CN105676257B - Radioactive activity detection device and its detection method in the mobile solid of miniaturization, liquid substance - Google Patents
Radioactive activity detection device and its detection method in the mobile solid of miniaturization, liquid substance Download PDFInfo
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- CN105676257B CN105676257B CN201610073455.5A CN201610073455A CN105676257B CN 105676257 B CN105676257 B CN 105676257B CN 201610073455 A CN201610073455 A CN 201610073455A CN 105676257 B CN105676257 B CN 105676257B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/17—Circuit arrangements not adapted to a particular type of detector
- G01T1/178—Circuit arrangements not adapted to a particular type of detector for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water
Abstract
The present invention provides a kind of mobile solid of miniaturization, radioactive activity detection device and its detection method in liquid substance, and device includes cabinet, the measuring chamber being fixed in cabinet, is set to the display screen on cabinet surface, and is set to the measuring circuit of cabinet inside；Wherein measuring chamber and display screen are to be arranged in parallel；Display screen is connected with measuring circuit；Measuring chamber includes tungsten alloy lid, tungsten alloy shielding tank body, specimen cup and probe；Tungsten alloy lid is divided into left cover and right cover, and one end of left cover and right cover is to be flexibly connected, and the other end is moving rotary open end.Measuring circuit includes high voltage power supply, Current amplifier and shaping circuit, voltage discriminator, counter circuit, processor circuit, multichannel adjustable voltage reference circuit, key, display circuit；The present invention using integrated flat structure design, small in size, center of gravity bottom, uncap it is convenient and safe, place it is steady, rollover, the design of specimen cup preventing water leakage will not occur, can be suitble to the occasion of jolting such as vehicle, ship to use.
Description
Technical field
The present invention relates to detection Technology for Radioactive Substances field, especially a kind of miniaturization mobile solid, liquid substance
Middle radioactive activity detection device and its detection method.
Background technique
With the development of nuclear technology, nuclear energy in military and national economy various industries using increasingly extensive, nuclear energy exists
Promote the well-being of mankind while, also posed a great threat to the health of the mankind.It is had once there is nuclear accident, nuclear explosion a large amount of
Radioactive substance releases, and forms active fall-out, pollutes ambient enviroment, directly injures grain, meat, vegetables, water
The safety of fruit, drinking water, milk, beverage etc..Therefore, how to realize at the scene it is quick, conveniently, efficient detection goes out in test substance
Radioactive activity, accurately make radioactive pollution safety evaluatio, be nuclear emergency site disposal urgent problem to be solved.
Currently, the domestic radioactive activity detection in some solids and liquid substance generallys use radiochemical analysis side
Method and gamma-ray spectrometry analysis method, although measurement accuracy with higher, Monitoring lower-cut are low for both measurement methods.But
Such measurement method is required in the instrument and equipment for testing indoor large size, such as HpGe gamma spectrum analysis system；Low local α, β
Measuring device realizes that detecting instrument is heavy, the shielding vitriol chamber of use weigh several hundred kilograms, operation sample preparation is complicated, analytical cycle
Long, equipment cost height can not solve the radioactive activity detection problem in the test substance of nuclear pollution scene.
Although portable water, food radiacmeter can be used at present at nuclear pollution scene, because it uses straight tube knot
Structure, handle and lid are topmost, and using lead metal as shielding also in top half, lower half portion is its light for sample detection room
Electric multiplier tube and circuit system；The structure of top heavy is very unstable, and single unit system gravity center instability is easy rollover, can not be suitable for
The motion carriers platform such as vehicle, ship, and handle and lid weight are very heavy, testing staff, which takes, to be mentioned very inconvenient, and risk is big.
Therefore, for nuclear pollution scene provide a kind of miniaturization it is mobile quickly, conveniently, efficiently, the radiation of the pollutant of safety
Property activity detection device become inevitable.
Summary of the invention
The purpose of the present invention is to provide radioactive activity detection dresses in a kind of mobile solid of miniaturization, liquid substance
It sets, can not only conveniently, accurately measure the radioactive pollution situation of solid and liquid, and volume is smaller easy to carry, stablizes
Situations such as property will not more preferably turn on one's side.The miniaturization movable solid is utilized another object of the present invention is to provide a kind of
The detection method of radioactive activity detection device in body, liquid substance.
In order to solve the above technical problems, the present invention first have to change be detection device integral layout, change top-bottom layout
For left-right layout, sample detection room is placed on to the left side of equipment, circuit system and display system are placed on to the right side of equipment；Its
Secondary, since NaI crystal volume size determines the precision of detection, the present invention is on the basis of integrally increasing NaI crystal volume
The size of photomultiplier tube is reduced as far as possible, to reduce the height of detection device, NaI crystal is made into cylindrical body, rotary table combines
Structure allows crystal light-emitting surface diameter to become smaller, and is to improve signal in order to allow crystal preferably to cooperate with photomultiplier tube photocathode and receive
Collect efficiency；The last present invention is shielded using tungsten alloy to replace traditional lead screen, to reduce the thickness and weight of equipment.
The first aspect of the present invention provides a kind of mobile solid of miniaturization, radioactive activity detection in liquid substance
Device, comprising: cabinet the measuring chamber being fixed in cabinet, is set to the display screen on cabinet surface, and is set to cabinet inside
Measuring circuit；Wherein: measuring chamber and display screen are to be arranged in parallel；Display screen is connected with measuring circuit；
Measuring chamber includes: that tungsten alloy lid, tungsten alloy shielding tank body, specimen cup and probe, specimen cup are set to tungsten alloy screen
Tank interior is covered, probe is set to specimen cup bottom；Tungsten alloy lid is divided into left cover and right cover, and one end of left cover and right cover is activity
Connection, the other end are moving rotary open end；Probe is connected by cable with measuring circuit.
The probe includes: NaI crystal, photomultiplier tube, electro-magnetic shielding cover, probe outer cover and probe mounting ring, light
Electric multiplier tube is located at the lower section of NaI crystal, and the outside of NaI crystal and photomultiplier tube sets electro-magnetic shielding cover, electro-magnetic shielding cover
Outside is probe outer cover, and probe outer cover is equipped with probe mounting ring.
The NaI crystal, top are cylindrical body, and lower section is inverted rotary table；The big circular bottom surface and cylindrical body contract of rotary table
It closes, small circular bottom surface and the photomultiplier tube of rotary table agree with；Namely the longitudinal section of NaI crystal by rectangle and it is trapezoidal form, and rectangle
Width it is equal with trapezoidal long side.
The specimen cup includes: the cup body matched, cup lid and the waterproof grommet being set on cup lid.
The flexible connection of the left cover and right cover of the tungsten alloy lid is realized by sliding bearing.
The outside of the tungsten alloy lid is equipped with lid backing pin；
The top of the moving rotary open end of the tungsten alloy lid is equipped with handle of uncapping.
It is equipped with side outside the cabinet and transports stubborn hand, the side, which transports, twists hand as front and back setting, facilitates removing for detection device
Fortune.
Preferably, the top diameter of the NaI crystal is 40-50mm (optimal is 44mm), base diameter 25-30mm
(optimal is 27mm), total length is 55-65mm (optimal is 59mm).
Since tungsten alloy lid of the invention is divided into left cover and right cover, left and right lid is moving rotary structure, avoid lid because
Weight is heavy and is difficult to the problem of opening；And the top of moving rotary open end is equipped with handle of uncapping, and is conducive to uncap；Lid is cooperated
Backing pin makes lid be unlikely to automatically turn on；The overall volume of NaI crystal of the invention increases, improve detectivity volume and
The bottom of NaI crystal uses frustum cone structure, and NaI crystal bottom is exactly matched with photomultiplier tube, photomultiplier tube energy
Receive the detection signal of NaI crystal completely, while the volume energy of photomultiplier tube becomes smaller and detects entire detection device increasing
Volume is smaller while sensitivity；In addition, screened room of the invention uses tungsten alloy, so that the thickness of screened room is by original lead shield
The 25mm for covering room is reduced to 12mm, is constantly shrinking, and alleviates weight；Most of all, measuring chamber and display screen of the invention
It is arranged in parallel for left and right, reduces the height of detection device, increase the stability of detection device.
Present invention miniaturization is portable, can be moved easily realization detection at pollution scene, and due to its stability height, will not
Rollover is very suitable for vehicle-mounted, boat-carrying detection.
The second aspect of the present invention, provide a kind of solid, in liquid substance radioactive activity detection method, the detection
Method is detected using radioactive activity detection device in the mobile solid of miniaturization as described above, liquid substance.
The detection method comprises the following steps:
A, tested substance is placed in specimen cup；
B, the left cover and right cover of tungsten alloy lid is unscrewed, specimen cup is put into the tungsten alloy cask flask body of measuring chamber, is made
Probe is located at specimen cup bottom, and tungsten alloy lid is rotating closed；
C, gamma ray gets to probe NaI crystal in sample, makes NaI crystallo-luminescence, and photon passes through photomultiplier tube
Output is current impulse after amplification, the current impulse handles and carries out counting statistics by measuring circuit, calculates sample to be tested
Activity, finally show testing result on a display screen.
In the step C, current impulse amplification shaping circuit amplifies and is shaped to the voltage pulse of positive polarity, the voltage
Pulse is sent to 5 discriminators of rear class and carries out examination comparison, and when voltage pulse amplitude is higher than discriminator threshold voltage, discriminator is defeated
Negative pulse signal out, the negative pulse signal are sent to counter circuit and carry out counting statistics；Since sample radioactivity is living
Degree is directly proportional with counting rate, and single-chip microcontroller reads the count value in 5 channels, can calculate sample to be tested by direct proportion operation
Activity；In 5 discriminators, one is used as total batching counter, for measuring gross activity intensity in sample, in addition 4 examinations
Device constitutes two single-channel analyzers, while analyzing two kinds of radionuclide specific activities.
In the step C, it is preferred that handled using single track spectrum stabilization:
3 discriminators are selected in 5 discriminators, it is Va, Vb, Vm that threshold voltage, which is respectively set,.Sample is measured, and is recorded
3 discriminator outputs count Na, Nm, Nb.
Left half peak area are as follows: Nam=Na-Nm；
Right half peak area are as follows: Nmb=Nm-Nb；
When measuring system, environmental weather conditions are stablized, left half peak area is with half peak area ratio K0=Nam0/Nmb0 of the right side
One constant, and be recorded in the microprocessor, wherein left half peak area when Nam0 is measuring system, environmental weather conditions are stablized,
Right half peak area when Nmb0 is measuring system, environmental weather conditions are stablized；
When executing spectrum stabilization operation, sample is first measured, calculates K, works as K > K0, indicates that peak position is relatively low, microprocessor increases high
Voltage source voltage, it is on the contrary then reduce high-voltage power voltage；
After microprocessor automatic repeated several times spectrum stabilization operation, can will spectral peak position be stabilized to setting value allowed band it
It is interior.
In above-mentioned detection method, limited after step B tungsten alloy lid is rotating closed by lid backing pin.
It in measuring circuit, has been also equipped with " single track spectrum stabilization " function, can have been eliminated because of weather conditions such as environment temperature, barometric pressure humidities
Measuring system energy Frequency bias bring measurement error caused by changing guarantees the accurate, stable of testing result.
Radioactive activity detection device and detection method in miniaturization movable type solid of the invention, liquid substance, inspection
It surveys that range is wide, the solids such as soil, grain, veterinary antibiotics, meat, water, milk, cosmetics, the radiation in liquid substance can be detected
Property activity；And detection device minimizes, is portable, can be moved easily realization detection at pollution scene, and due to its stability
Height will not turn on one's side and be very suitable for vehicle-mounted, boat-carrying detection；The accuracy of detection is also higher.
Detailed description of the invention
Fig. 1 is constitutional diagram of the invention；
Fig. 2 is top view of the invention；
Fig. 3 is sectional view of the invention；
Fig. 4 is the structure chart of probe；
Fig. 5 is the structure chart of NaI crystal；
Fig. 6 is the constitutional diagram of specimen cup；
Fig. 7 is the cross-sectional view of specimen cup；
Fig. 8 is measuring circuit functional block diagram；
Fig. 9 is radioactive isotope CS-137 energy spectrum diagram
Appended drawing reference:
Measuring chamber 1；Display screen 2；Cabinet 3；
Specimen cup 4: cup body 41, cup lid 42, waterproof grommet 43；
Tungsten alloy shields tank body 5；It uncaps handle 6；Tungsten alloy lid 7；Sliding bearing 8；
Probe 9:NaI crystal 91, photomultiplier tube 92, electro-magnetic shielding cover 93, probe outer cover 94, probe mounting ring 95；
Lid backing pin 10, side, which transport, twists hand 11, measuring circuit 12；
High voltage power supply 1201, amplification shaping circuit 1202, discriminator circuit 1203~1207, pulse-scaling circuit 1208,
Multichannel adjustable voltage benchmark 1209, microprocessor 1210, LCD output interface 1211, key 1212.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2 and Figure 3, the present invention provides radioactivity in a kind of mobile solid of miniaturization, liquid substance
Activity detection device, comprising: cabinet 3, the measuring chamber 1 being fixed in cabinet, the display screen 2 for being set to cabinet surface, and setting
In the measuring circuit 12 of cabinet inside；Wherein: measuring chamber 1 and display screen 2 are to be arranged in parallel；Display screen 2 is connected with measuring circuit；
Measuring chamber includes: that tungsten alloy lid 7, tungsten alloy shielding tank body 5, specimen cup 4 and probe 9, specimen cup are set to tungsten conjunction
Inside gold shielding tank body 5, probe 9 is set to 4 bottom of specimen cup；Tungsten alloy lid 7 divides for left cover and right cover, and the one of left cover and right cover
To be flexibly connected, the other end is moving rotary open end at end；Probe 9 is connected by cable with measuring circuit.
As shown in figure 4, the probe 9 includes: NaI crystal 91, photomultiplier tube 92, electro-magnetic shielding cover 93, pops one's head in outside
Cover 94 and probe mounting ring 95, photomultiplier tube are located at the lower section of NaI crystal, and the outside of NaI crystal and photomultiplier tube sets electricity
Magnetic shielding cover 93, the outside of electro-magnetic shielding cover 93 are probe outer cover 94, and probe outer cover 94 is equipped with probe mounting ring 95.
As shown in figure 5, the NaI crystal 91, top is cylindrical body, and lower section is inverted rotary table；The big round bottom of rotary table
Face is agreed with cylindrical body, and the small circular bottom surface of rotary table is NaI crystal light-emitting surface, and light-emitting surface agrees with photomultiplier tube；Namely NaI is brilliant
The longitudinal section of body by rectangle and it is trapezoidal form, and rectangle width it is equal with trapezoidal long side.Preferably, the NaI crystal
The width of top diameter -- rectangle is 44mm, and base diameter -- trapezoidal short side is 27mm, total length 59mm.
As shown in Figure 6, Figure 7, the specimen cup 4 includes: the cup body 41 matched, cup lid 42 and is set on cup lid
Waterproof grommet 43.
As shown in figure 8, measuring circuit include: high voltage power supply 1201, amplification shaping circuit 1202, discriminator circuit 1203~
1207, pulse-scaling circuit 1208, multichannel adjustable voltage benchmark 1209, microprocessor 1210, LCD output interface 1211, key
1212。
As shown in figure 8, the one of discriminator 1203 of 5 discriminator circuits constitutes total road, 1204~1205 structure of discriminator
At a single track；Discriminator 1206~1207 constitutes a single track, and 1 road Ge Zong, 2 single tracks are realized to radioactivity in sample to be tested
Total amount measures simultaneously with 2 kinds of radioactive isotopes.
The flexible connection of the left cover and right cover of the tungsten alloy lid 7 is realized by sliding bearing 8.
The outside of the tungsten alloy lid 7 is equipped with lid backing pin 10；
The top of the moving rotary open end of the tungsten alloy lid 7 is equipped with handle 6 of uncapping.
It is equipped with side outside the cabinet 3 and transports stubborn hand 11.
When detecting, tested substance is placed in specimen cup 4 by the present invention, and the left cover and right cover of tungsten alloy lid 7 is unscrewed,
Specimen cup 4 is put into measuring chamber 2, tungsten alloy lid 7 is rotating closed and is limited by lid backing pin 10；The letter that NaI crystal 91 detects
Number amplify via photomultiplier tube 92 and be transmitted to measuring circuit, after amplification shaping circuit 1202 is handled after, send discriminator electric
Road 1203~1207 carries out voltage amplitude examination, discriminator output counts pulse and counter circuit 1208 is sent to carry out counting statistics,
Microprocessor 1210 reads after counter counts and calculates sample radioactivity tale, with 2 nuclide channel characteristic energy sections
Intensity counts, which can be obtained radioactive activity as a result, measurement result send LCD display 1211 to carry out multiplied by calibration factor
Display.Wherein high voltage power supply 1201 provides bias voltage for photomultiplier tube dynode.
As Fig. 9 be a typical case Cs-137NaI energy spectrum diagram, Vm be Cs-137 661KeV characteristic energy peak, threshold value Va, Vb it
Between count nabFor CS-137 661KeV peak area.When environmental weather conditions change, due to NaI scintillator, photomultiplier transit
Temperature drift can occur for pipe and other electronic circuits, and deviation occurs in the peak area that measurement same sample will appear record, from
And cause the deviation of final measurement.The purpose of single track spectrum stabilization is exactly, when power spectrum sends and drifts about, by adjusting measuring circuit
In high voltage power supply or amplifier magnification ratio, the peak position of power spectrum is readjusted into setting value.
3 discriminators are selected in 5 discriminators, it is Va, Vb, Vm that threshold voltage, which is respectively set,.Measure Cs-137 standard
Sample, and record 3 discriminator outputs and count Na, Nm, Nb.
Left half peak area are as follows: Nam=Na-Nm；
Right half peak area are as follows: Nmb=Nm-Nb
When measuring system, environmental weather conditions are stablized, left half peak area is with half peak area ratio K0=Nam0/Nmb0 of the right side
One constant, and be recorded in the microprocessor, wherein left half peak area when Nam0 is measuring system, environmental weather conditions are stablized,
Right half peak area when Nmb0 is measuring system, environmental weather conditions are stablized；
When executing spectrum stabilization operation, Cs-137 standard sample is first measured, calculates K, works as K > K0, indicates that peak position is relatively low, micro- place
It manages device and increases 1201 voltage of high voltage power supply, it is on the contrary then reduce by 1201 voltage of high voltage power supply.
After microprocessor automatic repeated several times spectrum stabilization operation, can will spectral peak position be stabilized to setting value allowed band it
It is interior.
The preferred embodiment of the present invention has been described in detail above, but the invention be not limited to it is described
Embodiment, those skilled in the art can also make various etc. on the premise of not violating the inventive spirit of the present invention
Same variation or replacement, these equivalent modifications or replacement are all included in the scope defined by the claims of the present application.
Claims (11)
1. radioactive activity detection method in a kind of mobile solid of miniaturization, liquid substance, which is characterized in that the detection
Method the following steps are included:
A, tested substance is placed in specimen cup；
B, the left cover and right cover of tungsten alloy lid is unscrewed, specimen cup is put into the tungsten alloy cask flask body of measuring chamber, makes to pop one's head in
Positioned at specimen cup bottom, tungsten alloy lid is rotating closed；
C, gamma ray gets to probe NaI crystal in sample, makes NaI crystallo-luminescence, and photon amplifies by photomultiplier tube
Output is current impulse afterwards, the work that measuring circuit handles and carries out counting statistics, calculates sample to be tested is passed through in the current impulse
Degree, finally shows testing result on a display screen；
In the step C, the voltage pulse of positive polarity, the electricity are amplified through Current amplifier shaping circuit and are shaped in current impulse
Pressure pulse is sent to 5 discriminators of rear class and carries out examination comparison, when voltage pulse amplitude is higher than discriminator threshold voltage, discriminator
Output negative pole pulse signal, the negative pulse signal are sent to counter circuit and carry out counting statistics；
Since sample radioactivity activity and counting rate are directly proportional, single-chip microcontroller reads the count value in 5 channels, is transported by direct proportion
Calculate the activity that can calculate sample to be tested；
In 5 discriminators, one is used as total batching counter, for measuring gross activity intensity in sample, in addition 4 discriminator structures
It is analyzed at two single-channel analyzers, while to two kinds of radionuclide specific activities；
The detection method is detected using radioactive activity detection device in the mobile solid of miniaturization, liquid substance,
The detection device includes:
Cabinet, is set to the display screen on cabinet surface at the measuring chamber being fixed in cabinet, and is set to the measurement electricity of cabinet inside
Road；
Wherein: measuring chamber and display screen are to be arranged in parallel；
Display screen is connected with measuring circuit；
Measuring chamber includes: that tungsten alloy lid, tungsten alloy shielding tank body, specimen cup and probe, specimen cup are placed in tungsten alloy cask flask
Internal portion, probe are set to specimen cup bottom；
Tungsten alloy lid is divided into left cover and right cover, and one end of left cover and right cover is to be flexibly connected, and the other end is moving rotary open end；
Probe is connected by cable with measuring circuit；
Measuring circuit include: high voltage power supply, Current amplifier shaping circuit, voltage discriminator, counter circuit, processor circuit,
Multichannel adjustable voltage reference circuit, key, display circuit.
2. radioactive activity detection method in a kind of miniaturization movable type solid according to claim 1, liquid substance,
It is characterized in that, the probe includes: NaI crystal, photomultiplier tube, electro-magnetic shielding cover, probe outer cover and probe mounting ring, light
Electric multiplier tube is located at the lower section of NaI crystal, and the outside of NaI crystal and photomultiplier tube sets electro-magnetic shielding cover, electro-magnetic shielding cover
Outside is probe outer cover, and probe outer cover is equipped with probe mounting ring.
3. radioactive activity detection method in a kind of miniaturization movable type solid according to claim 2, liquid substance,
It is characterized in that, the NaI crystal is composed of the inverted rotary table of upper cylindrical body and lower section, wherein the big circular bottom surface of rotary table
Agree with cylindrical body.
4. radioactive activity detection side in a kind of miniaturization movable type solid according to claim 1,2 or 3, liquid substance
Method, which is characterized in that the specimen cup includes: the cup body matched, cup lid and the waterproof grommet being set on cup lid.
5. radioactive activity detection side in a kind of miniaturization movable type solid according to claim 1,2 or 3, liquid substance
Method, which is characterized in that the flexible connection of the left cover and right cover of the tungsten alloy lid is sliding bearing.
6. radioactive activity detection side in a kind of miniaturization movable type solid according to claim 1,2 or 3, liquid substance
Method, which is characterized in that the outside of the tungsten alloy lid is equipped with lid backing pin.
7. radioactive activity detection side in a kind of miniaturization movable type solid according to claim 1,2 or 3, liquid substance
Method, which is characterized in that the top of the moving rotary open end of the tungsten alloy lid is equipped with handle of uncapping.
8. radioactive activity detection side in a kind of miniaturization movable type solid according to claim 1,2 or 3, liquid substance
Method, which is characterized in that be equipped with side outside the cabinet and transport stubborn hand.
9. radioactive activity detection method in a kind of miniaturization movable type solid according to claim 3, liquid substance,
It is characterized in that, the top diameter of the NaI crystal is 40-50mm, base diameter 25-30mm, total length 55-65mm.
10. radioactive activity detection method in a kind of miniaturization movable type solid according to claim 9, liquid substance,
It is characterized in that, the top diameter of the NaI crystal is 44mm, base diameter 27mm, total length 59mm.
11. the detection side of radioactive activity in a kind of miniaturization movable type solid according to claim 1, liquid substance
Method, which is characterized in that handled in the step C using single track spectrum stabilization:
3 discriminators are selected in 5 discriminators, it is Va, Vb, Vm that threshold voltage, which is respectively set, measures sample, and record 3
Discriminator output counts Na, Nm, Nb, left half peak area are as follows: Nam=Na-Nm；Right half peak area are as follows: Nmb=Nm-Nb；
When measuring system, environmental weather conditions are stablized, left half peak area and half peak area ratio K0=Nam0/Nmb0 of the right side are one normal
Number, and be recorded in the microprocessor, wherein left half peak area, Nmb0 when Nam0 is measuring system, environmental weather conditions are stablized
Right half peak area when stablizing for measuring system, environmental weather conditions；
When executing spectrum stabilization operation, sample is first measured, calculates K=Nam/Nmb, works as K > K0, indicates that peak position is relatively low, microprocessor liter
High high-voltage power voltage, it is on the contrary then reduce high-voltage power voltage；
After microprocessor automatic repeated several times spectrum stabilization operation, can will spectral peak position be stabilized within setting value allowed band.
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| CN111965687B (en) * | 2020-08-26 | 2022-08-05 | 山西医科大学 | Activity detection station |
| CN112612049A (en) * | 2020-12-04 | 2021-04-06 | 中广核久源（成都）科技有限公司 | Distance-adjustable vacuum radioactivity detection device and detection method |
| CN113484896A (en) * | 2021-07-01 | 2021-10-08 | 成都纽瑞特医疗科技股份有限公司 | Radioactive substance detection device |
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