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Method for measuring particle recovery

A measurement method and recovery rate technology, applied in the field of nuclear technology monitoring, can solve the problem of large statistical deviation, and achieve the effect of avoiding the statistical deviation of the number

Active Publication Date: 2016-01-20
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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Abstract

The invention belongs to the technical field of nuclear technology monitoring and discloses a method for measuring the recovery rate of particles. This method uses energy spectrometer to measure the radioactive count ratio of particles on the carrier after recovery and before recovery as the recovery rate. The key point is that the particles used are radioactive particles with the same composition and particle size. The method has the characteristics of simple, efficient and accurate measurement of particle recovery.

Description

technical field [0001] The invention belongs to the technical field of nuclear technology monitoring, and in particular relates to a method for measuring the recovery rate of particles. Background technique [0002] Particle analysis is one of the important technical methods of nuclear safeguards, and provides an important method for determining undeclared nuclear materials or nuclear activities. It mainly collects swab samples inside or around nuclear facilities for particle isotope analysis. Obtain important nuclear activity information near the sampling point. The environmental samples obtained by swabbing cannot be analyzed directly. First, the particulate samples must be separated from the wiping carrier (such as cotton cloth, filter paper, etc.). The widely used particle recovery methods at this stage are mainly ultrasonic oscillation and negative pressure impact. [0003] The core evaluation index of the particle recovery method is the particle recovery rate, that is...

Claims

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Application Information

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Patent Type & Authority Patents(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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