CN86204889U - High-energy r ray source device for calibration - Google Patents
High-energy r ray source device for calibration Download PDFInfo
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- CN86204889U CN86204889U CN 86204889 CN86204889U CN86204889U CN 86204889 U CN86204889 U CN 86204889U CN 86204889 CN86204889 CN 86204889 CN 86204889 U CN86204889 U CN 86204889U CN 86204889 U CN86204889 U CN 86204889U
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Abstract
The utility model relates to a high energy r-rays calibration source device which utilizes radioactive neutron sources of Am-Be to generate a thermal neutron capture reaction on radiation samples of iron, nickle and magnesium dioxide through moderation to obtain monocolor r-rays with the energy of 5-10Mev. The monocolor r-rays are used for scaling energy linearity, energy resolution and relative efficiency of the r-rays detectors of Ge (Li), HPGe, NaI (Tl), etc.
Description
The utility model belongs to a kind of easy HIGH ENERGY GAMMA RAY SOURCE device that is used for the scale gamma ray detector.
Usually the energy of the monoenergetic gamma ray radiator of scale gamma ray detector all below 3MeV, the performance of the detector under the scale high-energy condition, and just need utilize the gamma ray projector that the method for nuclear reaction obtains being suitable on accelerator or reactor.But getable monochromatic energy of is very limited on accelerator; On reactor with thermal capture can produce various energy gamma-rays referring to " the energy height is to 11MeV reactor high strength apportion gamma ray projector " (The Nuclear Reactor as A High Intensity Source For Dis-crete Gamma Rays up to 11MeV) of Ya Lieseke (Jarizyk) etc., Nucl.Instr.and Meth.13(1961) 287 and " the monochromatic gamma ray projector device of high strength " " atomic nuclear physics " 6(1984 of Li Jingwen etc.) 15.But, bring very big difficulty to use, and seem very inconvenient because of depending on reactor because background is big on every side.
The utility model purpose is to disclose the monochromatic gamma ray projector device that a kind of easy radioactivity neutron source of using Am-Be and so on produces 5～10MeV energy range.
Utilizing Am-Be neutron source to produce gamma-ray ultimate principle is by neutron and nuclear (its energy is between 5～10MeV for n, γ) the monochromatic gamma-rays of reaction emission characteristic.Am-Be neutron source is by (the gamma-ray probability of emission high-energy is very little for a, the n) gamma-rays of the main emission in reaction back 4.43MeV.
241The gamma-ray energy of Am emission itself is all below 1MeV, so the gamma-rays of Am-Be neutron source emission itself does not influence the gamma-ray use more than the 5MeV.By (n, a) reaction also can obtain monochromatic gamma-rays, but intensity is little.Because the capture cross-section of thermal neutron is far longer than the neutron of other energy, if the neutron of Am-Be neutron source emission is passed through the paraffin slowing down, make thermal capture become main effect, select suitable radiator then, the monochromatic gamma-rays that then can obtain being suitable for.
Accompanying drawing 1 is a high-energy gamma ray calibration source device synoptic diagram.As seen from the figure, neutron source ［ 3 ］ places the center of device, selects the less neutron source of gamma-rays background for use, as Am-Be neutron source or Pu-Be neutron source.Neutron source ［ 3 ］ is radiator ［ 4 ］ on every side, radiator sample such as iron, nickel or magnesium dichloride, and they are captured thermal neutron and produce the feature gamma-rays.It between neutron source and the radiator slowing down layer ［ 1 ］.Radiator ［ 4 ］ go up to be placed paraffin or tygon as reflection horizon ［ 2 ］ with the top all around, is used for the reverberation neutron, and can reduce the background that neutron scattering causes.Being sidelong and putting a bismuth plate, with the low-yield gamma-rays of filtering as filtrator ［ 5 ］ near one of detector.［ 6 ］ are gamma ray detector among the figure.
Embodiment 1: neutron source ［ 3 ］ is Am-Be neutron source, and source strength is 10
5N/s, slowing down layer ［ 1 ］ are the thick paraffin of 1cm, and radiator ［ 4 ］ is the thick iron of 2cm, and reflection horizon ［ 2 ］ are the thick paraffin of 5cm, and filtrator ［ 5 ］ is the thick bismuth plate of 1cm.
For testing gamma-ray performance, use φ 45 * 45mm
3Coaxial Ge (Li) detector, it is right
60The gamma-ray energy resolution of the 1332keV of Co is 3.7keV.The wide 10keV of being about in the road of the multichannel analyzer that uses in the measurement uses 1173,1332(to resulting gamma-ray energy
60Co), 1461(is natural
40K) and 4430(Am-Be source itself) the γ source of keV carries out energy and broaches, and makes accurate energy value by nuclear energy level again.For reducing piling up of low-energy, at Ge(Li) outer mask of probe is the lead of 5mm and " cap " that the thick iron of 3mm is formed with thick, add the about 5mm of a bed thickness by boron carbide and epoxy resin mix and the solidifying body conduct that forms to the protection body of neutron.
Fig. 2 is the gamma ray spectrum that record obtained after 5 hours, and figure the right is three spectral lines of 7640keV, P among the figure, and S, D represent full energy peak respectively, escape peak and double escape peak.The left side of Fig. 2 is three rays of the 4.43MeV of Am-Be source emission itself, and their half width is about 80keV, and big like this width estimates to be mainly derived from the recoil effect of carbon nuclear emission neutron, and this gamma-ray intensity is about gamma-ray 20 times of 7640keV.Meanwhile, at the energy lower part, also have one to capture that neutron forms deuteron and the monoenergetic gamma rays of the 2223keV that launches by proton, this sees fully aware ofly in measurement, and its energy resolution is less than multiple channels wide (10keV).
With the known NaI(T1 of detection efficiency) total intensity of scintillation detector guestimate 7631 and these two rays of 7645KeV is 5 * 10
2Photons/second.
Embodiment 2: implementation condition is substantially the same manner as Example 1, and unique difference is to change the iron radiator into 8mm thick nickel plate.Fig. 3 measures the high energy part that obtained composing shape in 2 hours, and nickel is captured the gamma-rays that thermal neutron produces intensity maximum (8998keV) in the gamma-rays later on.It accounts for 40% of energetic gamma rays sum.Learn that according to interrelated data ［ Nucl.Data 3A(1967) 367 ］ number of whenever capturing 100 these rays of neutron is 26.7640keV is the background that causes of iron-bearing materials on every side among the figure.
Embodiment 3:Am-Be source neutron bombardment chlorine produces gamma-rays.Chlorine is captured the gamma-rays of thermal neutron emission, in the measurement of nuclear reaction gamma spectroscopy, is used as the standard of energy and intensity, and its gamma-ray energy is accurately measured, and measuring error is 0.2keV.
Use MgCl
2Crystalline powder is as radiator, and 1 kilogram of total amount is dressed up 6 small plastic bags and is trapped among around the Am-Be neutron source that is surrounded by the thick paraffin of 2cm MgCl
2The outside still is added with the thick paraffin layer of 5cm, in the one side by detector the thick bismuth filtrator of 1cm is arranged.Fig. 4 is the high energy part that writes down the gamma spectrum figure that obtained in 3 hours.As seen from the figure, in the gamma-rays that thermal neutron capture reaction produced of chlorine, intensity all shows greater than the energetic gamma rays of 2.75 γ/100n.They are respectively 8575.65keV(2.79), 7790.40keV(8.43), 7414.01keV(10.2), 6627.95keV(4.43), 6619.76keV(7.92), 6111.00keV(19.8), 5715.40keV(5.35), the gamma-rays number that 100 neutrons produce is whenever captured in numeric representation in the bracket.Magnesium is captured the gamma-rays that neutron produces, and its main energy is 3.92MeV.
In sum, utilizing neutron intensity is 10
5Samples such as the Am-Be of n/s or Pu-Be neutron source irradiation iron, nickel, magnesium dichloride obtain intensity 8998keV, 7638keV and 6111keV high-energy gamma ray that be suitable for, that monochromaticity is good, can be used as gamma ray detector such as Ge(Li), HPGe and NaI(T1) the scale of linearity, energy resolution and relative efficiency.Such cover scale source apparatus not only have the advantage that energy of monochromaticity is good, intensity is suitable for, energy is high, and device is simple, easy to use, does not rely on reactor.The utility model has also been opened up a kind of new purposes for radioactivity neutron source.
Claims (6)
1, a kind of high-energy gamma ray calibration source device, form by neutron source, slowing down layer, radiator, it is characterized in that utilizing radioactivity neutron source, is that thermal neutron and radiator cause that thermal capture produces monochromatic feature gamma-rays, is used for the scale gamma ray detector through slowing down layer slowing down.
2, high-energy gamma ray calibration source device according to claim 1 is characterized in that being equipped with reflection horizon and filtrator.
3, high-energy gamma ray calibration source device according to claim 1 and 2 is characterized in that radioactivity neutron source wherein is Am-Be neutron source or Pu-Be neutron source.
4, high-energy gamma ray calibration source device according to claim 1 and 2 is characterized in that moderation of neutrons material wherein is paraffin or tygon.
5, height energy gamma calibration source apparatus according to claim 1 and 2 is characterized in that radiative capture material wherein is iron, nickel or magnesium dichloride.
6, high-energy gamma ray calibration source device according to claim 1 and 2 is characterized in that reflection horizon wherein is paraffin or tygon, and filtrator is the bismuth plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86204889 CN86204889U (en) | 1986-07-04 | 1986-07-04 | High-energy r ray source device for calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86204889 CN86204889U (en) | 1986-07-04 | 1986-07-04 | High-energy r ray source device for calibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86204889U true CN86204889U (en) | 1987-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86204889 Ceased CN86204889U (en) | 1986-07-04 | 1986-07-04 | High-energy r ray source device for calibration |
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| CN (1) | CN86204889U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590252A (en) * | 2012-02-27 | 2012-07-18 | 长春工业大学 | Device for rapidly detecting iron content of iron ore by utilizing D-D neutron generator |
| CN103069500A (en) * | 2010-03-10 | 2013-04-24 | 南非核能有限公司 | Method of producing radionuclides |
| CN103605149A (en) * | 2013-11-26 | 2014-02-26 | 西北核技术研究所 | Device and method for detection efficiency calibration of xenon sample HPGe |
| CN104597481A (en) * | 2014-12-26 | 2015-05-06 | 北京放射性核素实验室 | Gas sample calibration standard source and preparation method thereof |
| CN105353400A (en) * | 2015-11-13 | 2016-02-24 | 中国计量科学研究院 | Inlaying source device used for scintillation crystal detector gain automatic control |
| CN109269538A (en) * | 2018-10-16 | 2019-01-25 | 中国海洋石油集团有限公司 | One kind is with brill neutron He3 pipe scale test device |
-
1986
- 1986-07-04 CN CN 86204889 patent/CN86204889U/en not_active Ceased
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103069500A (en) * | 2010-03-10 | 2013-04-24 | 南非核能有限公司 | Method of producing radionuclides |
| CN103069500B (en) * | 2010-03-10 | 2016-10-12 | 南非核能有限公司 | The method producing radionuclide |
| CN102590252A (en) * | 2012-02-27 | 2012-07-18 | 长春工业大学 | Device for rapidly detecting iron content of iron ore by utilizing D-D neutron generator |
| CN103605149A (en) * | 2013-11-26 | 2014-02-26 | 西北核技术研究所 | Device and method for detection efficiency calibration of xenon sample HPGe |
| CN103605149B (en) * | 2013-11-26 | 2015-11-25 | 西北核技术研究所 | A kind of device and method of scale xenon sample HPGe detection efficiency |
| CN104597481A (en) * | 2014-12-26 | 2015-05-06 | 北京放射性核素实验室 | Gas sample calibration standard source and preparation method thereof |
| CN105353400A (en) * | 2015-11-13 | 2016-02-24 | 中国计量科学研究院 | Inlaying source device used for scintillation crystal detector gain automatic control |
| CN109269538A (en) * | 2018-10-16 | 2019-01-25 | 中国海洋石油集团有限公司 | One kind is with brill neutron He3 pipe scale test device |
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