CN108279431A - A kind of portable radiant dosemeter and dosage monitoring equipment, segment processing method - Google Patents
A kind of portable radiant dosemeter and dosage monitoring equipment, segment processing method Download PDFInfo
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- CN108279431A CN108279431A CN201810412050.9A CN201810412050A CN108279431A CN 108279431 A CN108279431 A CN 108279431A CN 201810412050 A CN201810412050 A CN 201810412050A CN 108279431 A CN108279431 A CN 108279431A
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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
- G01T1/02—Dosimeters
- G01T1/026—Semiconductor dose-rate meters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The present invention relates to a kind of portable radiant dosemeter and dosage monitoring equipment, segment processing methods, belong to radiac technical field.The portable radiant dosemeter includes：CZT detector, signal processing system, processor and shielding case made of metal.CZT detector, signal processing system and processor couple successively, and CZT detector, signal processing system and processor may be contained in shielding case.Compared with prior art, since electric signal export to the CZT detector using signal processing system is amplified, shape, export after Screening Treatment and pre-processed to the processor, so as to amplitude, the pulsewidth etc. for changing output signal, to improve the dose linear of portable radiant dosemeter and dosage monitoring equipment, the operating voltage of the CZT detector be ensure that in the safe voltage for being down to human body, which still has higher detection efficient.
Description
Technical field
The invention belongs to radiac technical fields, and in particular to a kind of portable radiant dosemeter and dosage prison
Control equipment, segment processing method.
Background technology
People are also faced with special personal safety and Environmental security etc. while utilizing nuclear energy and nuclear technology extensively and ask
Topic.Therefore, to ensure in Application of Nuclear Technology the public and around the safety of ecological environment just need the dose rate instrument pair of environment grade
The environmental radiation dose of surrounding is monitored in real time.
The probe segment of main dosemeter is mainly G-M pipes and silicon diode on Vehicles Collected from Market, when dead due to G-M pipes
Between it is larger and relatively low to gamma-ray detection efficient, while the angular response of silicon diode is poor and it is to gamma-ray detection
The reasons such as efficiency is relatively low so that the application of the personal dosimeter of both types is limited by larger.And novel CZT is partly led
The dosemeter of bulk detector can make up G-M and manage defect low with silicon diode detection efficient and big the dead time.Therefore it is based on
The dose rate instrument of CZT semiconductor detectors is a kind of ideal X, gamma dose rate instrument.
CZT semiconductor detectors will realize that higher detection efficient then needs higher operating voltage, however for conduct
The personal dosimeter of household needs the operating voltage of detector to be down to the peace of human body based on feature safe and reliable, easy to carry
Full voltage.However, its detection efficient also reduces accordingly with the reduction of operating voltage of detector, therefore, how to ensure
In the case that detector has higher detection efficient, its operating voltage is down to the safe voltage of human body becomes industry concern
Focus.
Invention content
In consideration of it, at the purpose of the present invention is to provide a kind of portable radiant dosemeter and dosage monitoring equipment, segmentation
Reason method, to effectively improve the above problem.
What the embodiment of the present invention was realized in：
On the one hand, an embodiment of the present invention provides a kind of portable radiant dosemeters, including：CZT detector, signal processing
System, processor and shielding case made of metal.The CZT detector, the signal processing system, the processor
Coupling, the CZT detector, the signal processing system and the processor may be contained in the shielding case, the signal
Processing system is exported for being amplified, shaping to the electric signal that the CZT detector exports, after Screening Treatment to the processing
Device, the electric signal that the processor is used to export the signal processing system according to preset standard pre-process.
In preferred embodiments of the present invention, the signal processing system includes：Pre-amplifying module, preprocessing module and
Comparison module, the CZT detector, the pre-amplifying module, the preprocessing module and the comparison module couple successively；
Output is to institute after the electric signal for the CZT detector output that the pre-amplifying module is used to receive is amplified processing
State preprocessing module；The preprocessing module is for the electric signal that the pre-amplifying module exports to be formed, at amplification
Output is to comparison module after reason；The comparison module is used to that pre- bidding will to be met in electric signal that the preprocessing module exports
Accurate signal is exported to be handled to the processor.
In preferred embodiments of the present invention, the pre-amplifying module includes：Metal-oxide-semiconductor and the first amplifier, the MOS
The source electrode of pipe is grounded, and the drain of the metal-oxide-semiconductor is coupled with the first input end of first amplifier and the second input terminal respectively,
The grid of the metal-oxide-semiconductor is coupled with the output end of the CZT detector and first amplifier respectively, first amplifier
Output end also coupled with the preprocessing module.
In preferred embodiments of the present invention, the preprocessing module includes：Differential circuit and amplifying circuit, the differential
Circuit is coupled with the pre-amplifying module and the amplifying circuit respectively, and the amplifying circuit is coupled with the comparison module；
Amplification electricity is given in output after the differential circuit is used to the electric signal that the pre-amplifying module exports processing is formed
Road；Output is to comparison module after the amplifying circuit is used to the electric signal that the differential circuit exports being amplified processing.
In preferred embodiments of the present invention, the differential circuit is CR differential circuits.
In preferred embodiments of the present invention, the amplifying circuit includes：Second amplifier, the of second amplifier
One input terminal is coupled with the differential circuit, and the second input terminal of second amplifier is coupled with its output end, and described second
The output end of amplifier is coupled with the comparison module, and the second input terminal of second amplifier is also grounded.
In preferred embodiments of the present invention, the comparison module includes：Comparator, the first input end of the comparator
It is coupled with reference voltage, the second input terminal of the comparator is coupled with the preprocessing module, the output end of the comparator
It is coupled with the processor.
The embodiment of the present invention additionally provides a kind of dosage monitoring equipment, including：Control terminal and above-mentioned portable radiant
Dosemeter, the control terminal are coupled with the processor in the portable radiant dosemeter.
On the other hand, the embodiment of the present invention additionally provides a kind of segment processing method, the method be applied to it is above-mentioned just
It takes in formula dosimeter, the method includes：It obtains to X, gamma-ray response data；Judge whether the response data is small
In the first preset value, if the response data is less than the first preset value, according to the first default calibration factor and the institute of acquisition
It states response data and obtains dosage rate, if the response data is more than or equal to the first preset value, according to the second default calibration factor
And the response data obtained obtains dosage rate.
Portable radiant dosemeter provided in an embodiment of the present invention and dosage monitoring equipment, segment processing method, and it is existing
Technology is compared, and since the CZT detector has higher atomic number, thus the thickness for detecting material can reach a centimetre amount
Grade, to ensure that its outstanding detection efficient, in addition, also having energy resolution height, high sensitivity, small, light-weight
The features such as.In addition, the electric signal exported to the CZT detector using signal processing system is amplified, shaped, Screening Treatment
After export and handled to processor, so as to amplitude, the pulsewidth etc. for changing output signal, to improve portable radiant dosage
The dose linear of instrument and dosage monitoring equipment ensure that the operating voltage of the CZT detector in the safe voltage for being down to human body,
The portable radiant dosemeter still has higher detection efficient.The shielding case not only can protect CZT disposed within to visit
Device, signal processing system and processor are surveyed, its damage is avoided, to prolong the service life；But also can to avoid CZT detector,
Signal processing system and processor are interfered by external electromagnetic signal, to improve the accuracy of radiation dose rate.In addition, this hair
It is bright to be also equipped with：The advantages that detection efficient is good, high sensitivity, small, strong antijamming capability.
Other features and advantages of the present invention will be illustrated in subsequent specification, also, partly be become from specification
It is clear that being understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and is obtained in specification, claims and attached drawing.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.Shown in attached drawing, above and other purpose of the invention, feature and advantage will be more clear.In whole
Identical reference numeral indicates identical part in attached drawing.Actual size equal proportion scaling is not pressed deliberately draws attached drawing, emphasis
It is that the purport of the present invention is shown.
Fig. 1 shows a kind of structural schematic diagram of portable radiant dosemeter provided in an embodiment of the present invention.
Fig. 2 shows the structure diagrams of the signal processing system in Fig. 1 provided in an embodiment of the present invention.
Fig. 3 shows the circuit diagram of the pre-amplifying module in Fig. 2 provided in an embodiment of the present invention.
Fig. 4 shows the circuit diagram of the preprocessing module in Fig. 2 provided in an embodiment of the present invention.
Fig. 5 shows the circuit diagram of the comparison module in Fig. 2 provided in an embodiment of the present invention.
Fig. 6 shows the comparison diagram carried out to radiation dose rate before and after segment processing.
Fig. 7 shows the structure diagram of dosage monitoring equipment provided in an embodiment of the present invention.
Fig. 8 shows a kind of method flow diagram of segment processing method provided in an embodiment of the present invention.
Icon：10- portable radiant dosemeters；11- shielding cases；13-CZT detectors；15- signal processing systems；
151- pre-amplifying modules；152- preprocessing modules；1521- differential circuits；1522- amplifying circuits；153- compares mould
Block；17- processors；20- dosage monitoring equipment；21- control terminals.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "inner",
The orientation or positional relationship of the instructions such as "outside" be based on the orientation or positional relationship shown in the drawings or the invention product use
When the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or imply
Signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to this
The limitation of invention.In addition, term " first ", " second " etc. are only used for distinguishing description, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection ", " coupling " shall be understood in a broad sense, and can also be detachably to connect for example, it may be being fixedly connected
It connects, or is integrally connected；It can be mechanical connection, can also be electrical connection；It can be directly connected, intermediate matchmaker can also be passed through
Jie is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can be with concrete condition
Understand the concrete meaning of above-mentioned term in the present invention.
An embodiment of the present invention provides a kind of portable radiant dosemeters 10, as shown in Figure 1.The portable radiant dosemeter
10 include：CZT detector 13, signal processing system 15, processor 17 and shielding case 11.
The shielding case 11 is for protecting the CZT detector 13, the signal processing system 15 and processor 17, that is,
The CZT detector 13, signal processing system 15 and processor 17 may be contained in the shielding case 11.The shape of the shielding case 11
Shape can there are many, for example, it may be cuboid, can also be cylinder, can also be Elliptic Cylinder etc..The shielding case 11
It is made of metal material, for example, it may be iron, aluminium, copper etc., to protect CZT detector 13, signal processing system 15 and processor
17 from external electromagnetic signal interference, to improve the accuracy of radiation dose rate.In this present embodiment, it is preferable that the screen
It covers cover 11 and is provided with communication port (not shown), which couples with the processor 17.The communication port is used for
It is communicated with external equipment, is referred to external equipment, and the control of reception external equipment in order to export the signal of detection
It enables, convenient for processing such as update, the maintenances of portable radiant dosemeter 10.Wherein, which can be USB port, also may be used
To be the ports RS232, the communication port such as the ports RJ45 are can also be.
The CZT detector 13 is a kind of using detector made of CdZnTe ternary semiconductor materials, due to
Cadmium-zinc-teiluride (CdZnTe) has higher atomic number, thus the thickness for detecting material can reach centimetres, to ensure
Its outstanding detection efficient.CZT detector 13 is a kind of novel nuclear radiation detection component, output pulse signal, and probe is not necessarily to
Refrigeration has the characteristics that energy resolution height, high sensitivity, small, light-weight, is mainly used for X and the survey of gamma-ray power spectrum
Amount.The CZT detector 13 can be the CZT detector 13 being often used on the market at present, for example, the type of the CZT detector 13
Number can be DT-P01.Wherein it is preferred to which the generous size of the length of the CZT detector 13 is not more than (being less than or equal to)
20mmX20mmX10mm comprising sizes, for example, 20mmX20mmX8mm, 20mmX20mmX10mm,
10mmX20mmX5mm etc., in this present embodiment, it is further preferred that the generous size of the length of the CZT detector 13 is
20mmX20mmX5mm。
The signal processing system 15 is for being amplified the electric signal that CZT detector 13 exports, filtering, shaping, sieving
The processing such as choosing, analog-to-digital conversion, to improve the dose linear of portable radiant dosemeter 10.In this present embodiment, as shown in Fig. 2,
Preferably, the signal processing system 15 includes：Pre-amplifying module 151, preprocessing module 152 and comparison module 153.
The pre-amplifying module 151 is coupled with the CZT detector 13 and the preprocessing module 152 respectively, is used for
Output is to the preprocessing module 152 after the electric signal that the CZT detector 13 received exports is amplified processing.In
In the present embodiment, as shown in Figure 3, it is preferable that the pre-amplifying module 151 includes：Metal-oxide-semiconductor Q1 and the first amplifier U1.Institute
The source electrode ground connection for stating metal-oxide-semiconductor Q1, it is further preferred that the source electrode of the metal-oxide-semiconductor Q1 is grounded through first resistor R1.The metal-oxide-semiconductor
The drain of Q1 is coupled with the first input end of the first amplifier U1 and the second input terminal respectively, in addition, the metal-oxide-semiconductor Q1
Drain is also connect through second resistance R2 with+5V power supplys and the drain of the metal-oxide-semiconductor Q1 is also through 3rd resistor R3 and+5V power supplys
Connection.The grid of the metal-oxide-semiconductor Q1 is coupled with the output end of the CZT detector 13 and the first amplifier U1 respectively, excellent
The grid of selection of land, the metal-oxide-semiconductor Q1 is connect through the first capacitance C1 with the CZT detector 13；The grid of the metal-oxide-semiconductor Q1 also passes through
Second capacitance C2 is coupled with the output end of the first amplifier U1 and the grid of the metal-oxide-semiconductor Q1 is also through the 4th resistance R4 and
The output end of one amplifier U1 couples.The output end of the first amplifier U1 is also coupled with the preprocessing module 152.This
Outside, the second input terminal of the first amplifier U1 is also through the 5th resistance R5 ground connection.The first power end of first amplifier U1 with+
5V power supplys connect, second source end ground connection.
Wherein, metal-oxide-semiconductor Q1 is the input stage of amplifier, to improve input impedance, and CZT detector 13 is exported
Signal is amplified.Among the above through the second capacitance C2 be feedback capacity, the 4th resistance R4 be feedback resistance, by adjusting C2,
R4 can change amplitude and pulse width.
Wherein it is preferred to the first input end of the first amplifier U1 can be in-phase input end, first amplification
The second input terminal of device U1 can be inverting input.The first power end of the first amplifier U1 is with phase power end, institute
The second source end for stating the first amplifier U1 is inverting power supplies end.
Wherein, the port HV in Fig. 3 is for connecing external high pressure power supply, wherein the external high voltage power supply can be down to 20-
100V, for powering for CZT detector 13.Port 1 in Fig. 3 with preprocessing module 152 for connecting.
The preprocessing module 152 is coupled with the pre-amplifying module 151 and the comparison module 153 respectively, is used for
The electric signal that the pre-amplifying module 151 exports is filtered, is shaped, is exported to comparison module 153 after enhanced processing.In
In the present embodiment, as shown in Figure 4, it is preferable that the preprocessing module 152 includes：Differential circuit 1521 and amplifying circuit 1522.
The differential circuit 1521 is coupled with the pre-amplifying module 151 and the amplifying circuit 1522 respectively, Yu Ben
In embodiment, it is preferable that the differential circuit 1521 is CR differential circuits.It is further excellent as shown in the left side dotted line frame in Fig. 4
Selection of land, the differential circuit 1521 include：Third capacitance C3 and the 6th resistance R6.One end of the third capacitance C3 be used for it is preposition
Amplification module 151 connects, and further, one end of the third capacitance C3 with first in pre-amplifying module 151 for putting
The output end connection of big device U1.The other end of the third capacitance C3 is through the 6th resistance R6 ground connection, in addition, the third capacitance C3
The other end also coupled with amplifying circuit 1522.The pulse signal exported through pre-amplifying module 151 is through the differential circuit 1521
Afterwards, gaussian signal exports subject to change, in addition, the differential circuit 1521, which can also filter out, is superimposed upon 13 output signal of CZT detector
In noise signal.
The amplifying circuit 1522 is coupled with the differential circuit 1521 and the comparison module 153 respectively, for will be through
Output is to comparison module 153 after the signal amplification that differential circuit 1521 exports.In this present embodiment, such as the right dotted line in Fig. 4
Shown in frame, it is preferable that the amplifying circuit 1522 includes：Second amplifier U2.The first input end of the second amplifier U2
Couple, further, the first input end of the second amplifier U2 and the third capacitance C3 with the differential circuit 1521
Other end connection and the second amplifier U2 first input end also through the 6th resistance R6 ground connection.In addition, described second
First input end of the first input end of amplifier U2 also through the 7th resistance R7 ground connection and the second amplifier U2 is also through the
Eight resistance R8 are connect with+5V power supplys.The second input terminal of the second amplifier U2 is coupled with its output end, further preferably
Second input terminal on ground, the second amplifier U2 is connect through the 9th resistance R9 with its output end.In addition, second amplifier
The second input terminal of U2 is also grounded, it is further preferred that the second input terminal of the second amplifier U2 is also through the tenth resistance R10
It is grounded with after the 4th capacitance C4 series connection.The output end of the second amplifier U2 is coupled with the comparison module 153, further
The output end on ground, second amplifier U2 is coupled through eleventh resistor R11 with the comparison module 153.Second amplifier U2's
First power end is connect with+5V power supplys, second source end ground connection.
Wherein it is preferred to the first input end of the second amplifier U2 can be in-phase input end, second amplification
The second input terminal of device U2 can be inverting input.The first power end of the second amplifier U2 is with phase power end, institute
The second source end for stating the second amplifier U2 is inverting power supplies end.
For being connect with the port 1 in Fig. 3, the port 3 in Fig. 4 is used for and comparison module 153 for port 2 in wherein Fig. 4
Connection.
The comparison module 153 is coupled with the preprocessing module 152 and processor 17 respectively, is used for the pretreatment
The signal for meeting preset standard in the electric signal that module 152 exports is exported to be handled to processor 17.In this present embodiment,
As shown in Figure 5, it is preferable that the comparison module 153 includes：Comparator U3.The first input end of the comparator U3 and reference
Voltage couples, it is further preferred that the first input end of the comparator U3 is connect through twelfth resistor R12 with reference voltage,
In addition, the first input end of the comparator U3 is also grounded through thirteenth resistor R13.The second input terminal of the comparator U3 with
The preprocessing module 152 couple, it is further preferred that the first input end of the comparator U3 through the 14th resistance R14 with
The preprocessing module 152 connects, in addition, the first input end of the comparator U3 is also through the 15th resistance R15 ground connection.It is described
Comparator U3 output ends are coupled with the processor 17, it is preferable that the output end of the comparator U3 and the 16th resistance R16 connect
It is coupled with the processor 17 after connecing.The first power end of the comparator U3 is connect with+5V power supplys, and the of the comparator U3
Two power ends are grounded.The quasi- gaussian signal that preprocessed module 152 exports exports square-wave signal after the screening of comparison module 153.
In addition, the analog signal that the comparison module 153 is additionally operable to receive is converted to digital signal output.
Wherein, which can set according to actual demand, in this present embodiment, it is preferable that the comparison module
The signal more than reference voltage in 153 electric signals for exporting preprocessing module 152 exports.Wherein, pre- bidding among the above
Standard is reference voltage, can be set according to actual demand, for example, in the present embodiment, set the reference voltage as+5V.
Wherein it is preferred to the first input end of the comparator U3 can be inverting input, the of the comparator U3
Two input terminals can be in-phase input end.The first power end of the comparator U3 be with phase power end, the comparator U3's
Second source end is inverting power supplies end.
Wherein, for being connect with the port 3 in Fig. 4, the port 5 in Fig. 5 is used to connect with processor 17 port 4 in Fig. 5
It connects.
The processor 17 is coupled with the signal processing system 15, is used for according to preset standard to the signal processing system
The electric signal of 15 output of system is pre-processed.Preferably, the processor 17 and 153 coupling of comparison module in signal processing system 15
It closes, further, is connect with the output end of the comparator U3 in comparison module 153.Processor 17 exports comparison module 153
Signal is handled according to preset standard, to reduce the output bias of the portable radiant dosemeter 10, especially in low dosage
Output bias under rate environment.Wherein, preset standard among the above refer to manager according to actual use demand according to default threshold
Value carries out sectional calibration processing to the signal that processor 17 receives.
In order to more clearly illustrate the principle of preset standard, only with the case where two predetermined threshold values illustrate below
Bright, the case where remaining predetermined threshold value, is similar therewith, no longer burdensome herein.Preferably, when processor 17 receives comparison module 153
When the signal of output, the numerical value of the signal received is judged with first threshold, if the numerical value of the signal received is less than
First threshold then obtains dosage rate y1 according to the first default calibration factor and the signal value of acquisition.If the signal received
Numerical value is more than or equal to first threshold, then obtains dosage rate y2 according to the second default calibration factor and the signal value of acquisition.Its table
It is as follows up to formula：
Wherein, a, b are the first default calibration factor, and c, d are the second default calibration factor, and y is dosage rate, and x is processor
The numerical value of 17 signals received, as portable radiant dosemeter 10 are to X, gamma-ray response data.
As shown in fig. 6, after carrying out segment processing according to preset standard to the signal that comparison module 153 exports, this is portable
The output bias of dosimeter 10 becomes smaller, and especially at low dose rate, from original deviation 280%, is reduced to -12%.
Wherein, the deviation data before and after sectional calibration is as shown in table 1.
Table 1
From the data in table it is not difficult to find that after the signal progress segment processing that comparison module 153 exports so that this is portable
The output bias of dosimeter 10 becomes smaller, the significant effect especially at low dose rate.
Wherein a, b, c, d can be as obtained by Standard Ratio field calibration, for example, the portable radiant dosemeter 10 is placed in
One threshold value section (x<1000) in standard dose field, the portable radiant dosemeter 10 is tested under multigroup dosage rate to the sound of radiation
Data are answered, array (xi, yi) is obtained, are fitted to obtain coefficient a, b using least square line, expression formula is as follows：Yi=axi
+b。
The portable radiant dosemeter 10 is placed in the standard dose field of second threshold section (x >=1000), test is multigroup
The portable radiant dosemeter 10 obtains array (xi, yi) to the response data of radiation under dosage rate, straight using least square method
Line is fitted to obtain coefficient c, d, and expression formula is as follows：Yi=cxi+d.
Wherein, in order to make calibration factor a, b, c, d accurate as far as possible, the multigroup Different Dose Rates of test as much as possible are answered
The lower portable radiant dosemeter 10 is not less than 3 groups under normal conditions to the response data of radiation.
Wherein, it should be appreciated that the case where illustrating only the preset standard under two predetermined threshold values among the above may be used also
The case where to include multiple predetermined threshold values, for example, the first preset value is 100, second threshold 200, third preset value is 300
Deng it is thus impossible to the case where preset standard under two preset values shown in will be above-mentioned and the reasons such as the numerical value of predetermined threshold value
Solution is at being limitation of the present invention, and no matter how the numerical value of predetermined threshold value changes, and how many a predetermined threshold values of setting etc., as long as
Among its principle, it should be included within the scope of the present invention.
Wherein, above-mentioned processor 17 can be a kind of IC chip, the processing capacity with signal.Above-mentioned place
It can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit to manage device 17
(Network Processor, NP) etc.；Can also be digital signal processor (Digital Signal Processing,
DSP), application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate
Array (Field Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or crystal
Pipe logical device, discrete hardware components.General processor can be microprocessor or the processor 17 can also be any normal
Processor 17 of rule etc..For example, when the processor 17 selects STM32 microcontrollers, universal input/output of microcontroller
The port (General Purpose Input Output, referred to as GPIO) is connect with the output end of its comparator U3.
The embodiment of the present invention additionally provides a kind of dosage monitoring equipment 20, as shown in Figure 7.The dosage monitoring equipment 20 is wrapped
It includes：Control terminal 21 and above-mentioned portable radiant dosemeter 10, the control terminal 21 and the portable radiant dosemeter
Processor 17 in 10 couples.The control terminal 21 can be used for receiving the signal that processor 17 is sent, i.e. the portable radiant agent
Measure the dosage rate that instrument 10 exports.In addition, the control terminal 21 can also be according to actual needs in time to portable radiant agent
It measures instrument 10 and carries out data update, program update etc., for example, updating storage the preset standard etc. in processor 17.Wherein, above-mentioned
In control terminal 21 include but not limited to computer.
The embodiment of the present invention additionally provides a kind of segment processing method, which is applied to above-mentioned portable
In dosimeter 10.As shown in figure 8, the segment processing method includes step：S101-S102.
Step S101：It obtains to X, gamma-ray response data.
The response data can be obtained by dosimeter, for example, the dosimeter is placed in unknown radiance
In radiation field, it can obtain to X, gamma-ray response data.
Step S102：Judge whether the response data is less than the first preset value.
If the response data is less than the first preset value, step S103 is executed, if the response data is pre- not less than first
If value executes step S104.
Step S103：Dosage rate is obtained according to the first default calibration factor and the response data of acquisition.
The response data of acquisition is compared with the first preset value, is preset if the response data is less than first
Value then obtains dosage rate according to the first default calibration factor and the response data of acquisition.Preferably, if the number of responses
When according to less than the first preset value, then dosage rate is obtained according to formula y=ax+b, wherein y is dosage rate, and x is to obtain to X, γ
The response data of ray, a, b are the first default calibration factor.
Step S104：Dosage rate is obtained according to the second default calibration factor and the response data of acquisition.
If the response data is more than or equal to (being not less than) first preset value, according to the second default calibration factor and obtain
The response data obtained obtains dosage rate.Preferably, if the response data is not less than the first preset value, i.e., the described response
Data are more than or equal to the first preset value, then obtain dosage rate according to formula y=cx+d, wherein y is dosage rate, and x is pair obtained
X, gamma-ray response data, c, d are the second default calibration factor.
Wherein, first default calibration factor a, b, second default calibration factor c, d can as obtained by Standard Ratio field calibration,
Its method obtained is illustrated when the preset standard to processor 17 illustrates, is no longer introduced herein.
Wherein, either manager sets or divides according to actual needs for user for first preset value
Value, for example, the first preset value among the above can be set as 1000.It should be understood that the first preset value among the above is only
It is preferred example for the ease of understanding, can also be remaining numerical value, therefore cannot be understood as being to this
The limitation of invention.Further, it is also possible to multiple predetermined threshold values are set according to actual needs, for example, 500,1000,1500 etc., it is former
Reason is similar therewith.
In conclusion at an embodiment of the present invention provides a kind of portable radiant dosemeter and dosage monitoring equipment, segmentation
Reason method.The portable radiant dosemeter includes：CZT detector, signal processing system, processor and shielding case.Wherein, described
Signal processing system includes：Pre-amplifying module, preprocessing module and comparison module.Since the CZT detector is with higher
Atomic number, thus the thickness for detecting material can reach centimetres, to ensure that its outstanding detection efficient, in addition,
Also has the characteristics that energy resolution height, high sensitivity, small, light-weight.In addition, using signal processing system to described
The electric signal of CZT detector output is amplified, shapes, filtering, output is pre-processed to the processor after Screening Treatment,
So as to amplitude, the pulsewidth etc. for changing output signal, to improve the dosage of portable radiant dosemeter and dosage monitoring equipment
Linearly.Further, the pulse signal for the CZT detector output which is used to receive is amplified
Output is to the preprocessing module after processing；Through the pulse signal of pre-amplifying module output after the preprocessing module, become
Quasi- gaussian signal output, in addition, the preprocessing module can also filter out the noise letter being superimposed upon in CZT detector output signal
Number；The quasi- gaussian signal of preprocessed module output exports square-wave signal after comparison module screens.In addition, using processor pair
The signal of the comparison module output received is pre-processed, and ensure that the operating voltage of the CZT detector is being down to human body
When safe voltage, which still has higher detection efficient, can effectively reduce the portable radiant
The output bias of dosemeter makes its output bias become smaller, especially the significant effect in low dose rate.The shielding case not only may be used
To protect CZT detector disposed within, signal processing system and processor, its damage is avoided, to prolong the service life；And
CZT detector, signal processing system and processor can also be avoided to be interfered by external electromagnetic signal, to improve dose of radiation
The accuracy of rate.In addition, the present invention is also equipped with：The advantages that detection efficient is good, high sensitivity, small, strong antijamming capability.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in
Within protection scope of the present invention.
Claims (10)
1. a kind of portable radiant dosemeter, which is characterized in that including：CZT detector, signal processing system, processor and by
Shielding case made of metal material, the CZT detector, the signal processing system, processor coupling, the CZT are visited
Survey device, the signal processing system and the processor may be contained in the shielding case, the signal processing system for pair
The electric signal of the CZT detector output is amplified, shapes, being exported to the processor, the processor after Screening Treatment
Electric signal for being exported to the signal processing system according to preset standard pre-processes.
2. portable radiant dosemeter according to claim 1, which is characterized in that the signal processing system includes：Before
Set amplification module, preprocessing module and comparison module, the CZT detector, the pre-amplifying module, the pretreatment mould
Block, the comparison module and the processor couple successively；
The electric signal for the CZT detector output that the pre-amplifying module is used to receive exports after being amplified processing
To the preprocessing module；
The preprocessing module for the electric signal that the pre-amplifying module exports is formed, after enhanced processing output to
Comparison module；
The comparison module be used for by the signal for meeting preset standard in electric signal that the preprocessing module exports export to
The processor is handled.
3. portable radiant dosemeter according to claim 2, which is characterized in that the pre-amplifying module includes：MOS
Pipe and the first amplifier, the source electrode of the metal-oxide-semiconductor are grounded, the drain of the metal-oxide-semiconductor respectively with first amplifier first
Input terminal and the coupling of the second input terminal, the grid of the metal-oxide-semiconductor are defeated with the CZT detector and first amplifier respectively
Outlet couples, and the output end of first amplifier is also coupled with the preprocessing module.
4. portable radiant dosemeter according to claim 2, which is characterized in that the preprocessing module includes：Differential
Circuit and amplifying circuit, the differential circuit are coupled with the pre-amplifying module and the amplifying circuit respectively, the amplification
Circuit is coupled with the comparison module；
Output is put to described after the differential circuit is used to the electric signal that the pre-amplifying module exports processing is formed
Big circuit；
Output is to comparison module after the amplifying circuit is used to the electric signal that the differential circuit exports being amplified processing.
5. portable radiant dosemeter according to claim 4, which is characterized in that the differential circuit is CR differential electricity
Road.
6. portable radiant dosemeter according to claim 4, which is characterized in that the amplifying circuit includes：Second puts
The first input end of big device, second amplifier is coupled with the differential circuit, the second input terminal of second amplifier
It being coupled with its output end, the output end of second amplifier is coupled with the comparison module, and the second of second amplifier
Input terminal is also grounded.
7. portable radiant dosemeter according to claim 2, which is characterized in that the comparison module includes：Comparator,
The first input end of the comparator is coupled with reference voltage, the second input terminal of the comparator and the preprocessing module coupling
It closes, the output end of the comparator is coupled with the processor.
8. a kind of dosage monitoring equipment, which is characterized in that including：Control terminal and as described in claim 1-7 any one
Portable radiant dosemeter, the control terminal are coupled with the processor in the portable radiant dosemeter.
9. a kind of segment processing method, which is characterized in that the method is applied to as described in claim 1-7 any one
In portable radiant dosemeter, the method includes：
It obtains to X, gamma-ray response data；
Judge whether the response data is less than the first preset value, if the response data is less than the first preset value, according to the
One default calibration factor and the response data of acquisition obtain dosage rate, are preset if the response data is more than or equal to first
Value then obtains dosage rate according to the second default calibration factor and the response data of acquisition.
10. segment processing method according to claim 9, which is characterized in that the response data by acquisition
Be compared with the first preset value, if the response data is less than the first preset value, according to the first default calibration factor and
The response data obtained obtains dosage rate, default according to second if the response data is more than or equal to the first preset value
Calibration factor and the response data of acquisition obtain the step of dosage rate and include：
The response data of acquisition is compared with the first preset value, if the response data is less than the first preset value,
Dosage rate is obtained according to formula y=ax+b, if the response data is more than or equal to the first preset value, according to formula y=cx+d
Obtain dosage rate, wherein y is dosage rate, and x is to obtain to X, gamma-ray response data, and a, b are the first default calibration system
Number, c, d are the second default calibration factor, and a, b, c, d can be as obtained by Standard Ratio field calibration.
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