CN102768221B - The measuring method of particle recovery rate - Google Patents
The measuring method of particle recovery rate Download PDFInfo
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- CN102768221B CN102768221B CN201210283048.9A CN201210283048A CN102768221B CN 102768221 B CN102768221 B CN 102768221B CN 201210283048 A CN201210283048 A CN 201210283048A CN 102768221 B CN102768221 B CN 102768221B
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Abstract
The invention belongs to nuclear technology monitoring technique field, disclose the measuring method of particle recovery rate.The method be by energy spectrometer measure carrier reclaims after with reclaim before the radiocounting of particulate than as the recovery, key is, particulate used is the radioactive particulate that composition, particle diameter are all identical.The method has simply, the feature of efficient, Measurement accuracy particle recovery rate.
Description
Technical field
The invention belongs to nuclear technology monitoring technique field, be specifically related to the measuring method of particle recovery rate.
Background technology
Particulate analysis is one of important technology method of nuclear safeguards, for determining that undeclared nuclear material or nuclear activity provide a kind of important method, it mainly carries out particulate isotope analysis by or its peripheral gauge wipe samples inner at nuclear facilities, obtains nuclear activity information important near sampled point.Sample through wiping the environmental sample obtained can not directly analyze, first particulate samples will be separated from wiping carrier (as cotton, filter paper etc.), present stage, widely used particle recovering method was mainly sonic oscillation and negative pressure shock.
Particle recovery rate to the core evaluation index of particle recovering method, the particulate number namely reclaimed from wipe samples and the ratio of sampling particulate number.But the method for measurement particle recovery rate still unsuitable so far.Japan Atomic energy research and development organization (J Α E Α) proposes and measures particle recovery rate by X-ray fluorescence spectra analytic approach (XRF); uranium-bearing particulate is replaced to test with leaded particulate; to reclaim content plumbous on the carrier of front and back than approximate characterizing particles number ratio; estimation particle recovery rate; if but consider that diameter of particle does not wait these actual conditions; content than not being equal to particulate number ratio, so by means of only measurement content estimate that recovery method is inappropriate.China Atomic Energy Science Research Institute (CI Α E) to be combined mensuration particle recovery rate by scanning electron microscope (SEM) and energy dispersive spectrometry (EDX).In measuring process, to particulate carrier Stochastic choice observation station before and after recovery, SEM-EDX observation is carried out to the particulate on grab sample point and adds up, estimate the particulate sum before and after reclaiming, the ratio estimation particle recovery rate both using.Although the measurement result of the method is the ratio of particulate number really, owing to have passed through the stochastic sampling of multistep, statistic bias is larger.
Summary of the invention
(1) goal of the invention
Problem existing for prior art, the invention provides method that is simple, efficient, Measurement accuracy particle recovery rate.
(2) technical scheme
In order to solve the problem existing for prior art, the technical scheme that the present invention proposes is as follows:
Utilize energy spectrometer to measure on carrier and reclaim rear and before reclaiming particulate activity count ratio, and as the recovery, particulate used is the radioactive particulate that composition, particle diameter are all identical.
Its preferred version is:
First the wiping carrier being attached with the uranium oxide particle that height is dense, composition is identical, particle diameter is identical is put into alpha energy spectrum sample cavity to measure 12 ~ 48 hours, record counting; Then the particulate on carrier is reclaimed, the particulate of recovery is put into alpha energy spectrum sample cavity measurement count under similarity condition, after recovery with reclaim before the ratio of measurement count be particle recovery rate.Described high-enriched uranium refers to
235the uranium of U abundance>=20%.
(3) beneficial effect
The measuring method of particle recovery rate provided by the present invention; utilize energy spectrometer and composition, radioactive particulate that particle diameter is identical combines; by alpha energy spectrum instrument measure reclaim after with reclaim before radiocounting can be used as its number ratio than namely; thus the recovery of particulate can be drawn simply, efficiently, accurately; avoid the problem that the count ratio utilizing the measurement of XRF method to cause is not particulate number ratio, it also avoid simultaneously and utilize SEM-EDX to observe the problem of adding up the number statistic bias caused.
Particulate used is the particulate that height is dense, single dispersing, particle diameter are identical,
235u abundance is high, is conducive to alpha energy spectrum instrument and counts and shorten Measuring Time, can obtain the recovery of particulate efficiently.
Embodiment
Below in conjunction with embodiment, the present invention is further elaborated.
embodiment 1
The step of this method is as follows:
(1) choose and be attached with
235u abundance is that alpha energy spectrum sample cavity measurement 24 hours put into by the cleaning cotton cloth of the uranium oxide particle that height is dense, single dispersing, particle diameter are identical (particle diameter is 1 μm) of 33%, records the counting before recovery;
(2) recovery of sonic oscillation particulate is carried out to the particulate on carrier.Concrete operation step is: be cut into small pieces by the cotton in step (1), puts into sample hose and adds isoamyl acetate as dispersion solvent, carries out sonic oscillation 20 minutes, subsequently, by hanging drop to pallet after being heating and curing, prepare measure.
(3) reclaim the pallet of particulate put into alpha energy spectrum by being attached with, keeps consistent with the measuring condition in step (1), record the counting after recovery, after recovery with recovery before the ratio of twice counting be particle recovery rate, about 50%.
embodiment 2
The method used with embodiment 1, step, surveying instrument, wiping carrier, particulate are identical; ethanol unlike carrying out the dispersion solvent that adds when sonic oscillation reclaims to particulate; count measurement after reclaiming particulate and before reclaiming, Measuring Time is 12 hours, show that particle recovery rate is 45%.
embodiment 3
The method used with embodiment 1, step, surveying instrument, wiping carrier, particulate are identical; heptane unlike carrying out the dispersion solvent that adds when sonic oscillation reclaims to particulate; count measurement after reclaiming particulate and before reclaiming, Measuring Time is 12 hours, show that particle recovery rate is 47%.
embodiment 4
The method used with embodiment 1, step, surveying instrument, dispersion solvent, particulate are identical, are filter paper unlike wiping carrier used, and the count measurement after reclaiming particulate and before reclaiming, Measuring Time is 48 hours, show that particle recovery rate is 49%.
embodiment 5
The method used with embodiment 1, step, surveying instrument, dispersion solvent, particulate are identical; nucleopore membranes unlike wiping carrier used; the method reclaiming particulate is that negative pressure is clashed into; count measurement after particulate is reclaimed and before reclaiming; Measuring Time is 24 hours, show that particle recovery rate is 46%.
embodiment 6
The method used with embodiment 1, step, surveying instrument, dispersion solvent particulate are identical; method unlike recovery particulate used is that negative pressure is clashed into; count measurement after reclaiming particulate and before reclaiming, Measuring Time is 24 hours, show that particle recovery rate is 43%.
Claims (1)
1. the measuring method of particle recovery rate, is characterized in that, the method be by measure carrier reclaims after with reclaim before the radiocounting of particulate than as its number ratio; Particulate used is that the height that composition, particle diameter are all identical is dense, single dispersing uranium oxide particle; The instrument of the radiocounting of the particulate after described measurement is reclaimed and before reclaiming is alpha energy spectrum instrument; Described carrier is wiping cotton, filter paper or nucleopore membranes;
Steps of the method are:
(1) choose the wiping cotton, filter paper or the nucleopore membranes that are attached with the uranium oxide particle that height is dense, single dispersing, particle diameter are identical and put into alpha energy spectrum instrument sample cavity measurement 12 ~ 48 hours, record the counting before recovery;
(2) recovery of sonic oscillation particulate is carried out to the particulate in wiping cotton, filter paper or the nucleopore membranes described in step (1), concrete operation step is: cotton, filter paper or nucleopore membranes in step (1) are cut into small pieces, put into sample hose and add ethanol, isoamyl acetate or heptane as dispersion solvent, carry out sonic oscillation 20 minutes, subsequently by hanging drop to pallet after being heating and curing, prepare measure;
(3) reclaim the pallet of particulate put into alpha energy spectrum instrument by being attached with, keeps consistent with the measuring condition in step (1), record the counting after recovery, after recovery with recovery before the ratio of twice counting be particle recovery rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210283048.9A CN102768221B (en) | 2012-08-10 | 2012-08-10 | The measuring method of particle recovery rate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210283048.9A CN102768221B (en) | 2012-08-10 | 2012-08-10 | The measuring method of particle recovery rate |
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| CN102768221A CN102768221A (en) | 2012-11-07 |
| CN102768221B true CN102768221B (en) | 2016-01-20 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655422A (en) * | 2009-09-02 | 2010-02-24 | 中国原子能科学研究院 | Device for recovering particles by vacuum collision method |
| CN102095620A (en) * | 2010-12-23 | 2011-06-15 | 中国原子能科学研究院 | Method for recovering particles of wiping sample by using conductive adhesive as carrier |
| CN102502729A (en) * | 2011-09-22 | 2012-06-20 | 清华大学 | Method for producing alumina by using pulverized fuel ash |
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2012
- 2012-08-10 CN CN201210283048.9A patent/CN102768221B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655422A (en) * | 2009-09-02 | 2010-02-24 | 中国原子能科学研究院 | Device for recovering particles by vacuum collision method |
| CN102095620A (en) * | 2010-12-23 | 2011-06-15 | 中国原子能科学研究院 | Method for recovering particles of wiping sample by using conductive adhesive as carrier |
| CN102502729A (en) * | 2011-09-22 | 2012-06-20 | 清华大学 | Method for producing alumina by using pulverized fuel ash |
Non-Patent Citations (1)
| Title |
|---|
| 抽气碰撞法回收擦拭样品上铀微粒方法;王同兴等;《原子能科学技术》;20110131;第45卷(第1期);112-116 * |
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| CN102768221A (en) | 2012-11-07 |
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