CN206057587U - A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors - Google Patents
A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors Download PDFInfo
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- CN206057587U CN206057587U CN201621071960.8U CN201621071960U CN206057587U CN 206057587 U CN206057587 U CN 206057587U CN 201621071960 U CN201621071960 U CN 201621071960U CN 206057587 U CN206057587 U CN 206057587U
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- dose rate
- crystal
- preamplifier
- rate instrument
- tellurium
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Abstract
This utility model belongs to Radiation monitoring technical field, discloses a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors.The dose rate instrument includes detector system, signal processing system and control circuit system；The detector system includes two dome-type CZT crystal, preamplifier and circuit boards；The control circuit system includes high-voltage power module, low-tension supply module, portable module power supply and battery management chip；The signal processing system includes two-channel digital multiple tracks, signal processing software, liquid crystal touch screen and computer.The dose rate instrument has the high beneficial effect of energy resolution height, detection efficient.
Description
Technical field
This utility model belongs to Radiation monitoring technical field, and in particular to a kind of agent based on double hemisphere tellurium-zinc-cadmium detectors
Dose rate instrument.
Background technology
Cadmium-zinc-teiluride (hereinafter referred to as CZT) crystal is used for into the maturation of the Technical comparing in terms of Radiation monitoring both at home and abroad, at present
Jing discloses plane, mixing handheld, Frisch's grid-type and dome-type tellurium-zinc-cadmium detector etc., and wherein dome-type CZT is visited
Survey device shape and be generally cuboid, electric field is class dome-type, therefore those skilled in the art are commonly referred to as dome-type CZT spies
Survey device.Wang Ying etc. is disclosed for 2014《Multi-functional dose rate instrument applied research based on dome-type tellurium-zinc-cadmium detector》This
Document, and elaborate to detect based on dome-type CZT in terms of energy range, energy resolution, environmental suitability and angular response etc.
The suitability of the device as multi-functional dose rate instrument, the document are to be merged into one using two dome-type CZT detector common-anodes
Class ball-type CZT detector, but detector disclosed in the document yet suffers from the relatively low problem of detection efficient and energy resolution.
Utility model content
(1) utility model purpose
According to the problems of prior art, it is high that this utility model provides a kind of energy resolution height, detection efficient
Dose rate instrument.
(2) technical scheme
In order to solve the problems of prior art, the technical scheme that this utility model is provided is as follows：
A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors, the dose rate instrument are included at detector system, signal
Reason system and control circuit system；
The detector system includes two dome-type CZT crystal, a preamplifier and circuit board, two dome-types
The shape of CZT crystal, structure are identical with size, are cuboid；Each dome-type CZT crystalline areas maximum
One face connects positive high voltage, is anode, and other 5 face ground connection are negative electrode；Two crystal are fixed on electricity by the way of left and right is put
On the plate of road, a preamplifier below circuit board, is provided with, the negative electrode pin of two hemispherical CZT crystal links together altogether
One high pressure, is output as signal all the way, in the signal transmission that X, gamma-rays are produced on CZT crystal to the preamplifier；
The maximum cathode plane of two crystalline areas is left and right adjacent surface, and two adjacent surfaces are brought into close contact；Two crystal, the circuits
Plate and preamplifier are located in a cylindrical housing, the center position of two crystal in the radial centre lines of cylinder and
Against barrel, the probe body carries out encapsulation process to anode surface；
The control circuit system includes high-voltage power module, low-tension supply module, portable module power supply and cell tube
Reason chip, wherein high-voltage power module, low-tension supply module is connected with preamplifier by circuit respectively, and circuit and cylinder
Connected by aerial plug-in unit with encapsulation process between shape shell；High-voltage power module provides high pressure for two dome-type CZT crystal,
Low-tension supply module provides the running voltage of ± 12V for preamplifier；
The signal processing system includes single channel digital multiple tracks, signal processing software, liquid crystal touch screen and computer, from
The holding wire all the way that preamplifier is drawn enters single channel digital multiple tracks, and single channel digital multiple tracks is exported to preamplifier
Signal is processed, and is accordingly measured power spectrum, is measured power spectrum and is passed through liquid crystal touch screen or computer of the software in the system again
Upper display.The signal processing system can provide complete digital pole-zero cancellation, digital filtering molding, peak value judgement and extraction, energy
Spectrum systematic function.
Preferably, the preamplifier is low noise charge sensitive preamplifier.
Preferably, the size of the dome-type CZT crystal is 10mm × 10mm × 5mm.
Preferably, the cylindrical housing is aluminum hull, and wherein aluminum hull thickness is 1mm, and the center position of two crystal is in
The center of cylinder and anode surface is against barrel.
Preferably, the portable module power supply is lithium battery group, is used when going out to carry, battery management chip control electricity
Pond electricity service condition.
Preferably, the periphery of described two dome-type CZT crystal is wrapped in the epoxy resin parcel of one layer of black.
Preferably, the high-voltage power module is 0～1500V for the high pressure that preamplifier is provided.
(3) beneficial effect
The dose rate instrument that this utility model is provided, the detector include two dome-type CZT crystal, a preamplifier
With single channel digital multiple tracks, common-anode combination is adopted from existing two dome-types CZT crystal and electric field is different for class ball-type, this
Utility model adopts cathode plane and places for the mode of adjacent surface i.e. " common cathode ", the electric field non-sphere of combination, from two-way CZT crystal
The signal of output accesses preamplifier all the way, enters back into digital single track and is processed.Using such CZT crystal combinations sides
Formula and signal processing mode can be improved to X/ gamma-ray detections efficiency and energy resolution.Test is proved to Am-241
(59.5keV) detection efficient improves about 13 times, improve about 14.6% to the energy resolution of different radioactive sources-
22.7%.It is concrete as shown in table 1.
The energy resolution of 1 different-energy ray of table
| Energy resolution under the conditions of common-anode | Energy resolution under the conditions of the application | |
| Am-241 | 10.3% | 8.33% |
| Cs-137 | 4.18% | 3.23% |
| Co-60 | 3.55% | 3.03% |
Description of the drawings
Fig. 1 is two dome-type CZT crystal disposing way schematic diagrams in the dose rate instrument that the application is provided；Wherein 1 is half
The anode surface of ball-type CZT crystal, 2 is dome-type CZT crystal.
Fig. 2 is that energy range is with MCNP method simulated range dose rate instrument 10cm under the conditions of common-anode and common cathode
The single of 10keV-2MeV can point source detection efficient analog result schematic diagram；
Specific embodiment
This utility model is further elaborated below in conjunction with specification drawings and specific embodiments.
Embodiment
A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors, the dose rate instrument are included at detector system, signal
Reason system and control circuit system；
The detector system includes two dome-type CZT crystal 2, preamplifier and a circuit board, two hemisphere
The shape of type CZT crystal, structure are identical with size, are the cuboid of 10mm × 10mm × 5mm；Described each hemisphere
It is anode that a maximum face of type CZT crystalline areas connects positive high voltage, and other 5 faces ground connection are negative electrode；Two crystal are using left and right
The mode put is installed on circuit boards, and a preamplifier, the sun of two hemispherical CZT crystal are provided with below circuit board
Pole pin links together one high pressure totally, is output as signal all the way, and the signal transmission that X, gamma-rays are produced on CZT crystal is extremely
On the preamplifier；The maximum cathode plane of two crystalline areas is left and right adjacent surface, and two adjacent surfaces are closely pasted
Close；Two crystal, circuit board and the preamplifiers are located in a cylindrical housing, and wherein aluminum hull thickness is 1mm, and two brilliant
The center position of body is in the radial centre lines of cylinder and anode surface is against barrel；
The control circuit system includes high-voltage power module, low-tension supply module, portable module power supply and cell tube
Reason chip, wherein high-voltage power module, low-tension supply module is connected with preamplifier by circuit respectively, and the circuit and circle
Encapsulation process between cylindrical outer casing；High-voltage power module provides 1000V high pressure, low-tension supply mould for two dome-type CZT crystal
Block provides the running voltage of ± 12V for preamplifier；
The signal processing system includes single channel digital multiple tracks, signal processing software, liquid crystal touch screen and computer, from
Preamplifier holding wire all the way out enters single channel digital multiple tracks, and single channel digital multiple tracks is exported to preamplifier
Signal is processed, and is accordingly measured power spectrum, is measured power spectrum and is passed through liquid crystal touch screen or computer of the software in the system again
Upper display.The signal processing system can provide complete digital pole-zero cancellation, digital filtering molding, peak value judgement and extraction, energy
Spectrum systematic function.
The portable module power supply is lithium battery group, is used when going out to carry, battery management chip control battery electric quantity
Service condition.
The periphery of described two dome-type CZT crystal is wrapped in the epoxy resin parcel of one layer of black.
Single energy point source of the energy range for 10keV-2MeV is located above detector, range finder center 10cm.
MCNP emulation is carried out to the detector geometry of " common cathode " and " common-anode " respectively in the case that other conditions are consistent, is obtained
Peak detection efficient in source is as shown in Figure 2.As can be seen from Figure 2, double dome-type CZT crystal " common cathode " relative to " common-anode " in mental retardation
In amount area, its detection efficient is significantly improved.
Claims (7)
1. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors, it is characterised in that the dose rate instrument includes detector system
System, signal processing system and control circuit system；
The detector system includes two dome-type CZT crystal, a preamplifier and circuit board, two dome-type CZT
The shape of crystal, structure are identical with size, are cuboid；The one of each dome-type CZT crystalline areas maximum
Individual face connects positive high voltage, is anode, and other 5 face ground connection are negative electrode；Two crystal are fixed on circuit by the way of left and right is put
On plate, a preamplifier below circuit board, is provided with, the negative electrode pin of two hemispherical CZT crystal links together totally one
Individual high pressure, is output as signal all the way, in the signal transmission that X, gamma-rays are produced on CZT crystal to the preamplifier；Should
The maximum cathode planes of two crystalline areas are left and right adjacent surface, and two adjacent surfaces are brought into close contact；Two crystal, the circuit boards
And preamplifier is located in a cylindrical housing, the center position of two crystal is in the radial centre lines of cylinder and positive
Against barrel, the probe body carries out encapsulation process to pole-face；
The control circuit system includes high-voltage power module, low-tension supply module, portable module power supply and battery management core
Piece, wherein high-voltage power module, low-tension supply module are connected with preamplifier by circuit respectively, and outside circuit and cylindrical shape
Connected by aerial plug-in unit with encapsulation process between shell；High-voltage power module provides high pressure, low pressure for two dome-type CZT crystal
Power module provides the running voltage of ± 12V for preamplifier；
The signal processing system includes single channel digital multiple tracks, liquid crystal touch screen and computer.
2. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
Preamplifier is low noise charge sensitive preamplifier.
3. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
The size of dome-type CZT crystal is 10mm × 10mm × 5mm.
4. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
Cylindrical housing is aluminum hull, and wherein aluminum hull thickness is 1mm, the center position of two crystal center and anode surface pair in cylinder
Barrel.
5. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
Portable module power supply is lithium battery group.
6. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
The periphery of two dome-type CZT crystal is wrapped in the epoxy resin parcel of one layer of black.
7. a kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors according to claim 1, it is characterised in that described
High-voltage power module is 0～1500V for the high pressure that preamplifier is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621071960.8U CN206057587U (en) | 2016-09-22 | 2016-09-22 | A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621071960.8U CN206057587U (en) | 2016-09-22 | 2016-09-22 | A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206057587U true CN206057587U (en) | 2017-03-29 |
Family
ID=58367118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621071960.8U Active CN206057587U (en) | 2016-09-22 | 2016-09-22 | A kind of dose rate instrument based on double hemisphere tellurium-zinc-cadmium detectors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206057587U (en) |
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2016
- 2016-09-22 CN CN201621071960.8U patent/CN206057587U/en active Active
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