CN206990810U - A kind of portable anti-Compton survey meter - Google Patents
A kind of portable anti-Compton survey meter Download PDFInfo
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- CN206990810U CN206990810U CN201720941797.4U CN201720941797U CN206990810U CN 206990810 U CN206990810 U CN 206990810U CN 201720941797 U CN201720941797 U CN 201720941797U CN 206990810 U CN206990810 U CN 206990810U
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- anticoincidence
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- detector
- survey meter
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Abstract
It the utility model is related 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.Anti-Compton survey meter of the present utility model has the advantages of simple in construction, cost is low and light portable.
Description
Technical field
Ore deposit field of detecting is the utility model is related to, particularly relates to a kind of portable anti-Compton survey meter.
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 provides
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
Have abundance uranium resource as ensure, verify a collection of uranium resource as early as possible, have become uranium geology battle line face it 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 not easy to obtain ideal data.
2nd, sensitivity is not high enough, and measurement data stability is poor.
3rd, it is not strong to detect directive property, it is impossible to effectively reflection sensing point subsurface information.
4th, the disadvantage of " spectrum drift " be present.
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, the use of field guard station is appropriate only for, and related detector must provide liquid nitrogen cooling, and its is 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 provided by the utility model, anti-Compton survey meter tool
There is the advantages of simple in construction, cost is low, is easy to carry.
In order to solve the above technical problems, technical scheme is used by the utility model：A kind of portable anti-Compton is visited
Instrument is surveyed, including top electronics element cell and bottom probe chamber, the bottom probe chamber enclosed inside have main detector,
Main detector periphery sets multiple anticoincidence detectors, and 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 connects.
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 and 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
State reduction voltage circuit and use LT3480 chips, the back-pressure translation circuit uses MAX764 chips, and the booster circuit uses
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 CsI of the thickness for 4cm：Tl crystal.
Preferably, the portion envelops reflecting layer contacted in the middle part of 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 using LT3482 chip sides
Case.
The utility model has the advantages that：In the technical solution of the utility model, because using main detector
With the co-ordinative construction of multiple anticoincidence detectors, it can realize that selectively detecting the gamma projected upwards from underground near normal penetrates
Line, improve the directive property of anti-Compton survey meter；It can effectively suppress photoelectricity in conjunction with the multi-channel analysis circuit with anticoincidence circuit
The noise of diode, cosmic-ray background, air and surrounding environment gamma background, Compton scattering ray so that anti-Compton is visited
Surveying instrument has the advantages of high sensitivity and high resolution；Simply can be effective using photodiode and bias power supply circuit design
Reduce volume and weight, the main screw lift of anti-Compton survey meter are less than 10kg.So that anti-Compton detection of the present utility model
Instrument has the advantages of simple in construction, cost is low and light portable.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
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 present utility model；
Fig. 7 is summing circuit schematic diagram of the present utility model；
Fig. 8 is anti-Compton measurement procedure figure；
Fig. 9 is workflow diagram of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole realities
Apply example.Based on the embodiment in the utility model, those of ordinary skill in the art institute under the premise of creative work is not made
The every other embodiment obtained, belong to the scope of the utility model protection.
As shown in figure 1, a kind of portable anti-Compton survey meter is divided into two parts up and down, including top electronics unit
Room 3 and bottom probe chamber.The top surface of top electronics element cell 3 is equipped with handle 4, is encapsulated in the bottom probe chamber
There are a main detector 1 and multiple anticoincidence detectors 2, the main detector 1 is the part inside the probe chamber 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 to be carried out at analysis
Reason.
The electronics element cell 3 includes each unit circuit and battery, and the battery is rechargeable battery, the utility model institute
Battery rated output 7.2V voltages are stated, are each circuit by Switching Power Supply booster circuit, reduction voltage circuit and back-pressure translation circuit
Voltage needed for module offer.The reduction voltage circuit uses LT3480 chips, obtains+3.3V and+5V logic powers, and+the 5V is patrolled
2A can be reached by further filtering acquisition+5V analog powers, its output current by collecting power supply, and operating efficiency can reach 80%
More than.The back-pressure translation circuit uses MAX764 chips, and the circuit output is -5V, it is possible to provide up to 1.5W power.
The booster circuit uses MAX761 chips, and output voltage is+12V, there is provided 150mA output current, its conversion efficiency are up to
90% or so, the circuit also provides battery electric quantity deficiency detection circuit, cooperated with LED drive circuit, there is provided battery electric quantity indicated work
Energy.Power-switching circuit high conversion efficiency used in this anti-Compton survey meter so that battery life is more than 9 hours.
The each unit circuit of electronics element cell 3 is in addition to above-mentioned Switching Power Supply booster circuit, reduction voltage circuit and back-pressure translation circuit, also
Multi-channel analysis circuit including summing circuit and with anticoincidence circuit, before the summing circuit is by line between plate and probe chamber
Put amplifying circuit connection, the multi-channel analysis circuit with anticoincidence circuit respectively with summing circuit, spectrum stabilization circuit, bias supply
Circuit and the connection of palm display unit.
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 include photodiode, spectrum stabilization circuit, pre-amplification circuit and bias supply
Circuit, and photodiode, spectrum stabilization circuit, pre-amplification circuit and bias power supply circuit are 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 contacted in the middle part of the lateral surface of the multiple anticoincidence detector 2 with main detector 1
Reflecting layer 9, the part contacted with main detector 1 in the lateral surface of multiple anticoincidence detectors 2 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：Tl crystal, main detector 1 is using LaBr3 ︰ Ce in the present embodiment
Crystal, survey meter energy resolution can be made to 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.
For the optical coupling material 11 by photoelectron coupled on photodiode, optical coupling material uses high transmission rate material
Material, as light transmittance is up to 94% acrylic material, improve photoelectronic collection efficiency.
After the photodiode receives incident photoelectron, 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 uses 9 photodiodes, surveys
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 uses
Number is at least one, and the photodiode number that the present embodiment anticoincidence detector 2 uses 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 while work, to have the function that 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 of electronics element cell 3
The pressure feedback port of analysis circuit and bias power supply circuit connects.The part A is mainly made up of current-voltage amplifier, can
Using TI INA260 amplifiers.The reverse leakage current that the t1 moment monitors is output to multi-channel analysis circuit by the part A, more
The reverse leakage current of t1 receptions is data signal by AD conversion and is saved in memory by trace analysis circuit, works as multiple tracks
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 compared with the reverse leakage current at t1 moment, when the reverse leakage current of t2 receptions is than t1 reception
Reverse leakage current it is big when, the output voltage of each bias power supply circuit can be turned down；When the reverse leakage current of t2 receptions
Than the reverse leakage current hour of t1 reception, the output voltage of each bias power supply circuit can be tuned up.Pass through reverse leakage
Stream finely tunes each photodiode voltage, makes each photodiode under the conditions of different temperatures, different counting rates, average electric leakage
Stream 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 connects.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 that is 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 V, x are 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 |
From 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, spectrum drift is had no effect on, so temperature can effectively be solved to photodiode band
The influence come, float larger problem so as to solve spectrum.The spectrum stabilization circuit causes the spectrum stabilization performance of photodiode with using photoelectricity times
The conventional energy disperse spectroscopy for increasing pipe is in same magnitude, about ± 0.5/DEG C.
The bias power supply circuit for photodiode provide needed for bias voltage, 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, it can also place electronics element cell 3.The utility model bias power supply circuit uses integrated boost type Switching Power Supply combination electric charge
The mode of pump, the present embodiment power supply chip use LT3482 schemes, can also use other IC products of Linear Tech certainly, such as
LT3571.The bias power supply circuit input voltage is+9.6V, and output voltage is+70V, and it is steady to provide+70V for photodiode
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 height, Ripple Noise is low, high conversion efficiency, improves 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, the current signal that photodiode exports is amplified processing.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, because photodiode output current signal has dark current, therefore has in the output signal of pre-amplification circuit
DC component, the DC component, output voltage arteries and veins can be isolated using electric capacity C39 couplings in the output end O of pre-amplification circuit
Rush signal.The pre-amplification circuit is not only amplified processing to current signal, moreover it is possible to effectively suppresses 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 export 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 by tetra- input channels of I1-I4 in operational amplifier U1A, after carrying out summation process by operational amplifier U1A
Exported by passage O1, the input channel number of summing circuit is determined according to the photodiode number of reality, such as the present embodiment
Main detector 1 uses 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, while avoid line between plate and interfered 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 measures, 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 adjustable delay unit act as eliminating 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,
Also include quasi- Gauss integration circuit simultaneously, 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 asymmetry 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, 20 to 60 times lower than the background of conventional spectrometer.
With reference to shown in Fig. 1-9, in use, incident photon first passes around window 6 by main detector 1 to the utility model
In scintillation crystal receive and produce photon, while 9 poles of photoelectricity two are coupled to by the optical coupling material in main detector 1
In pipe and pass through 9 passage pre-amplification circuit output pulse signals, summing circuit carries out summation process to output pulse signal.Enter
Penetrate the higher photon of energy in photon and will also enter in multiple anticoincidence detectors 2 and by optical coupling material be coupled to the pole of photoelectricity two
In pipe and by pre-amplification circuit output pulse signal；Then, anticoincidence circuit will be defeated to the summing circuit of main detector 1
The pulse signal gone out and the pulse signal of multiple anticoincidence detectors 2 output carry out coincidence measurement, because of the higher incident light of energy
The son output pulse signal in main detector 1 and anticoincidence detector 2 simultaneously, therefore be unsatisfactory for meeting the requirements, it will to energy compared with
High incident photon masks, because the relatively low incident photon of energy can only meet to meet by the output pulse signal of main detector 1
It is required that；Subsequently, satisfactory output pulse signal is molded by quasi- Gauss integration shaping circuit, recently entered
Multi-channel analysis circuit is analyzed and processed, and in time of measuring, multi-channel analysis circuit is regularly to palm display unit transmission measurement
Spectral line.
The utility model anti-Compton survey meter is met and the noise of anticoincidence and this based on more photodiodes, Multi probe
Bottom ray 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 suppress Compton scattering ray so that the sensitivity of instrument and high resolution；Along with selection is higher
The LaBr3 ︰ Ce crystal of detection efficient type causes the sensitivity of instrument further to be improved with resolution ratio；Joined using multi-detector
Syntype can realize the gamma rays for selectively detecting and being projected upwards from underground near normal, can more concentrate effectively reflection detection
Point underground diameter about 5cm, depth are up to the average content of uranium element in nearly 1m circular cone column Rocks, Soils, and the judgement to exception is more
It is sensitive with it is accurate so that the directive property of anti-Compton survey meter is good；Meet detection using more photodiodes, detector will be caused
The advantages of being floated with small size, high-resolution with low spectrum；Along with the element circuit of small size causes the utility model instrument weight
Amount is less than 10Kg, has the advantages of simple in construction, cost is low and is easy to carry.
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, the profile of portable anti-Compton survey meter of the present embodiment a kind of are cuboids, 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 form.
Preferably, the overcoat 7 being made up of lead material of the probe chamber design set of complementary, the overcoat 7
By bottom panel, front panel, rear side panel, Left-Hand Panel, right panel, totally 5 parts are formed, and Tenon knot is used between part
Structure quickly interconnects.Weight when carrying anti-Compton survey meter to mitigate, the overcoat 7 are designed to detachable, are detecting
When again by overcoat 7 be arranged on anti-Compton survey meter on, the overcoat 7 allow guard station analysis when substantially reduces ring
The influence of border background activity, on the premise of precision is ensured, shorten time of measuring, realize quick analysis.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (10)
1. a kind of portable anti-Compton survey meter, including top electronics element cell (3) and bottom probe chamber, under described
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 connects；
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 connects.
A kind of 2. 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.
A kind of 3. 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.
A kind of 4. 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 and 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).
A kind of 5. 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 use LT3480 chips, the back-pressure
Translation circuit uses MAX764 chips, and the booster circuit uses MAX761 chips.
A kind of 6. 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) CsI of the thickness for 4cm is used：Tl crystal.
A kind of 7. 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) contacted with main detector (1), the outside of anticoincidence detector (2) are surveyed in the middle part of the lateral surface of device (2)
The part contacted in face with main detector (1) and reflecting layer (9) parcel light shield layer (8).
A kind of 8. 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.
A kind of 9. 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.
A kind of 10. 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201720941797.4U CN206990810U (en) | 2017-07-31 | 2017-07-31 | A kind of portable anti-Compton survey meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720941797.4U CN206990810U (en) | 2017-07-31 | 2017-07-31 | A kind of portable anti-Compton survey meter |
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| CN206990810U true CN206990810U (en) | 2018-02-09 |
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| CN201720941797.4U Expired - Fee Related CN206990810U (en) | 2017-07-31 | 2017-07-31 | A kind of portable anti-Compton survey meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107219548A (en) * | 2017-07-31 | 2017-09-29 | 四川省核工业地质调查院 | A kind of portable anti-Compton survey meter |
| CN111610151A (en) * | 2020-05-19 | 2020-09-01 | 南昌大学 | Mobile vehicle-mounted electromagnetic wave multi-spectrometer system and imaging method |
| US11194060B2 (en) * | 2018-04-09 | 2021-12-07 | University Public Corporation Osaka | Electromagnetic radiation detector and method |
-
2017
- 2017-07-31 CN CN201720941797.4U patent/CN206990810U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107219548A (en) * | 2017-07-31 | 2017-09-29 | 四川省核工业地质调查院 | A kind of portable anti-Compton survey meter |
| CN107219548B (en) * | 2017-07-31 | 2023-10-27 | 四川省核地质调查研究所 | Portable anti-Compton detector |
| US11194060B2 (en) * | 2018-04-09 | 2021-12-07 | University Public Corporation Osaka | Electromagnetic radiation detector and method |
| CN111610151A (en) * | 2020-05-19 | 2020-09-01 | 南昌大学 | Mobile vehicle-mounted electromagnetic wave multi-spectrometer system and imaging method |
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