CN104597473A - Inflatable beta detector for measuring radioactive gas nuclide - Google Patents
Inflatable beta detector for measuring radioactive gas nuclide Download PDFInfo
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- CN104597473A CN104597473A CN201410836279.7A CN201410836279A CN104597473A CN 104597473 A CN104597473 A CN 104597473A CN 201410836279 A CN201410836279 A CN 201410836279A CN 104597473 A CN104597473 A CN 104597473A
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- cylindrical shell
- inflatable
- detector
- radioactive gas
- photomultiplier
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Abstract
The invention relates to an inflatable beta detector for measuring radioactive gas nuclide. The detector comprises a bottom part, a barrel body, an inflating pipeline, a valve, a photoelectric multiplier tube, a reflecting layer and a light avoiding layer; the bottom part, the barrel body, the inflating pipeline and the valve form a hollow cylindrical closed container; a radioactive gas nuclide sample fills a cavity of the detector; the detector is used as a source box (pressure resistance ranges from 0-2.5*105Pa) bearing a gas sample and can also be used as the detector for measuring beta rays; 4 Pi solid angles are provided for the gas sample, and therefore, the detecting efficiency of the radioactive gas nuclide beta rays and the energy resolution are increased.
Description
Technical field
The present invention relates to a kind of gas-filled detector measured for radioactive gas nuclide, be specifically related to radioactive gas nuclide beta-ray measurement.
Background technology
Along with the increase gradually of domestic and international nuclear power station quantity; there is abnormal release or accident in nuclear facilities; radgas can be caused to leak in air; bring new environmental monitoring problem; due to the diffusion dilution also constantly decay in an atmosphere of these radgass; in air, radioxenon activity is very low; therefore; carry out trace level activity Activity of radioactive gas to measure; improve gas nuclide activity measurement detection sensitivity; can be nuclear accident early warning, emergent and assessment provides valuable data, the protection public, protection of the environment radiation safety are played a positive role.
β-γ coincidence measurement method is a kind of gaseous radioactivity Nuclide measurement method that detection sensitivity is higher, document " in CTBT inert gas xenon sample radioactive xenon isotope activity measurement method " (nuclear electronics and Detection Techniques, 2011, 31st volume the 2nd phase) describe the method adopting plastic scintillant beta rediation detector and NaI (Tl) gamma detector coincidence measurement xenon isotope activity, for improving resolution and the sensitivity of β-γ coincidence measurement method further, we propose to adopt plastic scintillant beta rediation detector and HPGe detector to carry out the method for coincidence measurement, but existing beta rediation detector is owing to placing photomultiplier in two ends, can not with HPGe detector with the use of, and volume (sample capacity) is less, larger volume sample cannot be met measure.
Summary of the invention
In order to solve existing beta rediation detector cannot with HPGe detector with the use of technical matters, the invention provides a kind of for radioactive gas nuclide measure inflatable beta rediation detector.
Technical solution of the present invention is:
For the inflatable beta rediation detector that radioactive gas nuclide is measured, its special character is: comprise
Bottom, cylindrical shell, photomultiplier, loading line and valve;
Described bottom and photomultiplier lay respectively at cylindrical shell two ends and cylindrical shell forms a closed container jointly, and the material of described bottom and cylindrical shell is detecting material,
Described loading line is connected with cylindrical shell by the through hole be arranged on cylinder lateral wall, and described valve is arranged on loading line,
Described bottom and cylindrical shell are also provided with reflector layer outward, and the outermost of described gas-filled detector is also enclosed with lucifuge layer.
The shape of above-mentioned bottom and cylindrical shell all with the mating shapes of photomultiplier.
The shape of above-mentioned photomultiplier is cylindrical, and described cylindrical shell is the hollow cylinder with photomultiplier mating shapes, and described bottom is the disk that shape and cylindrical shell match.
The external diameter of above-mentioned bottom is 50mm, wall thickness 5mm;
The diameter of described cylinder is 50mm, and thickness is 2mm;
Described closed container spatial volume is 13mL.
Above-mentioned detecting material is plastic scintillant.
What be also wrapped in the reflector layer of bottom outer surface is specular layer, and the reflector layer be wrapped in outside cylindrical shell is diffuse reflector.
Above-mentioned specular layer is aluminium foil or ESR high reflectance minute surface reflectance coating,
Described diffuse reflector is poly tetrafluoroethylene,
The material of described lucifuge layer is black tape or aluminium.
Bond between above-mentioned bottom and cylindrical shell body, bond between described cylindrical shell and loading line.
The beneficial effect that the present invention has:
1, detector of the present invention is one-sided photomultiplier transit tubular construction, can with HPGe detector with the use of.
2, detector of the present invention is the cylindrical structure of hollow, it is the source capsule that beta rediation detector carries again gaseous sample, achieve again Beta-ray efficient detection, β-ray detector efficiency is greater than 90%, compared with the β efficiency of existing detector 75%, there is the progress of highly significant, the needs that trace level activity Activity of radioactive gas is measured can be met.
3, detector bottom thickness of the present invention is only 2mm, reduces and absorbs gamma-rays.
4, panel detector structure of the present invention is exquisite, and beta-ray detection efficiency is high, external diameter 50mm, can mate very well with photomultiplier.
5, detector inner space of the present invention volume is 13mL, can meet larger volume sample and measure.
Accompanying drawing explanation
Fig. 1 is hollow inflatable formula plastic scintillator detector assembling pre-structure schematic diagram;
Fig. 2 is structural representation after the assembling of hollow inflatable formula plastic scintillator detector;
Fig. 3 is structural representation after the encapsulation of hollow inflatable formula plastic scintillator detector;
Fig. 4 is that β-γ meets acquisition
133the original gamma spectrum of Xe sample and meet gamma spectrum;
1-bottom; 2-cylindrical shell; 3-photomultiplier; 4-high voltage interface; 5-signaling interface; 6-valve; 7-loading line; 8-specular reflection film; 9-diffusive reflective film; 10-lucifuge layer; 11-
133the original gamma spectrum of Xe; 12-
133xe meets gamma spectrum.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As Figure 1-3, a kind of gas-filled detector of the present invention comprises bottom 1, cylindrical shell 2, photomultiplier 3, loading line 7 and valve 6, high voltage interface 4, signaling interface 5, bottom 1, the two ends that photomultiplier 3 is separately positioned on cylindrical shell 2 make cylindrical shell 2 form the container of hollow, bottom 1 and cylindrical shell 2 material are detecting material, loading line 7 is connected with cylindrical shell 2 by the through hole be arranged on cylindrical shell 2 sidewall, valve 6 is arranged on loading line 7, when encapsulating, also need paste reflector layer outside cylindrical shell 2 and bottom 1, lucifuge layer 10 is wrapped with in the outermost of whole gas-filled detector.
The detection principle of detector of the present invention is: β ray and detecting material interact and produce fluorescence, and fluorescence reflects into through emission layer, into photomultiplier, light signal is converted to electric signal.Detecting material of the present invention can be selected outside plastic scintillant, and other material is not too easily processed.
More than be described as the basic structure of gas-filled detector of the present invention, this structure one end is photomultiplier 3, the other end is bottom 1, the one end arranging bottom 1 is placed on HPGe detector, realize meeting of gas-filled detector and HPGe detector, because detector of the present invention only has a photomultiplier 3, therefore, in order to improve the detection efficiency of detector of the present invention, the effect that the present invention increases efficient reflector layer in the outside of bottom 1 and the lateral wall of cylindrical shell 2 is the fluorescence losses preventing β ray from producing, and improves detection sensitivity and efficiency.In addition, be prevent extraneous light from entering in the effect of the outside surface parcel lucifuge layer 10 of whole detector, cause unnecessary signal.
In addition, the shape of bottom 1 of the present invention and cylindrical shell 2 not necessarily circle, other shape is also passable, but photomultiplier is generally circular now, for convenience of coupling, the optional circle of bottom shape of the present invention, the shape of cylindrical shell is optional cylindrical, and in addition, circular detection efficiency is also high.
Further, the present invention has carried out difference design to reflector layer, is specular layer 8 in the reflection horizon of bottom 1 outer wrapping, the photomultiplier 3 direction reflection efficiently arranged to opposite to make fluorescence; Be diffuse reflector 9 in the reflection horizon of cylindrical shell 2 outer wrapping again, its advantage is by repeatedly diffuse reflection, and fluorescence is reflected into as far as possible into photomultiplier 3.
Further, loading line 7 material of the present invention is stainless steel, aluminium or copper, specular reflection film 8 is aluminium foil or ESR high reflectance minute surface reflectance coating, thickness is 200 μm, absorb minimum to gamma-rays, wherein ESR high reflectance minute surface reflecting film reflects rate reaches 99%, ensures that the fluorescent reflection produced in plastic scintillant enters photomultiplier; Diffusive reflective film 9 is poly tetrafluoroethylene, and reflectivity reaches 98%, and lucifuge material is black tape or aluminium.Selected reflection and lucifuge material atom ordinal number all lower, to reduce in coincidence measurement it to gamma-ray absorption.
Further, applicant measures to meet larger volume sample and improves detection efficiency further, further optimization has been carried out to physical dimension of the present invention, specifically: cylindrical shell external diameter is 50mm, mate with photomultiplier photocathode, direct silicone oil is of coupled connections, wall thickness 5mm, improves phosphor collection efficiency; Through hole on detecting material sidewall is 2mm; Base diameter is 50mm, and thickness is 2mm, can reduce it to gamma-ray absorption; Closed container spatial volume is 13mL, can meet larger volume sample and measure.Length-diameter ratio poorly limits in addition, and volume can do large, and having done greatly efficiency can decrease, and too littlely not too easily processes.
Vacuumize test and voltage-withstand test to hollow inflatable formula plastic scintillator detector of the present invention, result shows that this detector can carry 2.5 × 10
5the pressure of Pa, favorable sealing property.
Be filled with
133xe sample, adopt following formula detector beta-ray detection efficiency of the present invention is tested, measurement meet power spectrum 12 and original power spectrum 11 is shown in Fig. 4, result shows, this detector pair
133xe beta-ray detection efficiency is greater than 90%.
In formula, n
γfor original spectrum gamma-rays peak counting rate;
N
γ cfor meeting spectrum gamma-rays peak counting rate;
P
βfor β ray emission probability.
Claims (8)
1., for the inflatable beta rediation detector that radioactive gas nuclide is measured, it is characterized in that: comprise bottom, cylindrical shell, photomultiplier, loading line and valve;
Described bottom and photomultiplier lay respectively at cylindrical shell two ends and cylindrical shell forms a closed container jointly, and the material of described bottom and cylindrical shell is detecting material,
Described loading line is connected with cylindrical shell by the through hole be arranged on cylinder lateral wall, and described valve is arranged on loading line,
Described bottom and cylindrical shell are also provided with reflector layer outward, and the outermost of described gas-filled detector is also enclosed with lucifuge layer.
2. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 1, is characterized in that:
The shape of described bottom and cylindrical shell all with the mating shapes of photomultiplier.
3. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 2, is characterized in that:
The shape of described photomultiplier is cylindrical, and described cylindrical shell is the hollow cylinder with photomultiplier mating shapes, and described bottom is the disk that shape and cylindrical shell match.
4. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 3, is characterized in that:
The external diameter of described bottom is 50mm, wall thickness 5mm;
The diameter of described cylinder is 50mm, and thickness is 2mm;
Described closed container spatial volume is 13mL.
5., according to the inflatable beta rediation detector measured for radioactive gas nuclide described in claim 1 or 2 or 3 or 4, it is characterized in that: described detecting material is plastic scintillant.
6. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 5, is characterized in that:
What be wrapped in the reflector layer of bottom outer surface is specular layer, and the reflector layer be wrapped in outside cylindrical shell is diffuse reflector.
7. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 6, is characterized in that:
Described specular layer is aluminium foil or ESR high reflectance minute surface reflectance coating,
Described diffuse reflector is poly tetrafluoroethylene,
The material of described lucifuge layer is black tape or aluminium.
8. the inflatable beta rediation detector measured for radioactive gas nuclide according to claim 7, is characterized in that:
Bond between described bottom and cylindrical shell body, bond between described cylindrical shell and loading line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410836279.7A CN104597473A (en) | 2014-12-26 | 2014-12-26 | Inflatable beta detector for measuring radioactive gas nuclide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410836279.7A CN104597473A (en) | 2014-12-26 | 2014-12-26 | Inflatable beta detector for measuring radioactive gas nuclide |
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| CN104597473A true CN104597473A (en) | 2015-05-06 |
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| CN201410836279.7A Pending CN104597473A (en) | 2014-12-26 | 2014-12-26 | Inflatable beta detector for measuring radioactive gas nuclide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405615A (en) * | 2016-08-26 | 2017-02-15 | 北京放射性核素实验室 | Device and method for realizing high sensitivity detection on radioactive gas nuclide activity |
| CN107272044A (en) * | 2017-07-07 | 2017-10-20 | 中国工程物理研究院核物理与化学研究所 | One kind measurement85Kr interior Gas Filled Detector |
| CN109814145A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of low adsorption large volume radgas measurement container |
| CN109991646A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Si-PINX ray detector measures radgas measuring chamber |
| CN111341640A (en) * | 2020-03-10 | 2020-06-26 | 中国科学院近代物理研究所 | Method and device for pouring sealant into photomultiplier tube assembly |
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| JPS62133378A (en) * | 1985-12-06 | 1987-06-16 | Toshiba Corp | Plastic scintillator detector |
| WO2004040254A2 (en) * | 2001-05-04 | 2004-05-13 | Remote Data Technologies, Llc | Real-time remotely programmable radioactive gas detecting and measuring system |
| CN102628954A (en) * | 2012-03-29 | 2012-08-08 | 西北核技术研究所 | Neutron detector based on polyethylene combined gas scintillator |
| CN204374429U (en) * | 2014-12-26 | 2015-06-03 | 北京放射性核素实验室 | A kind of inflatable beta rediation detector measured for radioactive gas nuclide |
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2014
- 2014-12-26 CN CN201410836279.7A patent/CN104597473A/en active Pending
Patent Citations (4)
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| JPS62133378A (en) * | 1985-12-06 | 1987-06-16 | Toshiba Corp | Plastic scintillator detector |
| WO2004040254A2 (en) * | 2001-05-04 | 2004-05-13 | Remote Data Technologies, Llc | Real-time remotely programmable radioactive gas detecting and measuring system |
| CN102628954A (en) * | 2012-03-29 | 2012-08-08 | 西北核技术研究所 | Neutron detector based on polyethylene combined gas scintillator |
| CN204374429U (en) * | 2014-12-26 | 2015-06-03 | 北京放射性核素实验室 | A kind of inflatable beta rediation detector measured for radioactive gas nuclide |
Non-Patent Citations (3)
| Title |
|---|
| FENG XIE ET AL: "Single channel beta-gamma coincidence system for radioxenon measurement using well-type HPGe and plastic scintillator detectors", 《NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH A》 * |
| MATTHEW W.COPPER ET AL: "IMPROVED β-γ COINCIDENCE DETECTOR FOR RADIOXENON DETECTION", 《27TH SEISMIC RESEARCH REVIEW:GROUND-BASED NUCLEAR EXPLOSION MONITORING TECHNOLOGIES》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405615A (en) * | 2016-08-26 | 2017-02-15 | 北京放射性核素实验室 | Device and method for realizing high sensitivity detection on radioactive gas nuclide activity |
| CN107272044A (en) * | 2017-07-07 | 2017-10-20 | 中国工程物理研究院核物理与化学研究所 | One kind measurement85Kr interior Gas Filled Detector |
| CN107272044B (en) * | 2017-07-07 | 2019-01-15 | 中国工程物理研究院核物理与化学研究所 | A kind of measurement85The interior Gas Filled Detector of Kr |
| CN109991646A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Si-PINX ray detector measures radgas measuring chamber |
| CN109991646B (en) * | 2017-12-31 | 2021-05-28 | 中国人民解放军63653部队 | Measuring chamber for measuring radioactive gas by Si-PINX ray detector |
| CN109814145A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of low adsorption large volume radgas measurement container |
| CN111341640A (en) * | 2020-03-10 | 2020-06-26 | 中国科学院近代物理研究所 | Method and device for pouring sealant into photomultiplier tube assembly |
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Application publication date: 20150506 |