CN104597481A - Gas sample calibration standard source and preparation method thereof - Google Patents
Gas sample calibration standard source and preparation method thereof Download PDFInfo
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- CN104597481A CN104597481A CN201410836232.0A CN201410836232A CN104597481A CN 104597481 A CN104597481 A CN 104597481A CN 201410836232 A CN201410836232 A CN 201410836232A CN 104597481 A CN104597481 A CN 104597481A
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Abstract
The invention relates to a gas sample calibration standard source and a preparation method thereof; a low-density foam ball is used as a substrate material of a calibration source; the calibration source is uniformly distributed in the substrate material; and the density is close to the gas sample. The gas sample calibration standard source and the preparation method thereof solve the technical problem of the efficiency calibration in measuring the activity of the gas sample.
Description
Technical field
The present invention relates to a kind of gaseous sample scale merit source and preparation method thereof, be specifically related to gaseous sample gamma-rays efficiency calibration.
Background technology
The efficiency of accurate calibration measuring system is the key of gamma energy spectrum method measurement gas activity.Optimal efficiency calibration method adopts the gas to be measured of known activity directly to carry out efficiency calibration to detection system, but due to the gas to be measured general half life period shorter, and not easily to obtain, usually adopt liquid standard source to carry out efficiency calibration.The density of liquid calibration source is about 1g/cm
3, differ greatly with gaseous sample self-absorption, the correction of self absorption effect need be carried out, and increase the difficulty of Gamma spectrum analysis sometimes because of the irregular of source capsule shape.Document " development for the analog gas calibration source that HPGe detector efficiency is demarcated " (atomic energy science and technology, 2010,44th volume the 7th phase) disclose the method utilizing thin slice sponge as calibration source matrix composition gaseous sample calibration source, but due to liquid gravity effect, can be larger than top activity bottom calibration source, make standard source skewness in matrix.Therefore, be necessary develop with gaseous sample similar density, substantially without self-absorption difference, while be evenly distributed again gas calibration source to carry out efficiency calibration.
Summary of the invention
The object of the invention is to provide a kind of gaseous sample scale merit source and preparation method thereof, and which solve the self-absorption of existing liquid calibration source and differ greatly, thin slice sponge calibration source technical barrier pockety, can improve the accuracy of gaseous sample scale.
Technical solution of the present invention is:
A kind of gaseous sample scale merit source, comprise box body, upper cover, standard solution and calibration source matrix, its special character is:
Described box body and upper cover form a seal chamber, the physical dimension of described seal chamber and material identical with gaseous sample source capsule to be measured,
Described standard solution and calibration source matrix are positioned at box body;
Described calibration source matrix is expandable polystyrene particle.
The particle diameter of above-mentioned expandable polystyrene particle is 1 ~ 2mm; Density is less than 0.02g/cm
3.
Above-mentioned upper cover and box body are by bonding or being welded into closed container.
Above-mentioned upper cover and cell material are stainless steel, teflon, tygon, nylon, carbon fiber, aluminium, copper or plastic scintillant.
The even titration of above-mentioned standard fountain solution is in calibration source matrix.
The method for making in above-mentioned gaseous sample scale merit source, its special character is: comprise the following steps:
1) one deck calibration source matrix is spread at scale source capsule box body bottom even, even titrimetric standard solution;
2) one deck calibration source matrix is repaved, even titrimetric standard solution,
3) step 2 is repeated, until desired height;
4) after solution dries in the shade, calibration source box cover 1 and scale source capsule box body 2 are carried out bonding or welded seal;
5) vibrations more than 30 minutes are in an oscillator placed in the scale merit source made, make calibration source matter distribution even.
The particle diameter of above-mentioned expandable polystyrene particle is 1 ~ 2mm; Density is less than 0.02g/cm
3.
Above-mentioned titration adopts electronic liquid trasferring device.
The beneficial effect that the present invention has:
1, the present invention gaseous sample scale merit source of utilizing expandable polystyrene particle to prepare, density is less than 0.02g/cm
3, solve the problem of self-absorption when adopting fluid supply scale gamma-rays efficiency.
2, the present invention adopts particle ball to prepare scale merit source, then shakes more than 30 minutes in an oscillator, solves the calibration source problem pockety that thin slice sponge makes as matrix.
3, present invention employs low-density matrix production standard source, no matter source capsule rule is irregular, all without self-absorption difference, solve existing calibration source can increase the difficulty of Gamma spectrum analysis problem because of the irregular of source capsule shape.
Accompanying drawing explanation
Fig. 1 is gaseous sample scale merit source structure schematic diagram of the present invention;
Wherein 1-gaseous sample calibration source upper cover; 2-gaseous sample calibration source box body; 3-gaseous sample calibration source matrix.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
As shown in Figure 1, gaseous sample scale merit source of the present invention comprises gaseous sample calibration source box cover 1, gaseous sample calibration source box body 2 and gaseous sample calibration source matrix 3.
In order to reduce the efficiency variance that standard source causes because shape is different with material from testing sample source, the physical dimension of gas calibration source box cover 1 of the present invention, gaseous sample scale source capsule box body 2 is identical with gaseous sample source capsule to be measured with material, the optional stainless steel of concrete material, teflon, tygon, nylon, carbon fiber, aluminium, copper or plastic scintillant.
During in order to solve thin slice sponge as calibration source matrix, standard source is problem pockety in matrix, and calibration source matrix of the present invention is expandable polystyrene particle.
Expandable polystyrene particle spherolite footpath is too large, and the particle ball quantity in source capsule is few, standard source skewness; Particle diameter is too little, and host material density increases, and increase self-absorption impact, select particle diameter to be 1 ~ 2mm, density is less than 0.02g/cm for this reason
3.
Gaseous sample scale merit source of the present invention can make according to following process:
First, spread one deck calibration source matrix 3 at scale source capsule box body 1 bottom even, with the even titrimetric standard solution of electronic liquid trasferring device;
Then, repave one deck calibration source matrix 3, even titrimetric standard solution, repeats this step, until desired height;
After solution dries in the shade, calibration source box cover 1 and scale source capsule box body 2 are carried out bonding or welded seal;
Finally, the scale merit source made is placed and shakes more than 30 minutes in an oscillator, calibration source is evenly distributed.
By following formula computing scale source radiation activity standard:
A＝c·m
In formula, c is standard solution specific activity; M is the standard solution quality of titration.
Because scale sample substrate density is only 0.02g/cm
3, for
133xe 81keV gamma-rays, self-absorption impact is less than 0.2%, and this is suitable with the self-absorption of gas self; For energetic gamma rays, this scale sample self-absorption impact can be ignored.
Claims (8)
1. a gaseous sample scale merit source, comprises box body, upper cover, standard solution and calibration source matrix, it is characterized in that:
Described box body and upper cover form a seal chamber, the physical dimension of described seal chamber and material identical with gaseous sample source capsule to be measured,
Described standard solution and calibration source matrix are positioned at box body;
Described calibration source matrix is expandable polystyrene particle.
2. gaseous sample scale merit source according to claim 1, is characterized in that: the particle diameter of described expandable polystyrene particle is 1 ~ 2mm; Density is less than 0.02g/cm
3.
3. gaseous sample scale merit source according to claim 1 and 2, is characterized in that:
Described upper cover and box body are by bonding or being welded into closed container.
4. gaseous sample scale merit source according to claim 1, is characterized in that: described upper cover and cell material are stainless steel, teflon, tygon, nylon, carbon fiber, aluminium, copper or plastic scintillant.
5. gaseous sample scale merit source according to claim 1, is characterized in that: the even titration of described standard fountain solution is in calibration source matrix.
6., according to the method for making in the gaseous sample scale merit source one of claim 1-5 Suo Shu, it is characterized in that: comprise the following steps:
1) one deck calibration source matrix is spread at scale source capsule box body bottom even, even titrimetric standard solution;
2) one deck calibration source matrix is repaved, even titrimetric standard solution,
3) step 2 is repeated, until desired height;
4) after solution dries in the shade, calibration source box cover 1 and scale source capsule box body 2 are carried out bonding or welded seal;
5) vibrations more than 30 minutes are in an oscillator placed in the scale merit source made, make calibration source matter distribution even.
7. the method for making in gaseous sample scale merit source according to claim 6, is characterized in that: the particle diameter of described expandable polystyrene particle is 1 ~ 2mm; Density is less than 0.02g/cm
3.
8. the method for making in the gaseous sample scale merit source according to claim 6 or 7, is characterized in that: described titration adopts electronic liquid trasferring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410836232.0A CN104597481A (en) | 2014-12-26 | 2014-12-26 | Gas sample calibration standard source and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410836232.0A CN104597481A (en) | 2014-12-26 | 2014-12-26 | Gas sample calibration standard source and preparation method thereof |
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| CN104597481A true CN104597481A (en) | 2015-05-06 |
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| CN201410836232.0A Pending CN104597481A (en) | 2014-12-26 | 2014-12-26 | Gas sample calibration standard source and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783176A (en) * | 2016-08-25 | 2018-03-09 | 中国辐射防护研究院 | A kind of method using normal fluid source calibration liquid effluent monitor |
| CN108957519A (en) * | 2018-05-22 | 2018-12-07 | 中国原子能科学研究院 | A kind of preparation method in radgas mock standard source |
| CN109085639A (en) * | 2018-08-20 | 2018-12-25 | 中国原子能科学研究院 | It is a kind of133The preparation and detection efficient bearing calibration of Xe simulation gas source |
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| CN86204889U (en) * | 1986-07-04 | 1987-06-24 | 中国原子能科学研究院 | High-energy r ray source device for calibration |
| CN103424762A (en) * | 2013-07-25 | 2013-12-04 | 中国原子能科学研究院 | Standard source for radioactive waste barrel segmenting gamma scanning device scales |
| JP2014010065A (en) * | 2012-06-29 | 2014-01-20 | National Institute Of Advanced Industrial & Technology | Radiation source manufacturing method and apparatus for the same |
| CN203759254U (en) * | 2014-03-18 | 2014-08-06 | 西北核技术研究所 | Flat source box for efficiency calibration of gram-scale solid powder sample |
| CN204347267U (en) * | 2014-12-26 | 2015-05-20 | 北京放射性核素实验室 | A kind of gaseous sample scale merit source |
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| CN86204889U (en) * | 1986-07-04 | 1987-06-24 | 中国原子能科学研究院 | High-energy r ray source device for calibration |
| JP2014010065A (en) * | 2012-06-29 | 2014-01-20 | National Institute Of Advanced Industrial & Technology | Radiation source manufacturing method and apparatus for the same |
| CN103424762A (en) * | 2013-07-25 | 2013-12-04 | 中国原子能科学研究院 | Standard source for radioactive waste barrel segmenting gamma scanning device scales |
| CN203759254U (en) * | 2014-03-18 | 2014-08-06 | 西北核技术研究所 | Flat source box for efficiency calibration of gram-scale solid powder sample |
| CN204347267U (en) * | 2014-12-26 | 2015-05-20 | 北京放射性核素实验室 | A kind of gaseous sample scale merit source |
Non-Patent Citations (2)
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|---|
| SUPIAN BIN SAMAT ET AL.: "Characteristics of prepared gamma-ray calibration sources for radioactivity measurement of environmental and radiation control samples", 《JAERI-TECH》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783176A (en) * | 2016-08-25 | 2018-03-09 | 中国辐射防护研究院 | A kind of method using normal fluid source calibration liquid effluent monitor |
| CN108957519A (en) * | 2018-05-22 | 2018-12-07 | 中国原子能科学研究院 | A kind of preparation method in radgas mock standard source |
| CN108957519B (en) * | 2018-05-22 | 2020-11-10 | 中国原子能科学研究院 | Preparation method of radioactive gas simulation standard source |
| CN109085639A (en) * | 2018-08-20 | 2018-12-25 | 中国原子能科学研究院 | It is a kind of133The preparation and detection efficient bearing calibration of Xe simulation gas source |
| CN109085639B (en) * | 2018-08-20 | 2020-08-21 | 中国原子能科学研究院 | A kind of133Preparation of Xe simulation gas source and detection efficiency correction method |
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Application publication date: 20150506 |