CN108535766A - A kind of lamination flicker type anti-Compton gamma ray spectrometer - Google Patents
A kind of lamination flicker type anti-Compton gamma ray spectrometer Download PDFInfo
- Publication number
- CN108535766A CN108535766A CN201710129801.1A CN201710129801A CN108535766A CN 108535766 A CN108535766 A CN 108535766A CN 201710129801 A CN201710129801 A CN 201710129801A CN 108535766 A CN108535766 A CN 108535766A
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- China
- Prior art keywords
- lamination
- gamma ray
- type anti
- ray spectrometer
- compton
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/202—Measuring radiation intensity with scintillation detectors the detector being a crystal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section
Abstract
The invention belongs to radiation detection technology fields, are related to a kind of lamination flicker type anti-Compton gamma ray spectrometer.The lamination flicker type anti-Compton gamma ray spectrometer includes probe, and the probe includes CeBr3Scintillation crystal, BGO scintillation crystals, photomultiplier and charge sensitive preamplifier and they hermetically sealed shell, the CeBr3Scintillation crystal is for measuring gamma spectrum, and in addition to the exterior portion contacted with the shell, other exterior portions are coated by BGO scintillation crystals；The BGO scintillation crystals connection photomultiplier and charge sensitive preamplifier, for measuring in CeBr3The scintillation photons generated when Compton effect occurs in scintillation crystal.Utilize the lamination flicker type anti-Compton gamma ray spectrometer of the present invention, influence of the Compton effect to measurement can be just excluded merely with an instrument, and coincident circuit can be saved, lowering apparatus complexity and cost, to keep measuring system simpler, increase instrument property easy to carry and using flexible.
Description
Technical field
The invention belongs to radiation detection technology fields, are related to a kind of lamination flicker type anti-Compton gamma ray spectrometer.
Background technology
In the application scenarios such as the monitoring of nuclear power station liquid effluent and radwaste analysis, need to carry out gamma spectrum survey
Amount.In gamma spectrum measurement process, in detector sensitive volume Compton effect can occur for some photons, to increase in power spectrum
The background in full energy peak region increases the detection limit of measurement.By anti-Compton technology, it can identify that Kang Pu occurs in those
The event for effect of pausing, and they are rejected from γ spectrums, to reduce background, reduce detection limit.
Traditional anti-Compton spectrometer is to realize that main detector is for measuring gamma spectrum by two independent detectors.When
After in main detector Compton effect occurs for gamma-rays, scattered photon is captured by second detector.It is needed in this design
The signal of two detectors is measured respectively, and by additional coincident circuit, a time width is set, if two detectors are defeated
Go out the time of signal within the scope of the time width, then it is assumed that the two signals are caused by the same photon.It is this traditional
Design method needs two spectrometers, needs additional coincident circuit, increases equipment complexity and cost.
Invention content
The object of the present invention is to provide a kind of lamination flicker type anti-Compton gamma ray spectrometers, just to be excluded merely with an instrument
Influence of the Compton effect to measurement, and coincident circuit is saved, lowering apparatus complexity and cost.
In order to achieve this, in the embodiment on basis, the present invention provides a kind of lamination flicker type anti-Compton γ spectrums
Instrument, the lamination flicker type anti-Compton gamma ray spectrometer include probe, and the probe includes CeBr3Scintillation crystal, BGO are brilliant
Body scintillator, photomultiplier and charge sensitive preamplifier and they hermetically sealed shell,
The CeBr3Scintillation crystal is for measuring gamma spectrum, in addition to the exterior portion contacted with the shell,
Other exterior portions are coated by BGO scintillation crystals；
The BGO scintillation crystals connection photomultiplier and charge sensitive preamplifier, for measuring
In CeBr3The scintillation photons generated when Compton effect occurs in scintillation crystal；
The photomultiplier and charge sensitive preamplifier is used for gamma-rays in CeBr3It is produced in scintillation crystal
Raw scintillation photons are converted to voltage signal and are transferred to follow-up further signal processing system.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
The probe stated further includes the power connection connected with charge sensitive preamplifier with the photomultiplier and signal output
Interface, the power connection and signal output interface are pierced by the shell.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
The CeBr stated3Scintillation crystal is cylinder type, and an end face is contacted with the shell, another end face and side are described
BGO scintillation crystals cladding.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
The CeBr stated3The size of scintillation crystal is φ (25.4-76.2) x (25.4-76.2) mm.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
The BGO scintillation crystals stated are the cylindrical that inside is cut away a cylinder, in the cylinder that inside is cut away described in filling
CeBr3Scintillation crystal.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
The appearance and size for the BGO scintillation crystals stated is φ (30-90) x (30-90) mm.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
A diameter of 25-76mm of the photocathode sensitive volume of the photomultiplier and charge sensitive preamplifier stated.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein
The CeBr3It is coated with optical coupled dose on the contact surface of scintillation crystal and the BGO scintillation crystals.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein
It is coated with optics coupling on the BGO scintillation crystals and the contact surface of the photomultiplier and charge sensitive preamplifier
Mixture.
In a preferred embodiment, the present invention provides a kind of lamination flicker type anti-Compton gamma ray spectrometer, wherein institute
Optical coupled dose stated is silica gel, silicone grease or glycerine.
The beneficial effects of the present invention are using the lamination flicker type anti-Compton gamma ray spectrometer of the present invention, using difference
The difference of scintillator decay of luminescence constant just excludes influence of the Compton effect to measurement merely with an instrument, and can be because visiting
It surveys device signal and coincident circuit is only saved by a PMT outputs, lowering apparatus complexity and cost, to make measuring system more
Simply, increase instrument property easy to carry and using flexible.
Description of the drawings
Fig. 1 is the structure chart of the probe of the lamination flicker type anti-Compton gamma ray spectrometer of the illustrative present invention.
Fig. 2 is that three kinds of situation schematic diagrams of energy deposition occur in sensitive volume.
Fig. 3 is the signal amplitude and rise time Joint Distribution schematic diagram that three classes event generates.
Specific implementation mode
The specific implementation mode of the present invention is further illustrated below in conjunction with attached drawing.
One, sonde configuration
The lamination flicker type anti-Compton gamma ray spectrometer of the illustrative present invention includes probe, structure such as Fig. 1 institutes of the probe
Show, including CeBr3Scintillation crystal 1, BGO scintillation crystals 2, photomultiplier (PMT) and charge sensitive preamplifier 3,
And they hermetically sealed aluminum shell 6.
CeBr3Scintillation crystal 1 is cylinder type for measuring gamma spectrum, and size is φ 25.4mm x 25.4mm；Its
One end face is contacted with shell, another end face is coated with side by BGO scintillation crystals 2.
BGO crystal flickers 2 bodies connection photomultiplier and charge sensitive preamplifier 3, for measuring in CeBr3Crystal
The scintillation photons generated when Compton effect occurs in scintillator 1 are cut away cylindrical (i.e. Malin's cup of a cylinder for inside
Type), appearance and size is φ 50mm x 32mm；Its dress in the cylinder (size is φ 25.4mm x 25.4mm) that inside is cut away
Fill out CeBr3 scintillation crystals 1.
Photomultiplier and charge sensitive preamplifier 3 connect power connection 4 and the (power connection 4 of signal output interface 5
It is pierced by aluminum shell 6 with signal output interface 5), it is used for gamma-rays in CeBr3The scintillation photons generated in scintillation crystal 1 turn
It is changed to voltage signal and is transferred to follow-up further signal processing system, a diameter of 50mm of photocathode sensitive volume therein.
CeBr3The scintillation photons that scintillation crystal 1 and BGO scintillation crystals 2 generate enter in PMT and export electric signal.
CeBr3On the contact surface of scintillation crystal 1 and BGO scintillation crystals 2 and BGO scintillation crystals 2 and photoelectricity times
Increase and be coated with optical coupled dose (for silica gel, silicone grease or glycerine) on the contact surface of pipe and charge sensitive preamplifier 3, is dodged with increasing
The scintillation photons that bright body generates reach the probability of PMT photocathodes.
Aluminum shell 6 mainly plays a part of to protect internal material and be protected from light, and thickness is no less than 5mm.
Two, signal processing method
ADC of the voltage signal exported by sample rate more than 40MSPS that pop one's head in is acquired, and is transmitted in FPGA, is surveyed by FPGA
Measure amplitude and the rise time of signal.Wherein signal amplitude indicates that the voltage value that ADC is collected, rise time indicate signal
The time undergone from the 10%~90% of amplitude peak.
When incident γ particles are in detector sensitive volume generation energy deposition, three kinds of feelings as shown in Figure 2 can be divided into
Condition.
In Fig. 2, situation 1 indicates γ particles only in CeBr3Middle sedimentary energy is the event needed when measuring；Situation 2 indicates
γ particles are in CeBr3Middle generation Compton effect, scattered photon are detected by BGO, when this happens, are given up such
Event can realize the function of anti-Compton, to increase the peak Kombi for measuring power spectrum, reduce activity detection limit；Situation 3 indicates
Only the sedimentary energy in BGO should also give up this kind of event to particle since BGO energy resolutions are poor.
CeBr3Luminescence decay time constant be about 20ns, photon yield is about 60/keV, when the decay of luminescence of BGO
Between constant be about 300ns, photon yield is about 10/keV.The two parameter differences of two kinds of crystal are apparent, therefore three classes thing
The signal amplitude of part and the inevitable also significant difference of the distribution of rise time.
Fig. 3 is the signal amplitude and rise time Joint Distribution schematic diagram that three classes event generates, and in figure, 1 indicates the 1st class
(only in CeBr3Middle sedimentary energy) pulse event, 2 the 2nd classes of expression (Compton effect has occurred, it is all heavy in two kinds of scintillators
Product energy) pulse event, 3 indicate the 3rd class (the only sedimentary energy in BGO) pulse event.Obviously pass through signal amplitude and rising
Time, that is, this distinguishable three classes event.
Three, the specific making and measurement of lamination flicker type anti-Compton gamma ray spectrometer of the invention
1. manufacturing lamination flicker type anti-Compton gamma ray spectrometer by Fig. 1.
2. the ADC using sample rate more than 40MSPS adopts the voltage signal of ` collection detectors output, and is transmitted in FPGA,
By the amplitude h and rise time rt of FPGA measuring signals.Wherein signal amplitude indicates the numerical value that ADC is collected, rise time
Indicate the time that signal is undergone from the 10%~90% of amplitude peak.
3. being calculated according to following formula (1) and screening parameter
F=h/rt (1)
And it is determined by experiment and screens parameter threshold fT.If f>fT, then recording impulse；Otherwise give up the subpulse, the arteries and veins given up
Punching comprising have occurred Compton effect event and only in BGO sedimentary energy event.This step realizes anti-Compton work(
Energy.
4. pair meeting f>fTThe pulse of condition determines its energy calibration coefficient by experiment, and seeks pulse energy：
E=kh+E0 (2)
Wherein h and E0For energy calibration coefficient.
5. measure multiple pulse events, obtain by anti-Compton treated gamma spectrum.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.Above-described embodiment or embodiment are only to the present invention
For example, the present invention can also be implemented with other ad hoc fashions or other particular form, without departing from the present invention's
Main idea or substantive characteristics.Therefore, it is regarded as from the point of view of the embodiment of description is in terms of any illustrative and non-limiting.This
The range of invention should be illustrated that any variation equivalent with the intention and range of claim also should include by appended claims
Within the scope of the invention.
Claims (10)
1. a kind of lamination flicker type anti-Compton gamma ray spectrometer, which is characterized in that the lamination flicker type anti-Compton gamma ray spectrometer
Including probe, the probe includes CeBr3Scintillation crystal, BGO scintillation crystals, photomultiplier and charge-sensitive are preposition
Amplifier and they hermetically sealed shell,
The CeBr3Scintillation crystal is for measuring gamma spectrum, in addition to the exterior portion contacted with the shell, other
Exterior portion is coated by BGO scintillation crystals；
The BGO scintillation crystals connection photomultiplier and charge sensitive preamplifier, for measuring
CeBr3The scintillation photons generated when Compton effect occurs in scintillation crystal；
The photomultiplier and charge sensitive preamplifier is used for gamma-rays in CeBr3It is generated in scintillation crystal
Scintillation photons are converted to voltage signal and are transferred to follow-up further signal processing system.
2. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 1, it is characterised in that：The probe is also
Include the power connection and signal output interface connected with the photomultiplier with charge sensitive preamplifier, it is described
Power connection and signal output interface are pierced by the shell.
3. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 1, it is characterised in that：The CeBr3It is brilliant
Body scintillator is cylinder type, and an end face is contacted with the shell, another end face is dodged with side by the BGO crystal
Bright body cladding.
4. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 3, it is characterised in that：The CeBr3It is brilliant
The size of body scintillator is φ (25.4-76.2) x (25.4-76.2) mm.
5. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 3, it is characterised in that：The BGO is brilliant
Body scintillator is the cylindrical that inside is cut away a cylinder, and the CeBr is loaded in the cylinder that inside is cut away3Crystal
Scintillator.
6. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 5, it is characterised in that：The BGO is brilliant
The appearance and size of body scintillator is φ (30-90) x (30-90) mm.
7. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 1, it is characterised in that：The photoelectricity times
Increase a diameter of 25-76mm of the photocathode sensitive volume of pipe and charge sensitive preamplifier.
8. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 1, it is characterised in that：In the CeBr3
It is coated with optical coupled dose on the contact surface of scintillation crystal and the BGO scintillation crystals.
9. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 1, it is characterised in that：In the BGO
Optical coupled dose is coated on scintillation crystal and the contact surface of the photomultiplier and charge sensitive preamplifier.
10. a kind of lamination flicker type anti-Compton gamma ray spectrometer according to claim 8 or claim 9, it is characterised in that：The light
Couplant is silica gel, silicone grease or glycerine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710129801.1A CN108535766A (en) | 2017-03-06 | 2017-03-06 | A kind of lamination flicker type anti-Compton gamma ray spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710129801.1A CN108535766A (en) | 2017-03-06 | 2017-03-06 | A kind of lamination flicker type anti-Compton gamma ray spectrometer |
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| CN201710129801.1A Pending CN108535766A (en) | 2017-03-06 | 2017-03-06 | A kind of lamination flicker type anti-Compton gamma ray spectrometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111158040A (en) * | 2019-12-27 | 2020-05-15 | 中国原子能科学研究院 | Layout structure for improving compton inhibition factor of anti-well-being spectrometer |
| CN112946721A (en) * | 2021-01-22 | 2021-06-11 | 西安交通大学 | Detector capable of simultaneously identifying alpha, beta and gamma rays and detection method |
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| US7405404B1 (en) * | 2004-09-23 | 2008-07-29 | Radiation Monitoring Devices, Inc. | CeBr3 scintillator |
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| US7405404B1 (en) * | 2004-09-23 | 2008-07-29 | Radiation Monitoring Devices, Inc. | CeBr3 scintillator |
| US20080251728A1 (en) * | 2007-04-10 | 2008-10-16 | The Regents Of The University Of Ca | Isotopic response with small scintillator based gamma-ray spectrometers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111158040A (en) * | 2019-12-27 | 2020-05-15 | 中国原子能科学研究院 | Layout structure for improving compton inhibition factor of anti-well-being spectrometer |
| CN111158040B (en) * | 2019-12-27 | 2021-09-28 | 中国原子能科学研究院 | Layout structure for improving compton inhibition factor of anti-well-being spectrometer |
| CN112946721A (en) * | 2021-01-22 | 2021-06-11 | 西安交通大学 | Detector capable of simultaneously identifying alpha, beta and gamma rays and detection method |
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