CN2544279Y - Gamma ray detector - Google Patents
Gamma ray detector Download PDFInfo
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- CN2544279Y CN2544279Y CN 02224728 CN02224728U CN2544279Y CN 2544279 Y CN2544279 Y CN 2544279Y CN 02224728 CN02224728 CN 02224728 CN 02224728 U CN02224728 U CN 02224728U CN 2544279 Y CN2544279 Y CN 2544279Y
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- detector
- radioactive source
- gamma
- coal
- measurement device
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Abstract
The utility model relates to a fast measuring device for ash content of coal, in particular to a measuring device for a gamma ray, comprising a radioactive source and a detector. The utility model is characterized in that the radioactive source, the detector and a coal sampling container are fixed inside a framework body; the radioactive source and the detector are fixed at one side of the coal sampling container. The distance between the radioactive source and the detector is 200 plus or minus10mm; the middle point of the shortest line between the radioactive source and the detector is 170 plus or minus10mm away from a detected object. The energy of the gamma ray generated from the radioactive source is more than 1.022Mev. The detector is a sodium iodide detector with a diameter of 76mm; depleted uranium is adopted to shield and isolate between the detector and the radioactive source. The measuring device for the gamma ray can reduce elemental composition of the ash content in the coal and influence of density fluctuation on an ash content measuring result of a coal sample so as to improve the measuring precision.
Description
Affiliated field: the utility model relates to a kind of device of quick measurement ash content of coal, particularly a kind of gamma-ray measurement device.
Background technology: the device of at present known quick measurement ash content of coal, its radioactive source, coal sample, detector are penetrating type on same straight line.The energy of that radioactive source produces is lower than 1.022Mev, gamma-rays after the just transmission decay that detector is received, this energy intensity except with ash content of coal content mutually outside the Pass, and be subjected to that element composition and coal sample density influence bigger in the ash content, when coal changed greatly, measuring error was big.
Summary of the invention: the purpose of this utility model provides a kind of gamma-ray measurement device, it can reduce that ash element in the coal is formed and the coal sample density fluctuation to the influence of coal sample ash content measurement result, the raising measuring accuracy.
The purpose of this utility model is to realize like this, design a kind of gamma-ray measurement device, it comprises radioactive source and detector, it is characterized in that: at the frame body internal fixation radioactive source, detector, coal sample container are arranged, radioactive source and detector are fixed on the same side of coal sample container.
Described radioactive source and detector are at a distance of 200 ± 10 millimeters.
Described radioactive source and detector the mid point of short line apart from the distance of surveying thing at 170 ± 10 millimeters.
The energy of that described radioactive source produces is greater than 1.022Mev.
Described detector is 76 millimeters sodium iodide types of diameter detector.
Isolate with depleted uranium shielding in the middle of described detector and the radioactive source.
Characteristics of the present utility model are: the source of penetrating produce greater than after 1.022Mev gamma-rays and the coal sample effect, form quality annihilation feature 0.511Mev gamma-rays and backscattering gamma-rays.Feature 0.511Mev gamma intensity is relevant with ash content of coal content, and it is less to be subjected in the ash content element to form variable effect.The backscattering gamma intensity is relevant with coal sample density, utilizes this relation can proofread and correct the influence of coal sample density to measurement result.The thickness of coal sample is 300 millimeters, no longer produce greater than 300 millimeters backscattering and the matter ray that falls into oblivion, the part coal sample that has more survey less than; Survey total numeration less than 300 millimeters losses, reduce measuring accuracy.Test findings shows 300 ± 10 millimeters, and the pulse numeration is maximum.Use oil-poor isolation between detector and radioactive source, prevent radioactive source ray directly enter detector, the interference detection effect guarantees this device backscattering fixed geometirc structure simultaneously.The opening angle of radioactive source is radiation-curable to whole coal sample.This sample closest approach is 170 ± 10 millimeters apart from the surface distance of radiation detector, radiation source window surface.It is that the range finder side is 200 ± 10 millimeters that radioactive source is opened.Detector is easy to differentiate such geometry to guarantee the backscattering energy to be lower than 0.270Mev, makes tale the best of detection simultaneously.
Because radioactive source and detector are fixed on the same side of coal sample container, have adopted the backscattering structure, and adjust its geometric relationship, the ash content of coal measuring accuracy is significantly improved to best.The comparison test findings shows that its uncertainty of measurement is half of known penetrating type.
Below in conjunction with the embodiment accompanying drawing the utility model is described further:
Among the figure, 1, radioactive source; 2, coal sample container; 3, detector; 4, lead shield body; 5, shielding material; 6, lead shield body 7, Plumbum absorption plate 8, radioactive source opening and closing device; 9, frame body.
As shown in Figure 1, frame body 9 internal fixation have radioactive source 1, detector 3, coal sample container 2, and radioactive source 1 and detector 3 are fixed on the same side of coal sample container 2.
Radioactive source 1 is installed in by in the lead shield body 4, can pass through radioactive source opening and closing device 8 electric opening and closings, the general 7.4GBqCo60 of employing produces the 1.33Mev gamma-rays, this radiation exposure is on coal sample container 2, coal sample container 2 uses aluminium material, diameter d 3 is at 300 ± 10 millimeters, produce 0.511Mev feature gamma-rays after ray and the coal sample effect and be lower than 0.27Mev backscattering gamma-rays, NaI (T1) detector 3 is realized gamma-ray opto-electronic conversion, NaI (T1) detector 3 places in the lead shield body 6, Plumbum absorption plate 7 is arranged on lead shield body 6, and detector 3 indicates the pulse numeration of these two kinds of energy intensities through the multi-channel analysis record.Realize the measurement of coal ash part by the ash content of statistics scale coal sample and the correlationship of measurement result.
Have shielding material 5 that it is separated between radioactive source 1 and the detector 3, radioactive source 1 and detector 3 apart from d1 at 200 ± 10 millimeters.The middle distance of radioactive source 1 and detector 3 lines apart from coal sample container 2 apart from d2 at 170 ± 10 millimeters.
Claims (6)
1, gamma-ray measurement device, it comprises radioactive source and detector, it is characterized in that: at the frame body internal fixation radioactive source, detector, coal sample container are arranged, radioactive source and detector are fixed on the same side of coal sample container.
2, gamma-ray measurement device according to claim 1 is characterized in that: described radioactive source and detector are at a distance of 200 ± 10 millimeters.
3, gamma-ray measurement device according to claim 1 is characterized in that: described radioactive source and detector the mid point of short line apart from the distance of surveying thing at 170 ± 10 millimeters.
4, gamma-ray measurement device according to claim 1 is characterized in that: the energy of that described radioactive source produces is greater than 1.022Mev.
5, gamma-ray measurement device according to claim 1 is characterized in that: described detector is 76 millimeters sodium iodide types of diameter detector.
6, gamma-ray measurement device according to claim 1 is characterized in that: isolate with depleted uranium shielding in the middle of described detector and the radioactive source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224728 CN2544279Y (en) | 2002-04-05 | 2002-04-05 | Gamma ray detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224728 CN2544279Y (en) | 2002-04-05 | 2002-04-05 | Gamma ray detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2544279Y true CN2544279Y (en) | 2003-04-09 |
Family
ID=33702081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02224728 Expired - Fee Related CN2544279Y (en) | 2002-04-05 | 2002-04-05 | Gamma ray detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2544279Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551460B (en) * | 2009-05-13 | 2011-10-26 | 北京市煤炭矿用机电设备技术开发公司 | Explosion proof gamma-ray detector and mining coal ash analyzer |
-
2002
- 2002-04-05 CN CN 02224728 patent/CN2544279Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551460B (en) * | 2009-05-13 | 2011-10-26 | 北京市煤炭矿用机电设备技术开发公司 | Explosion proof gamma-ray detector and mining coal ash analyzer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |