CN209132433U - A kind of α, beta activity Measurement of surface contamination circuit - Google Patents
A kind of α, beta activity Measurement of surface contamination circuit Download PDFInfo
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- CN209132433U CN209132433U CN201821881714.8U CN201821881714U CN209132433U CN 209132433 U CN209132433 U CN 209132433U CN 201821881714 U CN201821881714 U CN 201821881714U CN 209132433 U CN209132433 U CN 209132433U
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Abstract
The utility model discloses a kind of α, beta activity Measurement of surface contamination circuit, including detector, driving circuit, first order amplifying circuit, second level amplifying circuit, main amplifier, monostable wave-shaping circuit and the comparator circuit successively to connect, the comparator circuit includes counting the first comparator circuit of pulse for screening α and counting the second comparator circuit of pulse for screening β, and the signal input part of the first comparator circuit and second comparator circuit is connect with the signal output end of the monostable wave-shaping circuit.The utility model circuit design is reasonable, pre-amplification is carried out to the small-signal exported from detector using first order amplifying circuit and second level amplifying circuit, main amplifier is recycled to amplify again and be maintained at certain amplitude, to meet the judgement of follow-up data and the processing of signal, α, which is screened out, by first comparator circuit counts pulse, β is screened out by the second comparator circuit and counts pulse, and noise is low, low in energy consumption.
Description
Technical field
The utility model belongs to radiation dose measurement field, and in particular to a kind of α, beta activity Measurement of surface contamination circuit.
Background technique
With the propulsion that nuclear energy peace develops and uses, from uranium mining, ore processing, uranium it is exquisite to nuclear fuel element system
Make and nuclear energy power generation during, all may relate to the production and operation of various radioactive substances, these radioactive substances
In production with operating process, radioactive particulate substance may be generated and disperse forms radioaerosol in air；Or
Person, radioactive particulate matter or volatile matter are attached to staff's body surface or other body surfaces, form body surface pollution.Cause
This, Radiation monitoring is to protect practitioner and its public from the basis of additional ionization radiation irradiation, in the safety of radioactive source
Using, find lose radioactive source, determine radioactive source breakage pollution degree and range and the public and staff suffered by spoke
The estimation aspect etc. for penetrating dosage, has irreplaceable role.With increasing for nuclear power unit, surface monitoring works not
Disconnected to reinforce, the demand to Nuclear Instrument is gradually increased, and is also continuously improved and is promoted in terms of the measurement of radioactive surface contamination, α, β table
Face measuring contamination instrument has a wide range of applications as a kind of radiation dose monitoring quasi-instrument.In addition, domestic at present radiate in α, β
Property Measurement of surface contamination circuit in terms of there is also certain defects and deficiency.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiency of the prior art, provide a kind of α,
Beta activity Measurement of surface contamination circuit, it is micro- to what is exported from detector using first order amplifying circuit and second level amplifying circuit
Weak signal carries out pre-amplification, recycles main amplifier to amplify and be maintained at certain amplitude again, to meet sentencing for follow-up data
Certainly with the processing of signal, α is screened out by first comparator circuit and counts pulse, β meter is screened out by the second comparator circuit
Rapid pulse punching, noise is low, low in energy consumption, and functional reliability is high, convenient for promoting the use of.
In order to solve the above technical problems, the technical solution adopted in the utility model is: a kind of α, beta activity surface contamination are surveyed
Measure circuit, it is characterised in that: including detector, driving circuit, first order amplifying circuit, the second level amplification electricity successively to connect
Road, main amplifier, monostable wave-shaping circuit and comparator circuit, the comparator circuit include counting pulse for screening α
First comparator circuit and the second comparator circuit that pulse is counted for screening β, the first comparator circuit and described the
The signal input part of two comparator circuits is connect with the signal output end of the monostable wave-shaping circuit.
A kind of above-mentioned α, beta activity Measurement of surface contamination circuit, it is characterised in that: the detector is air-holding type direct ratio
Counter LND4313.
A kind of above-mentioned α, beta activity Measurement of surface contamination circuit, it is characterised in that: the driving circuit includes model
The drain electrode of the technotron VT1, the technotron VT1 of 3DJ8H connect through resistance R3 and resistance R2 and+12V power supply
It connects；The grid of the technotron VT1 after capacitor C8, resistance R8 and capacitor C7 with the signal output end phase of detector
It connects；The source electrode of the technotron VT1 divides two-way, connect all the way through resistance R11 with -12V power supply, and another way is through parallel connection
Capacitor C14 and capacitor C15 ground connection.
A kind of above-mentioned α, beta activity Measurement of surface contamination circuit, it is characterised in that: the first order amplifying circuit includes
Amplifier LF357BN, the 7th pin of the amplifier LF357BN are connect with+12V power supply, and the amplifier LF357BN's is anti-
Phase input terminal is grounded through resistance R14, the leakage of the non-inverting input terminal of the amplifier LF357BN and the technotron VT1
Pole connection, the 6th pin of the amplifier LF357BN divide two-way, put after resistance R9 and capacitor C12 in parallel with described all the way
The inverting input terminal of big device LF357BN is connected, and another way connects one end of resistance R4；The other end of the resistance R4 is divided to two
Road is all the way the signal output end of first order amplifying circuit, and another way is through resistance R18 and capacitor C18 in parallel and the junction type
The grid of field-effect tube VT1 connects, and the 4th pin of the amplifier LF357BN divides two-way, connect all the way with -12V power supply, separately
It is grounded after capacitor C16 all the way；
The second level amplifying circuit includes amplifier LM318N, the anti-phase input terminating resistor of the amplifier LM318N
The other end of one end of R10, the resistance R10 divides two-way, is grounded all the way through capacitor C11 and resistance R6, another way is through resistance R12
Ground connection；The non-inverting input terminal of the amplifier LM318N divides two-way, and the sliding end all the way through resistance R15 and swept resistance R19 connects
It connects, another way is grounded through resistance R16, and three tunnels of the 4th pin point of the amplifier LM318N are grounded after capacitor C19, separately all the way
Connection -12V power end all the way, third road are connect through swept resistance R19 with+12V power supply；Draw the 6th of the amplifier LM318N
Foot divides two-way, connects the inverting input terminal of the amplifier LM318N, another way connection through resistance R7 and capacitor C9 in parallel all the way
The other end of one end of capacitor C13, the capacitor C13 divides two-way, is grounded all the way through resistance R17, another way connecting interface P3's
3rd pin.
The measuring circuit of above-mentioned a kind of α, beta activity surface contamination, it is characterised in that: the main amplifier includes model
For the chip U15 of the chip U14 and model THS4281 of THS4281, the 2nd pin of the chip U14 is through resistance R43 and electricity
Holding C59 to connect with the 3rd pin of interface P3, the 3rd pin of the chip U14 is grounded through resistance R46, and the 7th of the chip U14 the
Pin is connect with+5V power supply, and the 6th pin of the chip U14 divides two-way, and all the way through the resistance R39 and chip U14 the 2nd
Pin connects, and another way is connect through resistance R44 with the 3rd pin of the chip U15；The 2nd pin of the chip U15 is through resistance
R40 ground connection, the 7th pin of another way, the chip U15 are connect with+5V power supply, and the 6th pin of the chip U15 divides two-way,
It is connect all the way through resistance R41 with the 2nd pin of the chip U15, another way is connect with one end of capacitor C60, and capacitor C60's is another
Two-way is divided in one end, is grounded all the way through resistance R45, and another way is the signal output end of main amplifier.
A kind of above-mentioned α, beta activity Measurement of surface contamination circuit, it is characterised in that: the monostable wave-shaping circuit includes
Single channel comparator U10, the single channel comparator U12 and single channel comparator U13 of model TLV3201, the single channel ratio
The 3rd pin compared with device U10 is connect by resistance R23 with the sliding end of swept resistance R27, a fixing end of swept resistance R27
It is connect with+5V power supply, another fixing end ground connection of swept resistance R27, the 4th pin of the single channel comparator U10 passes through
The connection of the signal output end of resistance R24 and main amplifier；The 3rd pin of the single channel comparator U12 passes through resistance R33 and cunning
The sliding end connection of dynamic resistance R35, a fixing end of swept resistance R35 are connect with+5V power supply, and swept resistance R27's is another
4th pin of a fixing end ground connection, the single channel comparator U12 is connected by the signal output end of resistance R34 and main amplifier
It connects；The 3rd pin of the single channel comparator U13 is connect by resistance R38 with the sliding end of swept resistance R101, swept resistance
A fixing end of R101 is connect with+5V power supply, another fixing end ground connection of swept resistance R101, the single channel comparator
The 4th pin of U13 is connected by the signal output end of resistance R42 and main amplifier.
A kind of above-mentioned α, beta activity Measurement of surface contamination circuit, it is characterised in that: the first comparator circuit includes
The multivibrator U9 of model CD74HC123, the 3rd pin of the multivibrator U9 divide two-way, all the way with the multi resonant
The 2nd pin of oscillator U9 is connected, and another way is connect with one end of resistance R19, and the other end of the resistance R19 divides two-way,
Connection+5V power output end, another way are grounded through capacitor C37 all the way, the 1st pin and the single-pass of the multivibrator U9
The 1st pin of road comparator U10 connects, and it is all the way first that the 13rd pin of the multivibrator U9, which divides two-way through resistance R20,
The output end of comparator circuit, another way are connect with the anode of zener diode D4, the cathode of zener diode D4 and+3.3V electricity
Source output terminal connection；
Second comparator circuit includes the multivibrator U11 of model CD74HC123, the multivibrator
The 1st pin of U11 is connect with one end of resistance R26, and the 10th pin of the multivibrator U11 and one end of resistance R31 connect
Connect, the other end of resistance R26, the other end of resistance R31, the 2nd pin of multivibrator U11 and multivibrator U11 the 9th
Pin is connect with the 1st pin of the single channel comparator U12, and the 13rd pin of the multivibrator U11 is through resistance R32
Divide two-way, is all the way the output end of the second comparator circuit, another way is connect with the anode of diode D5, the cathode of diode D5
It is connect with+3.3V power output end.
Compared with the prior art, the utility model has the following advantages:
1, rationally, structure is simple, and small in size, high sensitivity, the output signal rise time is fast, and stability is good, reliably for design
Property is strong.
2. the utility model detector uses air-holding type proportional counter, and working gas is closed, do not have to again at work
There is provided working gas, by the radiation information not directly measured be converted into can with electric impulse signal measured directly, avoid by
In influence of the inconsistent and changes in flow rate to measurement result of gaseous mass, opposite flow-gas proportional counter ensure that measurement
As a result there is better stability, reduce the influence of noise, reduce required equipment, improve the precision and model of measurement
It encloses, detection efficient is high, has bigger application space.
3. the spy that the utility model driving circuit only has a kind of majority carrier to do directional drift movement according to field-effect tube
Point reduces the influence of noise, improves signal-to-noise ratio, reduces extraneous interference, and stability is good.
4. the utility model is novel in design rationally, signal-to-noise ratio is improved using driving circuit, reduces extraneous interference, is utilized
First order amplifying circuit and second level amplifying circuit carry out pre-amplification to the small-signal exported from detector, recycle main amplification
Device, which amplifies again and is maintained at certain amplitude, passes through first comparator to meet the judgement of follow-up data and the processing of signal
Circuit screens out α and counts pulse, screens out β by the second comparator circuit and counts pulse, and circuit design is reasonable, makes convenient for promoting
With.
In conclusion the utility model is designed reasonably, using first order amplifying circuit and second level amplifying circuit to from spy
The small-signal for surveying device output carries out pre-amplification, and main amplifier is recycled to amplify and be maintained at certain amplitude again, to meet
The judgement of follow-up data and the processing of signal screen out α by first comparator circuit and count pulse, pass through the second comparator electricity
Road screens out β and counts pulse, and noise is low, low in energy consumption, and functional reliability is high, convenient for promoting the use of.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the utility model.
Fig. 2 is the circuit diagram of the driving circuit of the utility model, first order amplifying circuit and second level amplifying circuit.
Fig. 3 is the circuit diagram of the main amplifier of the utility model.
Fig. 4 is the circuit diagram of the utility model monostable forming.
Fig. 5 is the circuit diagram of the utility model first comparator.
Fig. 6 is the circuit diagram of the second comparator of the utility model.
Description of symbols:
1-detector；2-driving circuits；3-1-first order amplifying circuit；
3-2-second level amplifying circuit；4-main amplifiers；5-monostable wave-shaping circuits；
6-1-first comparator circuit；The second comparator circuit of 6-2-.
Specific embodiment
As shown in Figure 1, the utility model includes the detector 1 successively to connect, driving circuit 2, first order amplifying circuit 3-
1, second level amplifying circuit 3-2, main amplifier 4, monostable wave-shaping circuit 5 and comparator circuit, the comparator circuit include
The first comparator circuit 6-1 of pulse is counted for screening α and the second comparator circuit 6-2 of pulse, institute are counted for screening β
State the signal input part of first comparator circuit 6-1 and the second comparator circuit 6-2 with the monostable wave-shaping circuit 5
Signal output end connection.
It should be noted that the setting of detector 1 is for detecting the surface α, β radioactive pollution and believing radioactive pollution
Number it is converted into electric signal, consequently facilitating subsequent circuit is analyzed and processed above-mentioned signal, driving circuit 2 is utilized to improve noise
Than extraneous interference being reduced, using first order amplifying circuit 3-1 and second level amplifying circuit 3-2 to exporting from detector
Small-signal carries out pre-amplification, recycles main amplifier 4 to amplify and be maintained at certain amplitude again, to meet follow-up data
The processing of judgement and signal screens out α by first comparator circuit 6-1 and counts pulse, discriminated by the second comparator circuit 6-2
Not Chu β count pulse, circuit design is reasonable.
In the present embodiment, the detector 1 is air-holding type proportional counter LND4313.
As shown in Figure 2, during actual use, detector 1 uses air-holding type proportional counter LND4313, by work gas
Body is closed, does not have to provide working gas again at work, converting the radiation information not directly measured to can directly measure
Electric impulse signal, avoid influence of the inconsistent and changes in flow rate due to gaseous mass to measurement result, opposite flow gas
Proportional counter ensure that measurement result with better stability, reduces the influence of noise, reduces required equipment,
The precision and range of measurement are improved, detection efficient is high, there is bigger application space, the proportional counter HND4313's
1st pin connects the end HVCC through resistance R1 and capacitor C1 in parallel, and the 2nd pin of the proportional counter HND4313 divides two-way, and one
Road is grounded through resistance R13 and capacitor C17 in parallel, and another way connects driving circuit 2 with capacitor C8 through capacitor C7, resistance R8, closes
Gas formula proportional counter detects low energy or the low particle than ionization, improves the precision and range of measurement, reduces the shadow of noise
It rings, there is better stability, improve the precision and range of measurement.
As shown in Fig. 2, the driving circuit 2 includes the technotron VT1 of model 3DJ8H, institute in the present embodiment
The drain electrode for stating technotron VT1 is connect through resistance R3 and resistance R2 with+12V power supply；The grid of the technotron VT1
Pole connects after capacitor C8, resistance R8 and capacitor C7 with the signal output end of detector 1；The source of the technotron VT1
Two-way is divided in pole, connect all the way through resistance R11 with -12V power supply, and another way is grounded through capacitor C14 and capacitor C15 in parallel.
It should be noted that the setting noise of technotron is small in driving circuit 2, and it is low in energy consumption, it is carried according to its majority
The characteristics of flowing subconductivity temperature stability is good, and capability of resistance to radiation is strong, improves signal-to-noise ratio, reduces extraneous interference.
As shown in Fig. 2, the first order amplifying circuit 3-1 includes amplifier LF357BN, the amplification in the present embodiment
The 7th pin of device LF357BN is connect with+12V power supply, and the inverting input terminal of the amplifier LF357BN is grounded through resistance R14,
The non-inverting input terminal of the amplifier LF357BN is connect with the drain electrode of the technotron VT1, the amplifier
The 6th pin of LF357BN divides two-way, all the way the reverse phase after resistance R9 and capacitor C12 in parallel with the amplifier LF357BN
Input terminal is connected, and another way connects one end of resistance R4；The other end of the resistance R4 divides two-way, is all the way first order amplification
The signal output end of circuit 3-1, grid of the another way through resistance R18 and capacitor C18 and the technotron VT1 in parallel
Connection, the 4th pin of the amplifier LF357BN divide two-way, connect all the way with -12V power supply, another way is followed by through capacitor C16
Ground；
The second level amplifying circuit 3-2 includes amplifier LM318N, the anti-phase input termination of the amplifier LM318N
The other end of one end of resistance R10, the resistance R10 divides two-way, is grounded all the way through capacitor C11 and resistance R6, another way is through electricity
Hinder R12 ground connection；The non-inverting input terminal of the amplifier LM318N divides two-way, all the way the sliding through resistance R15 Yu swept resistance R19
End connection, another way are grounded through resistance R16, and three tunnels of the 4th pin point of the amplifier LM318N are followed by through capacitor C19 all the way
Ground, another way connection -12V power end, third road is connect through swept resistance R19 with+12V power supply；The amplifier LM318N's
6th pin divides two-way, connects the inverting input terminal of the amplifier LM318N, another way through resistance R7 and capacitor C9 in parallel all the way
One end of capacitor C13 is connected, the other end of the capacitor C13 divides two-way, is grounded all the way through resistance R17, another way connecting interface
The 3rd pin of P3.
It should be noted that the setting of first order amplifying circuit 3-1 and second level amplifying circuit 3-2 are to through driving circuit
The small-signal of 2 outputs carries out pre-amplification, consequently facilitating handling the electric impulse signal exported in subsequent conditioning circuit.
As shown in figure 3, the main amplifier 4 includes the chip U14 and model of model THS4281 in the present embodiment
The 2nd pin of the chip U15, the chip U14 of THS4281 are connect through resistance R43 and capacitor C59 with the 3rd pin of interface P3,
The 3rd pin of the chip U14 is grounded through resistance R46, and the 7th pin of the chip U14 is connect with+5V power supply, the chip
The 6th pin of U14 divides two-way, connects all the way through resistance R39 with the 2nd pin of the chip U14, another way through resistance R44 with
The 3rd pin of the chip U15 connects；The 2nd pin of the chip U15 is grounded through resistance R40, another way, the chip U15
The 7th pin connect with+5V power supply, the 6th pin of the chip U15 divides two-way, all the way through resistance R41 and the chip U15
The connection of the 2nd pin, another way connect with one end of capacitor C60, and the other end of capacitor C60 divides two-way, connects all the way through resistance R45
Ground, another way are the signal output end of main amplifier 4.
It should be noted that the setting of main amplifier 4 is in order to by first order amplifying circuit 3-1 and second level amplifying circuit
Signal after 3-2 pre-amplification amplified again and is maintained at certain amplitude, to meet judgement and the signal of follow-up data
Processing.
As shown in figure 4, the monostable wave-shaping circuit 5 includes that the single channel of model TLV3201 compares in the present embodiment
Device U10, single channel comparator U12 and single channel comparator U13, the 3rd pin of the single channel comparator U10 pass through resistance
R23 is connect with the sliding end of swept resistance R27, and a fixing end of swept resistance R27 is connect with+5V power supply, swept resistance R27
Another fixing end ground connection, the 4th pin of the single channel comparator U10 is defeated by resistance R24 and the signal of main amplifier 4
Outlet connection；The 3rd pin of the single channel comparator U12 is connect by resistance R33 with the sliding end of swept resistance R35, sliding
A fixing end of dynamic resistance R35 is connect with+5V power supply, another fixing end ground connection of swept resistance R27, the single channel ratio
The 4th pin compared with device U12 is connect by resistance R34 with the signal output end of main amplifier 4；The single channel comparator U13's
3rd pin is connect by resistance R38 with the sliding end of swept resistance R101, a fixing end of swept resistance R101 and+5V electricity
Source connection, another fixing end ground connection of swept resistance R101, the 4th pin of the single channel comparator U13 pass through resistance R42
It is connect with the signal output end of main amplifier 4.
It should be noted that the setting of monostable wave-shaping circuit 5 be in order to be responded to the signal of amplified acquisition,
When not having external signal triggering, monostable wave-shaping circuit 5 is in stable state, and under external signal triggering, circuit is turned to from stable state
Transient state, response is fast, and monostable wave-shaping circuit 5 is using single channel comparator U10, the single channel comparator of model TLV3201
U12 and single channel comparator U13, single channel comparator U10 are for responding αsource, single channel comparator U12 and single channel ratio
Compared with device U13 for responding radiator beta-ray, low-power consumption, processing speed is fast.
As shown in Figure 5 and Figure 6, in the present embodiment, the first comparator circuit 6-1 includes model CD74HC123
Multivibrator U9, the 3rd pin of the multivibrator U9 divide two-way, all the way with the 2nd pin of the multivibrator U9
It is connected, another way is connect with one end of resistance R19, and the other end of the resistance R19 divides two-way, and connection+5V power supply is defeated all the way
Outlet, another way are grounded through capacitor C37, and the 1st of the 1st pin of the multivibrator U9 and the single channel comparator U10 the
Pin connection, the 13rd pin of the multivibrator U9 divides two-way through resistance R20, all the way for first comparator circuit 6-1's
Output end, another way are connect with the anode of zener diode D4, and the cathode and+3.3V power output end of zener diode D4 connects
It connects；
The second comparator circuit 6-2 includes the multivibrator U11 of model CD74HC123, the multi-harmonic-oscillations
The 1st pin of device U11 is connect with one end of resistance R26, one end of the 10th pin and resistance R31 of the multivibrator U11
Connection, the other end of resistance R26, the other end of resistance R31, the 2nd pin of multivibrator U11 and multivibrator U11
9th pin is connect with the 1st pin of the single channel comparator U12, and the 13rd pin of the multivibrator U11 is through resistance
R32 divides two-way, is all the way the output end of the second comparator circuit 6-2, another way is connect with the anode of diode D5, diode D5
Cathode connect with+3.3V power output end.
It should be noted that being to screen out α counting pulse for comparing by the setting of first comparator circuit 6-1, lead to
The setting for crossing the second comparator circuit 6-2 is to screen out β counting pulse for comparing, when multivibrator U11 and multi-harmonic-oscillations
When device U9 does not have trigger signal, α, beta activity surface contamination are not present in environment；When multivibrator U11 the 1st pin,
When 2nd pin, the 9th pin, the 10th pin and the 11st pin have trigger signal, there are alpha activity surface contaminations in environment；When
The 1st pin, the 2nd pin, the 9th pin and the 10th pin of multivibrator U11 has trigger signal or multivibrator U11
The 11st pin when having trigger signal, there are beta activity surface contaminations in environment, and it is good to screen effect.
When the utility model is used, sample acquires signal by detector 1, by driving circuit 2 to small electricity
Pulse signal is driven, then by first order amplifying circuit 3-1 and second level amplifying circuit 3-2 to small electric impulse signal
It carries out being sent into main amplifier 4 after pre-amplification and be amplified again, obtained electric signal is using single track stable state wave-shaping circuit 5 and the
One comparator circuit 6-1 and the second comparator circuit 6-2 compares and screens out α counting pulse and β counting pulse, and distinguishes and output α
Radioactive source and radiator beta-ray, noise is low, low in energy consumption, and functional reliability is high.
The above is only the preferred embodiment of the utility model, not imposes any restrictions to the utility model, all
According to any simple modification to the above embodiments of the utility model technical spirit, change and equivalent structural changes, still
Belong in the protection scope of technical solutions of the utility model.
Claims (7)
1. a kind of α, beta activity Measurement of surface contamination circuit, it is characterised in that: including detector (1), the driving electricity successively to connect
Road (2), first order amplifying circuit (3-1), second level amplifying circuit (3-2), main amplifier (4), monostable wave-shaping circuit (5) and
Comparator circuit, the comparator circuit include counting the first comparator circuit (6-1) of pulse and for screening for screening α
β counts the second comparator circuit (6-2) of pulse, the first comparator circuit (6-1) and the second comparator circuit (6-
2) signal input part is connect with the signal output end of the monostable wave-shaping circuit (5).
2. a kind of α described in accordance with the claim 1, beta activity Measurement of surface contamination circuit, it is characterised in that: the detector
It (1) is air-holding type proportional counter LND4313.
3. a kind of α described in accordance with the claim 1, beta activity Measurement of surface contamination circuit, it is characterised in that: the driving electricity
Road (2) includes the technotron VT1 of model 3DJ8H, and the drain electrode of the technotron VT1 is through resistance R3 and resistance
R2 is connect with+12V power supply；The grid of the technotron VT1 after capacitor C8, resistance R8 and capacitor C7 with detector
(1) signal output end connects；The source electrode of the technotron VT1 divides two-way, connects all the way through resistance R11 and -12V power supply
It connects, another way is grounded through capacitor C14 and capacitor C15 in parallel.
4. a kind of α described in accordance with the claim 3, beta activity Measurement of surface contamination circuit, it is characterised in that: the first order
Amplifying circuit (3-1) includes amplifier LF357BN, and the 7th pin of the amplifier LF357BN is connect with+12V power supply, described
The inverting input terminal of amplifier LF357BN is grounded through resistance R14, the non-inverting input terminal of the amplifier LF357BN and the knot
The drain electrode of type field-effect tube VT1 connects, and the 6th pin of the amplifier LF357BN divides two-way, all the way through resistance R9 in parallel and
It is connected after capacitor C12 with the inverting input terminal of the amplifier LF357BN, another way connects one end of resistance R4；The electricity
The other end of resistance R4 divides two-way, is all the way the signal output end of first order amplifying circuit (3-1), and another way is through resistance in parallel
R18 and capacitor C18 is connect with the grid of the technotron VT1, and the 4th pin of the amplifier LF357BN divides two-way,
It is connect all the way with -12V power supply, another way is grounded after capacitor C16；
The second level amplifying circuit (3-2) includes amplifier LM318N, and the anti-phase input of the amplifier LM318N terminates electricity
One end of R10 is hindered, the other end of the resistance R10 divides two-way, is grounded all the way through capacitor C11 and resistance R6, another way is through resistance
R12 ground connection；The non-inverting input terminal of the amplifier LM318N divides two-way, all the way the sliding end through resistance R15 Yu swept resistance R19
Connection, another way are grounded through resistance R16, and three tunnels of the 4th pin point of the amplifier LM318N are grounded after capacitor C19 all the way,
Another way connection -12V power end, third road are connect through swept resistance R19 with+12V power supply；The 6th of the amplifier LM318N
Pin divides two-way, connects the inverting input terminal of the amplifier LM318N through resistance R7 and capacitor C9 in parallel all the way, and another way connects
One end of capacitor C13 is connect, the other end of the capacitor C13 divides two-way, is grounded all the way through resistance R17, another way connecting interface P3
The 3rd pin.
5. a kind of α, beta activity Measurement of surface contamination circuit according to claim 4, it is characterised in that: the main amplification
Device (4) includes the chip U15 of the chip U14 and model THS4281 of model THS4281, the 2nd pin of the chip U14
It is connect through resistance R43 and capacitor C59 with the 3rd pin of interface P3, the 3rd pin of the chip U14 is grounded through resistance R46, institute
The 7th pin for stating chip U14 is connect with+5V power supply, and the 6th pin of the chip U14 divides two-way, all the way through resistance R39 and institute
The 2nd pin for stating chip U14 connects, and another way is connect through resistance R44 with the 3rd pin of the chip U15；The chip U15
The 2nd pin be grounded through resistance R40, the 7th pin of another way, the chip U15 is connect with+5V power supply, the chip U15's
6th pin divides two-way, connect all the way through resistance R41 with the 2nd pin of the chip U15, and one end of another way and capacitor C60 connect
It connects, the other end of capacitor C60 divides two-way, is grounded all the way through resistance R45, and another way is the signal output end of main amplifier (4).
6. a kind of α, beta activity Measurement of surface contamination circuit according to claim 5, it is characterised in that: the monostable
Wave-shaping circuit (5) includes single channel comparator U10, single channel comparator U12 and the single channel comparator of model TLV3201
The 3rd pin of U13, the single channel comparator U10 are connect by resistance R23 with the sliding end of swept resistance R27, swept resistance
A fixing end of R27 is connect with+5V power supply, another fixing end ground connection of swept resistance R27, the single channel comparator
The 4th pin of U10 is connect by resistance R24 with the signal output end of main amplifier (4)；The 3rd of the single channel comparator U12
Pin is connect by resistance R33 with the sliding end of swept resistance R35, and a fixing end and+5V power supply of swept resistance R35 connects
It connects, the 4th pin of the single channel comparator U12 is connect by resistance R34 with the signal output end of main amplifier (4)；It is described
The 3rd pin of single channel comparator U13 is connect by resistance R38 with the sliding end of swept resistance R101, swept resistance R101's
One fixing end is connect with+5V power supply, another fixing end ground connection of swept resistance R101, the single channel comparator U13's
4th pin is connect by resistance R42 with the signal output end of main amplifier (4).
7. a kind of α, beta activity Measurement of surface contamination circuit according to claim 6, it is characterised in that: first ratio
Compared with the multivibrator U9 that device circuit (6-1) includes model CD74HC123, the 3rd pin of the multivibrator U9 is divided to two
Road is connected with the 2nd pin of the multivibrator U9 all the way, and another way is connect with one end of resistance R19, the resistance
The other end of R19 divides two-way, and connection+5V power output end, another way are grounded through capacitor C37 all the way, the multivibrator U9
The 1st pin connect with the 1st pin of the single channel comparator U10, the 13rd pin of the multivibrator U9 is through resistance
R20 divides two-way, is all the way the output end of first comparator circuit (6-1), another way is connect with the anode of zener diode D4, surely
The cathode of pressure diode D4 is connect with+3.3V power output end；
Second comparator circuit (6-2) includes the multivibrator U11 of model CD74HC123, the multivibrator
The 1st pin of U11 is connect with one end of resistance R26, and the 10th pin of the multivibrator U11 and one end of resistance R31 connect
Connect, the other end of resistance R26, the other end of resistance R31, the 2nd pin of multivibrator U11 and multivibrator U11 the 9th
Pin is connect with the 1st pin of the single channel comparator U12, and the 13rd pin of the multivibrator U11 is through resistance R32
Divide two-way, is all the way the output end of the second comparator circuit (6-2), another way is connect with the anode of diode D5, diode D5
Cathode connect with+3.3V power output end.
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| CN201821881714.8U CN209132433U (en) | 2018-11-15 | 2018-11-15 | A kind of α, beta activity Measurement of surface contamination circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538068A (en) * | 2020-05-07 | 2020-08-14 | 中国计量科学研究院 | Radioactive surface pollution measuring device and surface pollution measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111538068A (en) * | 2020-05-07 | 2020-08-14 | 中国计量科学研究院 | Radioactive surface pollution measuring device and surface pollution measuring method |
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Address after: Yanta District in Shaanxi province Xi'an City Road 710061, No. 108 Patentee after: Xi'an Zhonghe Nuclear Instrument Co.,Ltd. Address before: Yanta District in Shaanxi province Xi'an City Road 710061, No. 108 Patentee before: XI'AN ZHONGHE NUCLEAR APPARATUS CO.,LTD. |
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