CN104730565A - Ultrafast gamma ray energy disperse spectroscopy - Google Patents
Ultrafast gamma ray energy disperse spectroscopy Download PDFInfo
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- CN104730565A CN104730565A CN201510102783.9A CN201510102783A CN104730565A CN 104730565 A CN104730565 A CN 104730565A CN 201510102783 A CN201510102783 A CN 201510102783A CN 104730565 A CN104730565 A CN 104730565A
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Abstract
An ultrafast gamma ray energy disperse spectroscopy comprises a scintillation crystal array, a light guide array, a detector array and an analyzer. The scintillation crystal array, the light guide array and the detector array are sequentially arranged in the incidence direction of gamma rays, and the output end of the detector array is connected with the input end of the analyzer. Each piece of scintillation crystal, a light guide device corresponding to the scintillation crystal and a detector corresponding to the scintillation crystal form an independent gamma ray detecting channel, and therefore the problem of crosstalk of photons in the detectors is avoided; the ultrafast gamma ray energy disperse spectroscopy is high in measurement accuracy, large in dynamic range, high in integration level and flexible to use, and the measuring range is changeable.
Description
Technical field
The present invention relates to the power spectrum detection of gamma ray, the particularly power spectrum detection instrument of the ultrafast gamma ray of high field Laser Driven.
Technical background
The relativistic electron beam that obtains and secondary laser pulse effect generation inverse Compton scattering are accelerated in laser tail field, or produce bremstrahlen with solid target effect, can obtain ultrafast gamma ray.At present, be usually used in high purity germanium detector and the scintillation detector of gamma spectrometry, due to the restriction of temporal resolution, cannot directly obtain ultrafast gamma ray spectroscopy.The power spectrum of ultrafast gamma ray is generally detected by indirectly mode.At present primarily of three kinds of modes: the energy deposition of different-thickness filter plate, spectroscopy for Compton scattering and light core Activation measurement.
First technology [1] is (see C.D.Chen, J.A.King, M.H.Key, et al.A Bremsstrahlung spectrometer using k-edge and differential filters with image plate dosimeters [J] .Review of Scientific Instruments, 2008,79 (10): 10E305) energy deposition of the filter plate of different-thickness is penetrated by record gamma light, anti-release gamma spectrum.This spectrometer forms by with lower component: the metal filter plate, collimator, magnetic deflection instrument, IP plate, lead shield room etc. of different materials and thickness.After magnetic deflection instrument separately, gamma ray is by inciding metal filter plate thereafter after plumbous collimator for the ultrafast gamma ray that high field Laser Driven produces and positron-electron.The corresponding cut-off energy of every one deck sheet metal, and place a slice IP plate after each sheet metal, the gamma-ray photon of record outgoing.Scan process is carried out to all IP plates, the spectral information of gamma ray can be obtained.This technology can record the gamma ray of MeV, but cannot accurately record higher energy range, and precision is by the restriction of sheet metal number, is about 100KeV.
First technology [2] is (see D.J.Corvan, G.Sarri, M.Zepf.Design of a compact spectrometer for high-flux MeV gamma-ray beams [J] .Review of Scientific Instruments, 2014,85 (6): 065119) according in Compton scattering, the electronics after scattering and incident light have similar spectral distribution; By measuring the anti-power spectrum pushing away gamma ray of electronic energy spectrum of scattering after ultrafast gamma ray and target effect.This spectrometer mainly comprises: magnetic deflection instrument, collimator, Li target, IP plate and screened room.Ultrafast gamma ray incides Li target, and the gamma ray of outgoing and positron-electron, by plumbous collimating aperture, filter the particle that scattering angle is larger; Thereafter by magnetic deflection instrument by three kinds of particles separately, use the positron-electron information of IP plate record outgoing simultaneously.Then by inverting, the power spectrum of ultrafast gamma light can be obtained.This mode can measure the power spectrum of 3-20MeV, and cannot measure the gamma light of more low-yield scope, and precision being lower, is 1MeV.
First technology [3] (W.Schumaker, G.Sarri, M.Vargas, et al.Measurements of high-energy radiation generation from laser-wakefield accelerated electron beams [J] .Physics of Plasmas, 2014,21 (5): 056704) power spectrum of gamma light is obtained by light core Activation measurement.This spectrometer mainly comprises: activation target, scintillation detector and screened room etc.Ultrafast gamma light incides on activation target, the photon that energy is higher can overcome neutron in atomic nucleus in conjunction with energy, thus discharge a neutron, namely (γ, n) reaction occur.After discharging a neutron, there is β+decay in remaining rich proton nuclei, launches a positron.This positron and neighbouring electronics are buried in oblivion rapidly, thus discharge the photon of two reverse 511KeV, and the photon number of release can be recorded by scintillation detector.The energy that this technology can be used for measuring is greater than the gamma light of 10MeV, cannot measure more low-energy gamma spectrum, and low precision, is greater than 1MeV.
Summary of the invention
The object of the invention is to overcome the deficiency in first technology, propose a kind of ultrafast gamma-ray spectrometer, realize the precision measurement of ultrafast gamma ray spectroscopy, and range is large, integrated degree is high, uses flexibly.
Technical solution of the present invention is as follows:
A kind of ultrafast gamma-ray spectrometer, its feature is, comprises scintillation crystal array, optical fiber array, detector array and analyzer;
The position relationship of above-mentioned each parts is: along the incident direction of gamma ray, and described scintillation crystal array, optical fiber array and the detector array placed successively, the output terminal of this detector array is connected with the input end of described analyzer.
Described scintillation crystal array is made up of along two-dimension periodic arrangement multiple scintillation crystal, optical fiber array arrange along two-dimension periodic by many photoconductions identical with scintillation crystal and is formed, and described detector array to be arranged along the two-dimensional space cycle by the detector more than identical with scintillation crystal and formed.
The line number m that described scintillation crystal array, described optical fiber array and described detector array are listed in two-dimensional directional is all identical with columns n, and m × n >=900.
The receiving end of described scintillation crystal is towards gamma-ray source, and exit end is towards described optical fiber array, and the area of described exit end is less than or equal to the area of described receiving end.
The sidewall of described scintillation crystal is coated with high-reflecting film.
The line at the center of photoconduction that the center of described scintillation crystal is corresponding with it and the center of corresponding detector thereof perpendicular to the surface of this detector, the incident direction of described ultrafast gamma ray and this line coincident.
Described scintillation crystal array is made up of along the arrangement of two-dimensional directional cycle scintillation crystal, scintillation crystal can convert gamma ray to visible ray, one of alternate material is for mixing the yag crystal (YAG (Ce)) of cerium, and its sidewall is coated with high-reflecting film.The version of scintillation crystal can be the one in cylinder, rectangular parallelepiped, round platform, but be not limited only to this, it is receiving end near a section of gamma-ray source, is exit end near one end of optical fiber array, at all events plant version, the sectional area of exit end is not more than the sectional area of receiving end.
Described optical fiber array is made up of several photoconductions, the photoconduction of scintillation crystal outgoing can be caused on described detector array, to detect.
Described detector array is made up of along the arrangement of two-dimensional space cycle detector, and detector can convert visible ray to electric signal.
Be electrically connected between described analyzer and described detector array.
The line number m that described scintillation crystal array, described optical fiber array and described detector array are listed in two-dimensional space is all identical with columns n, m × n >=900.Scintillation crystal is along the center of the photoconduction receiving end of the axis of symmetry process correspondence of gamma ray incident direction, and the center of photoconduction exit end and the line at the center of corresponding detector are perpendicular to corresponding detector surface.
With compared with first technology, technique effect of the present invention is as follows:
1. the photoconduction that every root scintillation crystal is corresponding with it and detector form separately the detection channels of independently gamma ray, and each passage is separate, avoids the problem of photon crosstalk in detector.
2. Measurement channel is many, is no less than 900, so detection accuracy is high, is less than 100KeV.
3. dynamic range is large, and range is variable.The present invention can the more accurate ultrafast gamma ray measured in 100KeV-10MeV energy range.Because the highest detectable power spectrum is relevant with crystal length, change range by changing crystal length.
4. integrated level is high, uses flexibly.Without the need to external equipment, directly obtained the power spectrum of surveyed ultrafast gamma ray by instrument.Can meet different application demands by customization light-guiding system, the dirigibility of detection is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the ultrafast gamma-ray spectrometer of the present invention.
Fig. 2 is several versions of scintillation crystal.
Fig. 3 is single channel detection schematic diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the structural representation of the ultrafast gamma-ray spectrometer of the present invention, and as seen from the figure, a kind of ultrafast gamma-ray spectrometer comprises scintillation crystal array 1, optical fiber array 2, detector array 3, analyzer 4.Its position relationship is: along the incident direction of gamma ray, through described scintillation crystal array 1, is then incident on described detector array 3 through described optical fiber array 2, is electrically connected between described detector array 3 and described analyzer 4.Described scintillation crystal array 1 converts gamma ray to visible ray, described optical fiber array 2 plays a part to guide light, described detector array 3 converts visible ray to electric signal, and described analyzer 4 processes rear output spectrum information to the electric signal received.
Described scintillation crystal array 1 is made up of along two-dimension periodic arrangement scintillation crystal 11, and the receiving end 111 of scintillation crystal 11 is near gamma-ray source, and the exit end 112 of scintillation crystal 11 is near described optical fiber array 2.The area of exit end 112 is not more than the area of receiving end 111.The sidewall 113 of scintillation crystal 11 is coated with high-reflecting film.
Described optical fiber array 2 is made up of several photoconductions 21, plays guide lights, can customize according to different application demands.
Described detector array 3 is made up of along the arrangement of two-dimensional space cycle detector 31.
Described scintillation crystal array 1, described optical fiber array 2 are all identical with columns n at the line number m of two-dimensional directional with described detector array 3, and m × n >=900.
Along the receiving end 111 of gamma ray incident direction, scintillation crystal 11 and the exit end 112 of scintillation crystal 11, the line of the center C211 of photoconduction 21 receiving end corresponding with it, photoconduction exit end center C212 and the center C31 of corresponding detector 31 is perpendicular to the surface of corresponding detector 31.
The ultrafast gamma-ray spectrometer of the present invention more accurately can measure the ultrashort gamma ray in 100KeV-10MeV energy range.For being no less than 900 separate single channel compositions, avoid the problem of photon crosstalk in detector, measuring accuracy is high, is less than 100KeV.
Fig. 2 is three kinds of versions of scintillation crystal 11.List three kinds of structures in figure: round platform, cylinder, rectangular parallelepiped, these three kinds of structures are the possible version of scintillation crystal, but should not limit the structure of scintillation crystal with this.
Fig. 3 is single channel detection schematic diagram.Gamma ray S1 converts visible ray S2 to after scintillation crystal 11, and light S2 becomes light S3 after photoconduction 21, and light S3 is incident on detector 31 and converts electric signal to, so far completes the conversion of gamma ray to electric signal.Scintillation crystal 11 is longer, and detectable most high energy spectrum is also larger, so can change range by the length changing scintillation crystal 11.
Claims (6)
1. a ultrafast gamma-ray spectrometer, is characterized in that, comprises scintillation crystal array (1), optical fiber array (2), detector array (3) and analyzer (4);
The position relationship of above-mentioned each parts is: along the incident direction of gamma ray, described scintillation crystal array (1), optical fiber array (2) and the detector array (3) placed successively, the output terminal of this detector array (3) is connected with the input end of described analyzer (4).
2. ultrafast gamma-ray spectrometer according to claim 1, it is characterized in that, described scintillation crystal array (1) is made up of along two-dimension periodic arrangement multiple scintillation crystal (11), optical fiber array (2) arrange along two-dimension periodic by many photoconductions (21) identical with scintillation crystal (11) and is formed, and described detector array (3) to be arranged along the two-dimensional space cycle by the detector (31) more than identical with scintillation crystal (11) and formed.
3. ultrafast gamma-ray spectrometer according to claim 1 and 2, it is characterized in that, described scintillation crystal array (1), described optical fiber array (2) are all identical with columns n at the line number m of two-dimensional directional with described detector array (3), and m × n >=900.
4. ultrafast gamma-ray spectrometer according to claim 2, it is characterized in that, the receiving end (111) of described scintillation crystal (11) is towards gamma-ray source, exit end (112) is towards described optical fiber array (2), and the area of described exit end (112) is less than or equal to the area of described receiving end (111).
5. ultrafast gamma-ray spectrometer according to claim 2, is characterized in that, the sidewall (113) of described scintillation crystal (11) is coated with high-reflecting film.
6. ultrafast gamma-ray spectrometer according to claim 2, it is characterized in that, the line at the center of photoconduction that the center of described scintillation crystal is corresponding with it and the center of corresponding detector thereof perpendicular to the surface of this detector, the incident direction of described ultrafast gamma ray and this line coincident.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950587A (en) * | 2017-05-17 | 2017-07-14 | 孙红岩 | A kind of scintillation crystal detectors with effective light guide |
| CN107728193A (en) * | 2017-10-10 | 2018-02-23 | 成都理工大学 | A kind of gamma spectrometer |
| WO2019090831A1 (en) * | 2017-11-09 | 2019-05-16 | 苏州瑞派宁科技有限公司 | Light guide and nuclear detector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03140890A (en) * | 1989-10-19 | 1991-06-14 | Hughes Aircraft Co | Gamma-ray detector using crystal waveguide |
| CN1204403A (en) * | 1995-10-31 | 1999-01-06 | 比奥特雷斯公司 | Ultralow background multiple photon detector |
| CN102288983A (en) * | 2011-05-19 | 2011-12-21 | 中国工程物理研究院激光聚变研究中心 | Gamma ray imaging spectrometer |
| CN102798883A (en) * | 2012-09-11 | 2012-11-28 | 西北核技术研究所 | Pulse X/gamma ray energy spectrum measurement device based on optical fiber array |
| CN103217702A (en) * | 2013-04-16 | 2013-07-24 | 山东省科学院海洋仪器仪表研究所 | Low background gamma energy dispersive spectrometer for ocean radioactive measurement |
| CN104391316A (en) * | 2014-12-08 | 2015-03-04 | 上海太弘威视安防设备有限公司 | Three-dimensional space curved face multi-energy scintillation detector |
-
2015
- 2015-03-10 CN CN201510102783.9A patent/CN104730565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03140890A (en) * | 1989-10-19 | 1991-06-14 | Hughes Aircraft Co | Gamma-ray detector using crystal waveguide |
| CN1204403A (en) * | 1995-10-31 | 1999-01-06 | 比奥特雷斯公司 | Ultralow background multiple photon detector |
| CN102288983A (en) * | 2011-05-19 | 2011-12-21 | 中国工程物理研究院激光聚变研究中心 | Gamma ray imaging spectrometer |
| CN102798883A (en) * | 2012-09-11 | 2012-11-28 | 西北核技术研究所 | Pulse X/gamma ray energy spectrum measurement device based on optical fiber array |
| CN103217702A (en) * | 2013-04-16 | 2013-07-24 | 山东省科学院海洋仪器仪表研究所 | Low background gamma energy dispersive spectrometer for ocean radioactive measurement |
| CN104391316A (en) * | 2014-12-08 | 2015-03-04 | 上海太弘威视安防设备有限公司 | Three-dimensional space curved face multi-energy scintillation detector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950587A (en) * | 2017-05-17 | 2017-07-14 | 孙红岩 | A kind of scintillation crystal detectors with effective light guide |
| CN107728193A (en) * | 2017-10-10 | 2018-02-23 | 成都理工大学 | A kind of gamma spectrometer |
| WO2019090831A1 (en) * | 2017-11-09 | 2019-05-16 | 苏州瑞派宁科技有限公司 | Light guide and nuclear detector |
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Application publication date: 20150624 |