CN107219548A - A kind of portable anti-Compton survey meter - Google Patents
A kind of portable anti-Compton survey meter Download PDFInfo
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- CN107219548A CN107219548A CN201710641911.6A CN201710641911A CN107219548A CN 107219548 A CN107219548 A CN 107219548A CN 201710641911 A CN201710641911 A CN 201710641911A CN 107219548 A CN107219548 A CN 107219548A
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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
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/361—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with a combination of detectors of different types, e.g. anti-Compton spectrometers
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
The present invention relates to ore deposit field of detecting.Purpose is to provide a kind of portable anti-Compton survey meter, including top electronics element cell and bottom probe chamber.Handle is housed at the top of the top electronics element cell, the bottom probe chamber enclosed inside has main detector, the main detector lower end is designed with window, and main detector periphery sets multiple anticoincidence detectors, and multiple anticoincidence detector outer layers are designed with screen layer.The main detector includes scintillation crystal, optical coupling material, photodiode, pre-amplification circuit and bias power supply circuit with anticoincidence detector, the electronics element cell includes each unit circuit and battery, and the element circuit includes summing circuit and the multi-channel analysis circuit with anticoincidence circuit.The anti-Compton survey meter of the present invention has simple in construction, cost low and light portative advantage.
Description
Technical field
The present invention relates to ore deposit field of detecting, a kind of portable anti-Compton survey meter is particularly related to.
Background technology
Today with fossil resource shortage is increasingly highlighted in environmental problem, actively pushes forward nuclear energy exploitation, is that China's energy is built
If an important policies.Nuclear energy, greatly developing for nuclear power require that sufficient resource must be ensured from source.In view of uranium ore is provided
Source has the status of double action in national defence and the development of the national economy, and China will keep the international status of nuclear power, just necessary
There is the uranium resource of abundance as guarantee, a collection of uranium resource is verified as early as possible, have become that uranium geology battle line faces is very urgent
Task.
At present in uranium exploration, radioactivity survey is still the prefered method of looking for Uranium Deposit, wherein portable gamma-ray spectrometry
Instrument is one of most important, most widely used equipment.But there is the deficiency in terms of following four in conventional portable gamma spectrometer：
1st, not strong to detection body surface adaptability, field is difficult to obtain ideal data.
2nd, sensitivity is not high enough, and measurement data stability is poor.
3rd, detection directive property is not strong, it is impossible to effectively reflects sensing point subsurface information.
4th, there is the disadvantage of " spectrum drift ".
Many years have been developed in large-scale instrument indoors in anti-Compton energy spectrum analysis method and anticoincidence detection method,
Normally only use indoors.External ORTEC companies are proposed a " portable " anti-Compton spectrometer, and its weight is not less than
100kg, is appropriate only for field guard station and uses, and related detector must provide liquid nitrogen cooling, and its complicated, cost is high, again
Amount is high, is not easy to field worker and easily carries instrument to test everywhere.
The content of the invention
In view of this, a kind of portable anti-Compton survey meter that the present invention is provided, the anti-Compton survey meter has knot
Structure is simple, cost is low, portable advantage.
For achieving the above object, the technical solution adopted in the present invention is：A kind of portable anti-Compton survey meter,
Including top electronics element cell and bottom probe chamber, the bottom probe chamber enclosed inside has main detector, main spy
Survey device periphery and multiple anticoincidence detectors are set, multiple anticoincidence detector outer layers are designed with screen layer；
The main detector lower end is designed with window, and the main detector includes scintillation crystal with anticoincidence detector,
The scintillation crystal top surface posts the optical coupling material that profile is cone, and photodiode is posted in the side of optical coupling material, institute
Photodiode is stated to be connected with spectrum stabilization circuit, pre-amplification circuit and bias power supply circuit respectively；
The electronics element cell includes summing circuit and the multi-channel analysis circuit with anticoincidence circuit, the summing circuit
Connected by the pre-amplification circuit of line between plate and probe chamber, the multi-channel analysis circuit with anticoincidence circuit and summation
Circuit is connected.
Preferably, the profile of the anti-Compton survey meter is cuboid, and main detector is cube or cuboid, 4
Profile is mutually spliced to form intersecting parallels structure for the anticoincidence detector of cuboid.
Preferably, the profile of the anti-Compton survey meter is cylinder, and main detector is cylindric, and multiple anticoincidence are visited
Survey device and be spliced to form the circular ring being engaged with main detector.
Preferably, the screen layer is made up of fine copper plate with wolfram steel plate or stereotype with wolfram steel plate double-layer structure, the shielding
Layer outer layer is designed with the overcoat of lead material composition.
Preferably, the top electronics element cell top surface is equipped with handle, and the battery of the electronics element cell uses volume
Surely the rechargeable battery of 7.2V voltages is exported, and each unit circuit of electronics element cell also includes output+12V Switching Power Supply
The Switching Power Supply reduction voltage circuit of booster circuit, output+3.3V and+5V and output -5V Switching Power Supply back-pressure translation circuit, institute
Reduction voltage circuit is stated using LT3480 chips, the back-pressure translation circuit uses MAX764 chips, the booster circuit is used
MAX761 chips.
Preferably, the scintillation crystal of the main detector uses LaBr3 ︰ Ce crystal or CsI：Tl crystal, the anticoincidence
The scintillation crystal of detector uses thickness for 4cm CsI：Tl crystal.
Preferably, the portion envelops reflecting layer not contacted in the lateral surface of the anticoincidence detector with main detector, instead
Meet the part contacted in the lateral surface of detector with main detector and reflecting layer parcel light shield layer.
Preferably, the main detector uses at least two photodiodes, and the anticoincidence detector uses at least one
Individual photodiode.
Preferably, the number of the photodiode is identical with the number of bias power supply circuit with pre-amplification circuit.
Preferably, the bias power supply circuit provides+70V voltages for photodiode, and uses LT3482 chip solutions.
The invention has the advantages that：In the inventive solutions, because using main detector with it is multiple anti-
Meet the co-ordinative construction of detector, the gamma rays for selectively detecting and being projected upwards from underground near normal can be realized, improve
The directive property of anti-Compton survey meter；It can effectively suppress photodiode in conjunction with the multi-channel analysis circuit with anticoincidence circuit
Noise, cosmic-ray background, air and surrounding environment gamma background, Compton scattering ray so that anti-Compton survey meter has
High and high resolution the advantage of sensitivity；Volume can simply be effectively reduced using photodiode and bias power supply circuit design
And weight, the main screw lift of anti-Compton survey meter is less than 10kg.So that the anti-Compton survey meter of the present invention has structure letter
Single, cost is low and light portative advantage.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of main detector and anticoincidence detector；
Fig. 3 is probe chamber cross-sectional structure schematic diagram；
Fig. 4 is main detector spectrum stabilization flow chart；
Fig. 5 is anticoincidence detector spectrum stabilization flow chart；
Fig. 6 is pre-amplification circuit schematic diagram of the invention；
Fig. 7 is summing circuit schematic diagram of the invention；
Fig. 8 is anti-Compton measurement procedure figure；
Fig. 9 is workflow diagram of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of protection of the invention is belonged to.
As shown in figure 1, a kind of portable anti-Compton survey meter be divided into above and below two parts, including top electronics unit
Room 3 and bottom probe chamber.The top surface of top electronics element cell 3 is equipped with handle 4, the bottom probe chamber and encapsulated
There are main detector 1 and multiple anticoincidence detectors 2, the main detector 1 is the part inside the detector of bottom, main detector 1
Lower end is designed with window 6, and the periphery of main detector 1 is then multiple anticoincidence detectors 2, multiple outer layers of anticoincidence detector 2
It is then screen layer 5.The bottom probe chamber output signal is transmitted to electronics element cell 3 by line between plate and carried out at analysis
Reason.
The electronics element cell 3 includes each unit circuit and battery, and the battery is rechargeable battery, electricity of the present invention
Pond rated output 7.2V voltages, are each circuit module by Switching Power Supply booster circuit, reduction voltage circuit and back-pressure translation circuit
Voltage needed for providing.The reduction voltage circuit uses LT3480 chips, obtains+3.3V and+5V the logic powers ,+5V logics electricity
Source can reach 2A by further filtering acquisition+5V analog powers, its output current, and operating efficiency can reach more than 80%.
The back-pressure translation circuit uses MAX764 chips, and the circuit output is -5V, it is possible to provide be up to 1.5W power.The liter
Volt circuit uses MAX761 chips, output voltage be+12V there is provided 150mA output current, it is left that its conversion efficiency is up to 90%
The right side, the circuit also provides battery electric quantity deficiency detection circuit, and cooperated with LED drive circuit indicates function there is provided battery electric quantity.This is anti-
Power-switching circuit high conversion efficiency used in the survey meter of Compton so that battery life is more than 9 hours.Electronics list
The each unit circuit of first room 3 is in addition to above-mentioned Switching Power Supply booster circuit, reduction voltage circuit and back-pressure translation circuit, in addition to summation
Circuit and the multi-channel analysis circuit with anticoincidence circuit, the summing circuit pass through the preposition amplification electricity of line between plate and probe chamber
Road connect, the multi-channel analysis circuit with anticoincidence circuit respectively with summing circuit, spectrum stabilization circuit, bias power supply circuit and
Palm display unit is connected.
It is more convenient that the effect of the handle 4 can carry staff, and handle 4 can be one with electronics element cell 3
Structure, can also be fixed by screw and similar approach is arranged on electronics element cell 3.
The screen layer 5, to take into account mechanical performance and shield effectiveness, the screen layer 5 is by two layers of high-purity copper plates and wolfram steel plate
Structure or stereotype are combined composition two layers with wolfram steel plate, and it is to reduce outer rays to enter anticoincidence detector 2 and cause vacation that it, which is acted on,
Meet event.The window 6 act as gamma ray and natural ray of the detection from the lower section of main detector 1.
As shown in Fig. 2 the main detector 1 and anticoincidence detector 2 include scintillation crystal 10, optical coupling material 11,
Optical read-out system 12, the optical read-out system 12 includes photodiode, spectrum stabilization circuit, pre-amplification circuit and bias supply
Circuit, and photodiode, spectrum stabilization circuit, pre-amplification circuit and bias power supply circuit be produced on one piece of pcb board.It is described
The top surface of scintillation crystal 10 posts optical coupling material 11, and the profile of optical coupling material 11 is cone, and its floor space and flicker are brilliant
The top area of body 10 matches；Post photodiode, and the lateral area and light of optical coupling material in the side of optical coupling material 11
The pcb board area that electric diode makes matches；The photodiode output end respectively with spectrum stabilization circuit, pre-amplification circuit
And bias power supply circuit connection.
As shown in figure 3, the portion envelops not contacted in the lateral surface of the multiple anticoincidence detector 2 with main detector 1
The part contacted in reflecting layer 9, the lateral surface of multiple anticoincidence detectors 2 with main detector 1 and reflecting layer parcel light shield layer
8.The reflecting layer 9 can not only exclude influence of the surrounding environment to probe chamber with light shield layer 8, moreover it is possible to avoid main detector 1
With the influence of the detection efficient of anticoincidence detector 2.
The gamma ray detected and natural ray are converted to photoelectron by the scintillation crystal 10.The main detector
1 scintillation crystal 10 uses LaBr3 ︰ Ce crystal or CsI：Main detector 1 uses LaBr3 ︰ Ce in Tl crystal, the present embodiment
Crystal, can make survey meter energy resolution be less than 4% (1760KeV of uranium).The scintillation crystal 10 of the anticoincidence detector 2 is adopted
The CsI for being 4cm with thickness：Tl crystal.
The optical coupling material 11 is by photoelectron coupled on photodiode, and optical coupling material uses high transmission rate material
Material, such as light transmittance is up to 94% acrylic material, improves photoelectronic collection efficiency.
The photodiode is received after incident photoelectron, and generation " electron-hole " is right, and then output current signal,
The current signal of output is directly proportional to incident photon.The main detector 1 uses multiple photodiodes, effective in order to improve
Photoelectron receiving area is so as to improve energy resolution, and the present embodiment main detector 1 is surveyed using 9 photodiodes
It is 3.76% (K-40 1460keV) to energy resolution, the resolution ratio to Cs-137 is 5.5%.It is connected with photodiode
The number of pre-amplification circuit is identical with the number of photodiode.The photodiode that the anticoincidence detector 2 is used
Number is at least one, and the photodiode number that the present embodiment anticoincidence detector 2 is used is 1, therefore corresponding preceding storing
The number of big circuit is also 1.
The spectrum stabilization circuit is made up of current monitoring circuit part A and temperature observation circuit part B, part A and part B
Complement each other and work simultaneously, to reach the effect of spectrum stabilization.As shown in figure 4, the part A input is connected with photodiode,
And output end is connected with the multi-channel analysis circuit with anticoincidence circuit of electronics element cell 3, the multiple tracks point of electronics element cell 3
The pressure feedback port for analysing circuit and bias power supply circuit is connected.The part A is mainly made up of current-voltage amplifier, can be adopted
With TI INA260 amplifiers.The reverse leakage current that the t1 moment monitors is output to multi-channel analysis circuit, multiple tracks by the part A
The reverse leakage current of t1 receptions is data signal by AD conversion and is saved in memory by analysis circuit, when multiple tracks point
When analysis circuit receives the reverse leakage current of next t2 moment part A transmission, multi-channel analysis circuit can be by t2 receptions
Reverse leakage current and the reverse leakage current at t1 moment are compared, when the reverse leakage current of t2 receptions is than t1 reception
When reverse leakage current is big, the output voltage of each bias power supply circuit can be turned down；When the reverse leakage current ratio of t2 receptions
The reverse leakage current hour of t1 receptions, can tune up the output voltage of each bias power supply circuit.Pass through reverse leakage current
Each photodiode voltage is finely tuned, makes each photodiode under the conditions of different temperatures, different counting rates, average drain currents
It is consistent.
As shown in figure 5, the part B monitoring temperature of scintillation crystal 10, output end and the electronics element cell 3 of part B
Multi-channel analysis circuit is connected.The part B is mainly made up of temperature sensor, and the temperature of scintillation crystal 10 is detected by temperature sensor
The temperature transition detected is sent to multi-channel analysis circuit, the multi-channel analysis electricity by degree, the temperature sensor into magnitude of voltage
The magnitude of voltage of each photodiode is finely tuned on road according to temperature, voltage response, makes photodiode in different temperatures environment
Under, the supercharging being consistent, the temperature of photodiode, voltage response are in linear relation, by formula y=0.0567x-
1.394 represent, y represents the trim voltage value of voltage in formula, and unit is V, and x is temperature, unit DEG C.Table 1 is spectrum stabilization B circuits pair
The actual characteristic test value of different temperatures and design characteristics calculated value.
Table 1
| T(℃) | Δ HV measured values (V) | Δ HV design loads (V) |
| 3.8 | -1.176 | -1.179 |
| 4.5 | -1.130 | -1.139 |
| 5.0 | -1.104 | -1.111 |
| 6.0 | -1.048 | -1.054 |
| 9.9 | -0.832 | -0.833 |
| 15.0 | -0.570 | -0.544 |
| 24.8 | 0.022 | 0.011 |
| 26.5 | 0.128 | 0.108 |
| 28.0 | 0.200 | 0.193 |
| 32.0 | 0.425 | 0.419 |
The data in table, the output of circuit meets desired design value, and linear fit, fitting side are carried out according to measured value
Cheng Wei：Y1=0.0569x1-1.3928.Measured value fit equation slope is 0.35% with design load equation slope difference, and is cut
Away from difference only influence the absolute value of spectral line peak position, have no effect on spectrum drift, so temperature can effectively be solved to photodiode band
The influence come, so as to solve the larger problem of spectrum drift.The spectrum stabilization circuit causes the spectrum stabilization performance of photodiode with using photoelectricity times
Increase pipe conventional energy disperse spectroscopy be in same magnitude, about ± 0.5 road/DEG C.
Bias power supply circuit bias voltage for needed for being provided photodiode, and photodiode needs independent supply
Electricity, therefore the quantity of photodiode is as the quantity of bias power supply circuit.The bias power supply circuit can be encapsulated to detector
Room, can also place electronics element cell 3.Bias power supply circuit of the present invention is using integrated boost type Switching Power Supply combination charge pump
Mode, the present embodiment power supply chip uses LT3482 schemes, other IC products of Linear Tech can be also used certainly, such as
LT3571.The bias power supply circuit input voltage is+9.6V, and output voltage is+70V, provides+70V for photodiode steady
Determine voltage.It can realize that output area covers 60~80V by power supply chip described in actual test, Ripple Noise is less than 5mV, such as
Fruit Ripple Noise, which is unsatisfactory for requirement, further to reduce noise by adding what RC filter circuit so that bias power supply circuit is defeated
Go out voltage stability high, Ripple Noise is low, high conversion efficiency, improve the endurance of anti-Compton survey meter and sensitive
Degree.The area of the bias power supply circuit pcb board is suitable with a mao coin area, and the bias power supply circuit is succinctly small
Ingeniously, the volume and weight of anti-Compton survey meter are greatly reduced.
Fig. 6 is pre-amplification circuit schematic diagram, and the pre-amplification circuit is an encapsulation on the photodiode fast
Current amplification circuit, processing is amplified by the current signal that photodiode is exported.The current signal enters input I
Afterwards, voltage signal is converted to after sampling resistor R40, voltage signal passes through the accurate non-inverting amplifier U8B of high input impedance
Amplification output, has because photodiode output current signal is present in dark current, therefore the output signal of pre-amplification circuit
DC component, the DC component, output voltage arteries and veins can be isolated by being coupled in the output end O of pre-amplification circuit using electric capacity C39
Rush signal.The pre-amplification circuit is not only amplified processing to current signal, moreover it is possible to effectively suppress making an uproar for photodiode
Sound, the further sensitivity for improving anti-Compton survey meter.
As shown in fig. 7, the pulse that the summing circuit of the electronics element cell 3 will be exported by multiple pre-amplification circuits
Signal carries out summation process, and the output end of multiple pre-amplification circuits is connected with multiple input channels of summing circuit respectively, this
Summing circuit only draws tetra- input channels of I1-I4, four pulse signals point of four pre-amplification circuit output in embodiment
Do not entered in operational amplifier U1A, carried out by operational amplifier U1A after summation process by tetra- input channels of I1-I4
Exported by passage O1, the input channel number of summing circuit is determined according to actual photodiode number, such as the present embodiment
Main detector 1 is using 9 photodiodes, then the input channel number for the summing circuit being connected with main detector 1 is 9, and
The anticoincidence detector 2 of the present embodiment employs 1 photodiode, therefore and need not carry out summation process.
The multi-channel analysis circuit with anticoincidence circuit of the electronics element cell 3 includes anticoincidence circuit and multi-channel analysis
Circuit.The anticoincidence circuit on one piece of circuit board, not only reduces circuitry plate quantity with multi-channel analysis circuit production
And reduce line between plate, interfered while avoiding line between plate with device on circuit board, improve circuit level
And circuit reliability.The anticoincidence circuit is with CPLD (Complex programmable logical device) for core, and additional adjustable delay unit is with believing
Number width adjustment unit.The Complex programmable logical device is logic circuit, for realizing that anti-Compton is measured, as shown in figure 8, i.e.
Only main detector 1 detects signal, and multiple anticoincidence detectors 2 any one do not detect signal, just output one
Receive signal and notify that signal is the letter for excluding Compton effect and photon escape in the multi-channel analysis circuit moment main detector 1
Number.The acting as of the adjustable delay unit eliminates each detector time difference problem, and the signal width adjustment unit is act as
Each detector output signal pulsewidth is adjusted, to meet the requirement of anti-health measurement.The multi-channel analysis circuit uses arm processor,
Quasi- Gauss integration circuit is also included simultaneously, and the quasi- Gauss integration circuit is meeting symbol using 3 grades of Second Order Integral circuit realirations
Close anticoincidence circuit output signal after requiring to be molded using quasi- Gauss integration shaping circuit, to solve the asymmetric of the signal
The high-frequency noise being superimposed in characteristic, and signal.The data signal of the quasi- Gauss integration circuit output of arm processor is handled,
It is accumulated as measuring spectral line, the spectral line of collection is divided into the spectral line after original spectral line and anticoincidence by ARM, while record is met into event
Information, in time of measuring, ARM timings are to palm display unit transmission measurement spectral line.Multi-channel analysis with anticoincidence circuit
Circuit can effectively suppression circuit noise, cosmic-ray background, effectively suppress air and surrounding environment gamma background, effectively suppress Kang Pu
Pause scattered ray, lower than the background of conventional spectrometer 20 to 60 times.
With reference to shown in Fig. 1-9, in use, incident photon first passes around window 6 by main detector 1 to the present invention
Scintillation crystal receives and produces photon, while being coupled to by the optical coupling material in main detector 1 in 9 photodiodes simultaneously
By 9 passage pre-amplification circuit output pulse signals, summing circuit carries out summation process to output pulse signal.Incident photon
The higher photon of middle energy will also enter multiple anticoincidence detectors 2 in by optical coupling material be coupled to photodiode in simultaneously
By pre-amplification circuit output pulse signal；Then, the arteries and veins that anticoincidence circuit will be exported to the summing circuit of main detector 1
The pulse signal for rushing signal and the output of multiple anticoincidence detectors 2 carries out coincidence measurement, because of the higher incident photon of energy simultaneously
The output pulse signal in main detector 1 and anticoincidence detector 2, therefore be unsatisfactory for meeting the requirements, it will higher to energy enters
Penetrate photon to mask, because the relatively low incident photon of energy can only be met the requirements by the output pulse signal of main detector 1, satisfaction；
Subsequently, satisfactory output pulse signal is molded by quasi- Gauss integration shaping circuit, recently enters multiple tracks
Analysis circuit is analyzed and processed, in time of measuring, and multi-channel analysis circuit is regularly to palm display unit transmission measurement spectral line.
Anti-Compton survey meter of the present invention is met based on many photodiodes, Multi probe to be penetrated with the noise and background of anticoincidence
Line suppressing method effectively suppresses the noise of optical read-out device, effectively suppresses cosmic-ray background, effectively suppresses air and surrounding environment
Gamma background, effectively suppression Compton scattering ray so that the sensitivity of instrument and high resolution；Along with from higher detection
The LaBr3 ︰ Ce crystal of efficiency type causes the sensitivity of instrument further to be improved with resolution ratio；Using multi-detector united mode
The gamma rays for selectively detecting and being projected upwards from underground near normal can be realized, effectively reflection sensing point underground can be more concentrated
Diameter about 5cm, depth up to uranium element in nearly 1m circular cone column Rocks, Soils average content, it is sensitiveer to abnormal judgement with
Accurately so that the directive property of anti-Compton survey meter is good；Meet detection using many photodiodes, will cause detector has small
Volume, high-resolution and the advantage of low spectrum drift；Along with the element circuit of small size causes instruments weight of the present invention to be less than 10Kg,
With simple in construction, cost is low and portable advantage.
Enter preferably, a kind of basic structure of portable anti-Compton survey meter is that main detector 1 is nested
" well " type anticoincidence detector 2, a kind of profile of portable anti-Compton survey meter of the present embodiment is cuboid, main detector
1 is cube or cuboid, and 4 profiles are mutually spliced into intersecting parallels structure for the anticoincidence detector 2 of cuboid.
Preferably, a kind of profile of portable anti-Compton survey meter can also be cylinder, main detector 1 can
To be cylindric, multiple anticoincidence detectors 2 are spliced into the circular ring being engaged with main detector 1, and so-called be engaged refers to
Main detector 1 can just be put into the circular ring that multiple anticoincidence detectors 2 are constituted.
Preferably, the probe chamber designs the overcoat 7 being made up of lead material of set of complementary, the overcoat 7
By bottom panel, front panel, rear side panel, Left-Hand Panel, right panel, totally 5 parts are constituted, and Tenon knot is used between part
Structure is quickly interconnected.In order to mitigate carry anti-Compton survey meter when weight, the overcoat 7 be designed to it is detachable, detection
When again by overcoat 7 be arranged on anti-Compton survey meter on, the overcoat 7 allow guard station analysis when substantially reduces environment
The influence of background activity, on the premise of precision is ensured, shortens time of measuring, realizes quick analysis.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of portable anti-Compton survey meter, including top electronics element cell (3) and bottom probe chamber, it is described under
Portion's probe chamber enclosed inside has main detector (1), and main detector (1) periphery sets multiple anticoincidence detectors (2), multiple anti-
Meet detector (2) outer layer and be designed with screen layer (5)；
It is characterized in that：Main detector (1) lower end is designed with window (6), the main detector (1) and anticoincidence detector
(2) scintillation crystal (10) is included, scintillation crystal (10) top surface posts the optical coupling material (11) that profile is cone, optocoupler
Photodiode is posted in the side of condensation material (11), and the photodiode is electric with pre-amplification circuit and bias supply respectively
Road is connected；
The electronics element cell (3) includes summing circuit and the multi-channel analysis circuit with anticoincidence circuit, the summing circuit
Connected by the pre-amplification circuit of line between plate and probe chamber, the multi-channel analysis circuit with anticoincidence circuit and summation
Circuit is connected.
2. a kind of portable anti-Compton survey meter according to claim 1, it is characterised in that：The anti-Compton detection
The profile of instrument is cuboid, and main detector (1) is cube or cuboid, and 4 profiles are the anticoincidence detector (2) of cuboid
Mutually it is spliced to form intersecting parallels structure.
3. a kind of portable anti-Compton survey meter according to claim 1, it is characterised in that：The anti-Compton detection
The profile of instrument is cylinder, and main detector (1) is cylindric, and multiple anticoincidence detectors (2) are spliced to form and main detector (1)
The circular ring being engaged.
4. a kind of portable anti-Compton survey meter according to Claims 2 or 3, it is characterised in that：The screen layer (5)
It is made up of fine copper plate with wolfram steel plate or stereotype with wolfram steel plate double-layer structure, screen layer (5) outer layer is designed with lead material composition
Overcoat (7).
5. a kind of portable anti-Compton survey meter according to Claims 2 or 3, it is characterised in that：The top electronics
Learn element cell (3) top surface and handle (4) is housed, the electronics element cell (3) uses the chargeable electricity of rated output 7.2V voltages
Pond, and electronics element cell (3) also the Switching Power Supply booster circuit including output+12V, output+3.3V and+5V Switching Power Supply
The Switching Power Supply back-pressure translation circuit of reduction voltage circuit and output -5V, the reduction voltage circuit uses LT3480 chips, the back-pressure
Translation circuit uses MAX764 chips, and the booster circuit uses MAX761 chips.
6. a kind of portable anti-Compton survey meter according to Claims 2 or 3, it is characterised in that：The main detector
(1) scintillation crystal (10) uses LaBr3 ︰ Ce crystal or CsI：Tl crystal, the scintillation crystal of the anticoincidence detector (2)
(10) thickness is used for 4cm CsI：Tl crystal.
7. a kind of portable anti-Compton survey meter according to Claims 2 or 3, it is characterised in that：The anticoincidence is visited
The portion envelops reflecting layer (9) not contacted in the lateral surface for surveying device (2) with main detector (1), the outside of anticoincidence detector (2)
The part contacted in face with main detector (1) and reflecting layer (9) parcel light shield layer (8).
8. a kind of portable anti-Compton survey meter according to Claims 2 or 3, it is characterised in that：The main detector
(1) at least two photodiodes are used, the anticoincidence detector (2) uses at least one photodiode.
9. a kind of portable anti-Compton survey meter according to claim 8, it is characterised in that：The photodiode
Number is identical with the number of bias power supply circuit with pre-amplification circuit.
10. a kind of portable anti-Compton survey meter according to claim 9, it is characterised in that：The bias supply electricity
Road provides+70V voltages for photodiode, and uses LT3482 chip solutions.
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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 |
| CN112068180A (en) * | 2020-09-15 | 2020-12-11 | 成都理工大学 | Online measuring device and method for alpha and beta radioactive nuclides in water body |
| CN112180423A (en) * | 2019-07-04 | 2021-01-05 | 核工业西南物理研究院 | Magnetic confinement nuclear fusion gamma ray detector with Compton inhibition function |
| CN112799115A (en) * | 2020-12-29 | 2021-05-14 | 中国原子能科学研究院 | Measuring system and method |
| CN113835114A (en) * | 2021-08-25 | 2021-12-24 | 吉林大学 | Compact high-energy gamma ray anti-coincidence laminated detector |
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| CN112180423A (en) * | 2019-07-04 | 2021-01-05 | 核工业西南物理研究院 | Magnetic confinement nuclear fusion gamma ray detector with Compton inhibition function |
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| CN113835114B (en) * | 2021-08-25 | 2024-04-26 | 吉林大学 | Compact high-energy gamma ray anti-coincidence laminated detector |
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