CN2056758U - Improved compound liquid flash detector - Google Patents
Improved compound liquid flash detector Download PDFInfo
- Publication number
- CN2056758U CN2056758U CN 89219632 CN89219632U CN2056758U CN 2056758 U CN2056758 U CN 2056758U CN 89219632 CN89219632 CN 89219632 CN 89219632 U CN89219632 U CN 89219632U CN 2056758 U CN2056758 U CN 2056758U
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- China
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- cover
- sample bottle
- spire
- detector
- photoconduction
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Abstract
The utility model discloses an improved compound liquid flash detector which overcomes the light talk and is characterized in that the upper part of the sample bottle in the existing congener detector is additionally provided with a metal light shielding top cap. Not only the background count caused by light talk is reduced, but also the detection efficiency of the utility model is reduced. The effect of using 70 mm lead or 100 mm iron shield is the same with using 18-20 mm sealing lead chamber according to the utility model. The natural background count is smaller than 30 cpm, and the repetition error of measurement is smaller than 3%.
Description
The utility model relates to the detector of liquid scintillation counter, promptly a kind of improved type liquid scintillator detector that meets.
The known type liquid that meets dodges the detector ubiquity causes instrument sample-out count increase because of the mutual optical crosstalk of two photomultipliers situation, general at present employing is provided with optical filter, polariscope, radome or light trap method and reduces optical crosstalk, but the common defects of these methods is when reducing the instrument background, has also reduced the detection efficiency of instrument.
The purpose of this utility model provides a kind of novel type liquid that meets and dodges detector, and it can reduce the sample-out count that causes because of optical crosstalk, again the detection efficiency of lowering apparatus not.
The utility model is achieved in that existing and meets on the basis that type liquid dodges detector, design a kind of metal and cover the sample bottle upper end of spire cover reversed stream at the photoconduction inner chamber of measuring the darkroom, cover in the space segment in sample bottle the first half and the photoconduction, the mutual optical crosstalk that stops two photomultipliers, a kind of specifically improved type liquid scintillator detector that meets comprises the sealing vitriol chamber, removable top cover, photomultiplier, the sphere photoconduction, the sample bottle of scintillation solution is housed, the polishing mirror, cushion block, the lifting push rod of band spring, cover optical shutter, hydraucone, be provided with the cylindric spire cover that covers of a band upper base of making by low background metal material at sphere photoconduction inner chamber, cover the interior scintillation solution liquid level of spire cover lower ending opening edge and sample bottle on same surface level, the external diameter of its internal diameter and sample bottle matches, and its upper base inboard is provided with an annulus boss.
Positive effect of the present utility model is the detection efficiency of lowering apparatus neither, can reduce the sample-out count that the mutual optical crosstalk because of two photomultipliers causes again.
Now in conjunction with the accompanying drawings and embodiments the utility model is done to describe in further detail:
Fig. 1 is a kind of improved structural representation that meets the type liquid scintillator detector.
As shown in Figure 1, a kind of improved meet the sealing vitriol chamber 10 and 10 that the type liquid scintillator detector comprises that two horizontal symmetrical place ', each sealing vitriol chamber 10 or 10 ' involute by two semicircular ring, the thickness of first annulus is 20mm, the thickness of second annulus is 18mm, two sealings vitriol chambers 10 and 10 ' inner chambers respectively put a GDB-52LD photomultiplier 7 and 7 ', two the sealing vitriol chamber 10 and 10 ' between a spacing is arranged, constitute and measure the darkroom, at the top of measuring the darkroom one removable top cover 1 is arranged, sphere photoconduction 5 places to be measured in the darkroom, its inner chamber has one by hanging down the cylindric sample bottle 3 that potash glass is made, fill scintillation solution 4 in the bottle 3, the inner chamber of sphere photoconduction 5 is provided with the cylindric spire cover 2 that covers of a band upper base of being made by low background metal material, the liquid level that covers the scintillation solution 4 in the lower ending opening edge of spire cover 2 and the sample bottle 3 is on same surface level, the external diameter of its internal diameter and sample bottle 3 matches, because of the size of sample bottle 3 is decided by known standard with the amount of the bottle 3 interior scintillation solutions of being contained 4, so scintillation solution 4 liquid levels in the sample bottle 3 are known, can design the height and the internal diameter size of covering spire cover 2 thus, sample bottle 3 sizes are different with the amount of the bottle 3 interior scintillation solutions of being contained 4, and the height and the internal diameter size of covering spire cover 2 are also inequality.In the present embodiment, adopting the external diameter of sample bottle 3 is 26～28mm, highly be 58.5～63.0mm, the liquid level of scintillation solution 4 is 35mm in the bottle 3, the internal diameter that covers spire cover 2 is 29 ± 0.2mm, highly is 30mm, and material therefor can be copper, lead, aluminium, steel or stainless steel, cover spire cover 2 and be the nature true qualities, do not annotate black.Sample bottle 3 is delivered to by the sample presentation passage and is measured the bottom, darkroom, enter by hydraucone 13 and measure the darkroom, by lifting push rod 6 jackings of band spring 9 through covering the inner chamber that sphere photoconduction 5 is gone in optical shutter 8 holders.Sample bottle 3 bottoms are provided with a polishing mirror 11, and polishing mirror 11 bottom pads one felt pan piece 12 is supported on the top of lifting push rod 6.When sample bottle 3 entered the inner chamber of sphere photoconduction 5, its upper end was inserted in and is covered spire cover 2.The upper base inboard of covering spire cover 2 is provided with the high annulus boss of a 6mm, and its effect is the light leak that blocks removable top cover 1 edge, the top of withstanding sample bottle 3 simultaneously, when withdrawing from sample bottle 3 with cover spire cover 2 mutual stuck situation do not take place.After sample bottle 3 withdraws from the measurement darkroom, cover spire cover 2 and fall voluntarily, drop on the hole, lower edge of sphere photoconduction 5, and shelter from the printing opacity that covers optical shutter 8.
The utility model is because setting up an opacus overhead guard of metal, and it both can avoid the mutual optical crosstalk of two photomultipliers, improved the naturally radioactive background of instrument, again the detection efficient of lowering apparatus not. Experiment showed, that meeting type liquid for same dodges detector, when not having opacus overhead guard, its background count is 50～60cpm, after setting up the opacus overhead guard of metal, its background count is reduced to about 30cpm, and its effect is suitable with 7cm lead or 10cm iron shield effect when not adding opacus overhead guard. So just greatly alleviate the shielding material of instrument, that is the weight of instrument complete machine. This detector measurement repeatability error is less than 3%.
Claims (1)
1, a kind of improved type liquid scintillator detector that meets, comprise the sealing vitriol chamber 10 and 10 ', removable top cover 1, photomultiplier 7 and 7 ', sphere photoconduction 5, the sample bottle 3 of scintillation solution 4 is housed, polishing mirror 11, cushion block 12, the lifting push rod 6 that has spring 9, cover optical shutter 8 and hydraucone 13, the inner chamber that it is characterized in that sphere photoconduction 5 is provided with the cylindric spire cover 2 that covers of a band upper base of being made by low background metal material, the liquid level that covers the scintillation solution 4 in the lower ending opening edge of spire cover 2 and the sample bottle 3 is on same surface level, the external diameter of its internal diameter and sample bottle 3 matches, and its upper base inboard is provided with an annulus boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89219632 CN2056758U (en) | 1989-11-16 | 1989-11-16 | Improved compound liquid flash detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89219632 CN2056758U (en) | 1989-11-16 | 1989-11-16 | Improved compound liquid flash detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2056758U true CN2056758U (en) | 1990-05-02 |
Family
ID=4874461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89219632 Withdrawn CN2056758U (en) | 1989-11-16 | 1989-11-16 | Improved compound liquid flash detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2056758U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006094431A1 (en) * | 2005-03-08 | 2006-09-14 | Beijing Yuande Bio-Medical Engineering Co., Ltd. | Shade hood, test head assembly and test apparatus including the same |
| US7388666B2 (en) | 2005-03-08 | 2008-06-17 | Beijing Yuande Bio-Medical Engineering Co., Ltd. | Probe assembly with a light hood and a detecting instrument equipped with the same |
| CN101251601B (en) * | 2008-04-07 | 2010-09-15 | 西北核技术研究所 | Dispersion type scintillation detector for impulse gamma detection |
| CN105793713A (en) * | 2013-10-09 | 2016-07-20 | 株式会社日立制作所 | Sample measuring device |
-
1989
- 1989-11-16 CN CN 89219632 patent/CN2056758U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006094431A1 (en) * | 2005-03-08 | 2006-09-14 | Beijing Yuande Bio-Medical Engineering Co., Ltd. | Shade hood, test head assembly and test apparatus including the same |
| US7388666B2 (en) | 2005-03-08 | 2008-06-17 | Beijing Yuande Bio-Medical Engineering Co., Ltd. | Probe assembly with a light hood and a detecting instrument equipped with the same |
| CN100501371C (en) * | 2005-03-08 | 2009-06-17 | 北京源德生物医学工程有限公司 | Sunshade, test head assembly and tester containing the assembly |
| CN101251601B (en) * | 2008-04-07 | 2010-09-15 | 西北核技术研究所 | Dispersion type scintillation detector for impulse gamma detection |
| CN105793713A (en) * | 2013-10-09 | 2016-07-20 | 株式会社日立制作所 | Sample measuring device |
| US9791577B2 (en) | 2013-10-09 | 2017-10-17 | Hitachi, Ltd. | Sample measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |