of the two counts after recovery to the two counts before recovery is the p...

Embodiment 2

[0021] The method, steps, measuring instruments, wiping carrier, and particles used in Example 1 are the same, but the difference is that the dispersion solvent added when the particles are recovered by ultrasonic oscillation is ethanol, and the counting measurement after the particles are recovered and before recovery, the measurement time is At 12 hours, a particle recovery of 45% was obtained.

Embodiment 3

[0023] The method, steps, measuring instruments, wiping carrier, and particles used in Example 1 are the same, but the difference is that the dispersion solvent added when the particles are recovered by ultrasonic oscillation is heptane, and the counting and measurement of the particles after recovery and before recovery, the measurement time For 12 hours, a particle recovery of 47% was obtained.

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PUM

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Abstract

The invention belongs to the technical field of nuclear technology monitoring and discloses a method for measuring the particle recovery rate. The method comprises the step that the radioactive count ratio of particles after being subjected to recovery to particles before being subjected to recovery on a carrier is measured by an energy disperse spectroscopy and serves as the recovery rate, wherein the key point is that used particles are radioactive particles with the same composition and particle size. The method has the advantages of being capable of measuring the particle recovery rate simply, efficiently and accurately.

Description

Technical field [0001] The invention is a method of measurement in the field of nuclear technology monitoring technology, which involves the measurement method of particle recycling rate. Background technique [0002] Graval analysis is one of the important technical methods for nuclear guarantee supervision. It provides an important method for determining the unsusted nuclear materials or nuclear activities.Obtain important nuclear activity information near the sampling point.The environmental sample obtained by the sampling of the sample cannot be directly analyzed. First of all, the particle sample must be separated from the wiping carrier (such as cotton cloth, filter paper, etc.). The particle recycling methods widely used at this stage are ultrasonic oscillation and negative pressure impact. [0003] The core evaluation indicator of the particle recycling method is the particle recycling rate, that is, the ratio of the number of particles recovered from the sample from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22
Inventor 王凡陈彦赵永刚张燕王同兴常志远崔海平李井怀
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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