CN208334663U - low background α, β measuring device - Google Patents
low background α, β measuring device Download PDFInfo
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- CN208334663U CN208334663U CN201820179733.XU CN201820179733U CN208334663U CN 208334663 U CN208334663 U CN 208334663U CN 201820179733 U CN201820179733 U CN 201820179733U CN 208334663 U CN208334663 U CN 208334663U
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Abstract
The utility model provides a kind of Low background α, β measuring device, comprising: main detector, anticoincidence detector and control circuit, main detector and anticoincidence detector are connected with control circuit respectively；Main detector is input to control circuit for acquiring main detectable signal, and by main detectable signal, and main detectable signal is α, β ray that sample generates, and/or, the detectable signal that radioactivity background generates；Anticoincidence detector is input to control circuit for acquiring anticoincidence signal, and by anticoincidence signal, and anticoincidence signal is the detectable signal that radioactivity background generates；Control circuit is for determining whether the interference by radioactivity background counts the measurement result of α, β activity measurement and when determining to be not affected by interference during carrying out α, β activity measurement to sample for main detectable signal and anticoincidence signal.The utility model alleviates existing measuring device and is easy the technical issues of being interfered by radioactivity background when carrying out α, β activity measurement.
Description
Technical field
The utility model relates to the technical fields of radiation detection, more particularly, to a kind of Low background α, β measuring device.
Background technique
Total α, the total β that Low background α, β measuring device is widely used in the various samples such as water sample, biological sample, environment sample are living
Degree measurement, is the necessary equipment of environmental monitoring station, physical health care center, Running-water Company.
Because the specific radioactivity of institute's sample is lower, measurement environment need to keep extremely low environmental exact details, except installation vitriol chamber
Shielding is outer to need installation anticoincidence detection device also to shield the background interference of high-energy environment background radiation generation.Because Low background measures
To the high request of Low background, anticoincidence detection can whole accurate shielding environment background radiations interference, and sample measurement period
It is generally several or more than ten hour, need anticoincidence detector that can continually and steadily work.
Utility model content
In view of this, the utility model is alleviated the purpose of this utility model is to provide a kind of Low background α, β measuring device
Existing measuring device is easy the technical issues of being interfered by radioactivity background when carrying out α, β activity measurement.
In a first aspect, the utility model embodiment provide a kind of Low background α, β measuring device include: main detector, it is anti-
Meet detector and control circuit, wherein the main detector and the anticoincidence detector respectively with the control circuit phase
Connection；The main detectable signal is input to the control circuit for acquiring main detectable signal by the main detector,
In, the main detectable signal is α, β ray generated based on sample, and/or, the detectable signal that radioactivity background generates；Institute
Anticoincidence detector is stated for acquiring anticoincidence signal, and the anticoincidence signal is input to the control circuit, wherein institute
Stating anticoincidence signal is the detectable signal generated based on radioactivity background；The control circuit is for determining the main detection letter
Number and the anticoincidence signal to sample carry out α, β activity measurement during whether the interference by radioactivity background,
And when determining to be not affected by interference, the measurement result of α, β activity measurement is counted.
Further, the detector and control circuit quantity are multiple, wherein the main detector respectively with it is each
The control circuit is connected, for sending the main detectable signal to each control circuit；The anticoincidence detector
It is connected with each control circuit, for sending the anticoincidence signal to each control circuit.
Further, the control circuit includes: discriminator circuit and logical operation circuit, wherein the discriminator circuit packet
The first discriminator circuit and the second discriminator circuit are included, first discriminator circuit is connected with the main detector, for obtaining
State the main detectable signal of main detector transmission；Second discriminator circuit is connected with the anticoincidence detector, is used for
Obtain the anticoincidence signal of the anticoincidence detector；The logical operation circuit respectively with first discriminator circuit and
Second discriminator circuit is connected, for based on first discriminator circuit examination result and second discriminator circuit
Screen result determine to sample carry out α, β activity measurement during whether the interference by radioactivity background.
Further, first discriminator circuit includes: the first examination sub-circuit, and second screens sub-circuit and third examination
Sub-circuit；Wherein, described first screen sub-circuit, described second screen sub-circuit and the third screen sub-circuit respectively with institute
It states main detector to be connected, the main detectable signal sent for obtaining the main detector respectively.
Further, the logical operation circuit includes: first and door, and second and door, third and door and NAND gate,
In, described first is connected with the input terminal of door with the output end of the first examination sub-circuit, described second with the input of door
It holds and is connected with the output end of the two examinations sub-circuit, the input terminal of the third and door and the third screen sub-circuit
Output end is connected, and the input terminal of the NAND gate screens the output of sub-circuit and two discriminator circuit with the third respectively
End is connected, and the output end of the NAND gate is connect with the third with door input terminal respectively, third and gate output terminal respectively with
First is connected with door and described second with the input terminal of door；Described first and door, described second and door, the third and door and
The output end of the NAND gate is connected with single-chip microcontroller respectively.
Further, the control circuit further include: the first operational amplification circuit and the second operational amplification circuit, wherein
First operational amplification circuit is arranged between the main detector and first discriminator circuit, for obtaining the main spy
The main detectable signal of device output is surveyed, and is input to first discriminator circuit after amplifying to the main detectable signal
In；Second operational amplification circuit is arranged between the anticoincidence detector and second discriminator circuit, for obtaining
The anticoincidence signal of the anticoincidence detector output, and be input to after being amplified to the anticoincidence signal described
In second discriminator circuit.
Further, the main detector includes: Low background α, β twin scintillator, the first low potassium photomultiplier tube and first
Preposition amplification bleeder circuit, wherein Low background α, β twin scintillator potassium photomultiplier tube low with described first is connected, institute
The first low potassium photomultiplier tube is stated to be connected with the input terminal of the described first preposition amplification bleeder circuit；Described Low background α, β are bis-
Scintillator is used to absorb α, β ray of sample generation, and/or, radioactivity background, and it is based on α, β ray, and/or, institute
It states radioactivity background and generates fluorescence；The first low potassium photomultiplier tube is used to the fluorescence being converted to electric signal；It is described
First preposition amplification bleeder circuit obtains the main detectable signal for amplifying to the electric signal after amplification.
Further, before the anticoincidence detector includes: anticoincidence scintillator, the second low potassium photomultiplier tube, second
Put big bleeder circuit, wherein the input terminal of the second low potassium photomultiplier tube and the described second preposition amplification bleeder circuit
It is connected, the output end of the second preposition amplification bleeder circuit is connected with the anticoincidence scintillator, and the anticoincidence is dodged
Bright body generates fluorescence for absorbing radioactivity background, and based on the radioactivity background；The second low potassium photomultiplier transit
Pipe is for being converted to electric signal for the fluorescence；The second preposition amplification bleeder circuit is for putting the electric signal
Greatly, the anticoincidence signal is obtained after amplification.
Further, described device further include: host computer, the host computer are connected with single-chip microcontroller, described for obtaining
The data of single-chip microcontroller transmission, and the data of single-chip microcontroller transmission are stored.
In Low background α, β measuring device provided by the utility model, comprising: main detector, anticoincidence detector and control
Circuit, wherein main detector and anticoincidence detector are connected with control circuit respectively；Main detector is for acquiring main detection letter
Number, and main detectable signal is input to control circuit, wherein main detectable signal is α, β ray generated based on sample, and/or,
The detectable signal that radioactivity background generates；Anticoincidence detector inputs anticoincidence signal for acquiring anticoincidence signal
To control circuit, wherein anticoincidence signal is the detectable signal generated based on radioactivity background；Control circuit is for determining master
Whether detectable signal and anticoincidence signal are done during carrying out α, β activity measurement to sample by radioactivity background
It disturbs, and when determining to be not affected by interference, counts the measurement result of α, β activity measurement.As can be seen from the above description, this is practical new
Low background α, β measuring device provided by type alleviates existing measuring device and is easy when carrying out α, β activity measurement by ring
The technical issues of border background radiation is interfered.
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of schematic diagram of Low background α, β measuring device provided by the embodiment of the utility model；
Fig. 2 is a kind of multi-channel control circuit provided by the embodiment of the utility model and anticoincidence detector and main detector
Layout drawing；
Fig. 3 is the schematic diagram of another optional Low background α, β measuring device provided by the embodiment of the utility model；
Fig. 4 is that the utility model embodiment provides a kind of schematic diagram of main detector；
Fig. 5 is a kind of schematic diagram of anticoincidence detector provided by the embodiment of the utility model.
Icon:
10- main detector；20- anticoincidence detector；30- control circuit；301- discriminator circuit；A301- first screens electricity
Road；The second discriminator circuit of B301-；A3011- first screens sub-circuit；A3012- second screens sub-circuit；A3013 third is screened
Sub-circuit；302- logical operation circuit；3021- first and door；3022- second and door；3023- NAND gate；3024- third with
Door；303- single-chip microcontroller；40- host computer；101- Low background α, β twin scintillator；The low potassium photomultiplier tube of 102- first；103-
One preposition amplification bleeder circuit；201- anticoincidence scintillator；The low potassium photomultiplier tube of 202- second；The preposition amplification point of 203- second
Volt circuit；The first operational amplification circuit of 304-；The second operational amplification circuit of 305-.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model a part is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, fall within the protection scope of the utility model under the premise of creative work.
For convenient for understanding the present embodiment, first to a kind of Low background α, β disclosed in the utility model embodiment
Measuring device anticoincidence device describes in detail.
According to the utility model embodiment, a kind of embodiment of Low background α, β measuring device is provided.
Fig. 1 is according to a kind of schematic diagram of Low background α, β measuring device of utility model embodiment, as shown in Figure 1, the electricity
Road figure includes: main detector 10, anticoincidence detector 20 and control circuit 30, wherein the main detector 10 and the anti-symbol
Detector 20 is closed to connect with the control circuit phase 30 respectively；
The main detectable signal is input to the control circuit for acquiring main detectable signal by the main detector 10
30, wherein the main detectable signal is α, β ray generated based on sample, and/or, the detection letter that radioactivity background generates
Number；
The anticoincidence signal is input to the control for acquiring anticoincidence signal by the anticoincidence detector 20
Circuit 30, wherein the anticoincidence signal is the detectable signal generated based on radioactivity background；The control circuit 30 is used for
Determine the main detectable signal and the anticoincidence signal during carrying out α, β activity measurement to sample whether by environment
The interference of background radiation, and when determining to be not affected by interference, count the measurement result of α, β activity measurement.
In Low background α, β measuring device provided by the utility model, comprising: main detector, anticoincidence detector and control
Circuit, wherein main detector and anticoincidence detector are connected with control circuit respectively；Main detector is for acquiring main detection letter
Number, and main detectable signal is input to control circuit, wherein main detectable signal is α, β ray generated based on sample, and/or,
The detectable signal that radioactivity background generates；Anticoincidence detector inputs anticoincidence signal for acquiring anticoincidence signal
To control circuit, wherein anticoincidence signal is the detectable signal generated based on radioactivity background；Control circuit is for determining master
Whether detectable signal and anticoincidence signal are done during carrying out α, β activity measurement to sample by radioactivity background
It disturbs, and when determining to be not affected by interference, counts the measurement result of α, β activity measurement.As can be seen from the above description, this is practical new
Low background α, β measuring device provided by type alleviates existing measuring device and is easy when carrying out α, β activity measurement by ring
The technical issues of border background radiation is interfered.
In an optional embodiment, as shown in Fig. 2, 30 quantity of the control circuit is multiple, wherein described
Main detector 10 is connected with each control circuit 30 respectively, for sending the main detection to each control circuit
Signal；The anticoincidence detector 20 is connected with each control circuit, for sending institute to each control circuit
State anticoincidence signal.
As shown in figure 3, the control circuit 30 includes: discriminator circuit 301 and logical operation circuit 302, wherein the Zhen
Other circuit 301 includes the first discriminator circuit A301 and the second discriminator circuit B301,
The first discriminator circuit A301 is connected with the main detector 10, sends for obtaining the main detector 10
The main detectable signal；
The second discriminator circuit B301 is connected with the anticoincidence detector 20, for obtaining the anticoincidence detection
The anticoincidence signal of device 20；
The logical operation circuit 302 respectively with the first discriminator circuit A301 and the second discriminator circuit B301 phase
Connection, the examination result for examination result and the second discriminator circuit B301 based on first discriminator circuit 301 are true
Be scheduled on to sample carry out α, β activity measurement during whether the interference by radioactivity background.
Specifically, as shown in figure 3, the first discriminator circuit A301 includes: the first examination sub-circuit A3011, second discriminates
Small pin for the case circuit A3012 and third screen sub-circuit A3013, wherein described first screens sub-circuit A3011, and described two screen son
Circuit A3012 and the third screen sub-circuit A3013 and are connected respectively with the main detector 10, for obtaining institute respectively
State the main detectable signal of the transmission of main detector 10.
As shown in figure 3, the logical operation circuit 302 includes: first and door 3021, second with door 3022, NAND gate
3023 and third and door 3024, wherein described first is defeated with the input terminal of door 3021 and the first examination sub-circuit A3011
Outlet is connected, and described second is connected with the input terminal of door 3022 with the output end of the two examinations sub-circuit A3012, described
Third is connected with the input terminal of door 3024 with the output end that the third screens sub-circuit A3013, the NAND gate 3023
The output end that input terminal screens sub-circuit A3013 and the second discriminator circuit B301 with the third respectively is connected, described
The output end of NAND gate 3023 is connected with the third with the input terminal of door 3024, the output end point of the third and door 3024
It is not connected with described first with door 3021 and described second with the input terminal of door 3022；Described first with door 3021, described the
Two are connected with single-chip microcontroller 303 with door 3022, the third with door 3024 and the output end of the NAND gate 3023 respectively.
As shown in figure 3, described device further include: host computer 40, the host computer 40 are connected with single-chip microcontroller 303, are used for
The data that the single-chip microcontroller 303 transmits are obtained, and the data of the single-chip microcontroller 303 transmission are stored.
As shown in figure 3, the control circuit 30 further include: the first operational amplification circuit 304 and the second operational amplification circuit
305, wherein
First operational amplification circuit 304 setting the main detector 10 and the first discriminator circuit A301 it
Between, the main detectable signal exported for obtaining the main detector 10, and after being amplified to the main detectable signal
It is input in the first discriminator circuit A301；
Second operational amplification circuit sets 305 and sets in the anticoincidence detector 20 and the second discriminator circuit B301
Between, the anticoincidence signal exported for obtaining the anticoincidence detector 20, and the anticoincidence signal is put
It is input in the second discriminator circuit B301 after big.
In another optional embodiment, as shown in figure 4, the main detector 10 includes: the bis- flashings of Low background α, β
Body 101, the first low potassium photomultiplier tube 102 and the first preposition amplification bleeder circuit 103, wherein the bis- flashings of Low background α, β
The potassium photomultiplier tube 102 low with described first of body 101 is connected, before the first low potassium photomultiplier tube 102 and described first
The input terminal for putting big bleeder circuit 103 is connected.
Low background α, β twin scintillator 101 is used to absorb α, β ray of sample generation, and/or, radioactivity background,
And it is based on α, β ray, and/or, the radioactivity background generates fluorescence；The first low potassium photomultiplier tube 102 is used
In the fluorescence is converted to electric signal；The first preposition amplification bleeder circuit 103 is used to amplify the electric signal,
The main detectable signal is obtained after amplification.
In another optional embodiment, as shown in figure 5, the anticoincidence detector 20 includes: anticoincidence flashing
Body 201, the second preposition amplification bleeder circuit 203 of low potassium photomultiplier tube 202, second, wherein the second low potassium photomultiplier transit
Pipe 202 is connected with the input terminal of the described second preposition amplification bleeder circuit 203, the second preposition amplification bleeder circuit 202
Output end be connected with the anticoincidence scintillator 201,
The anticoincidence scintillator 201 is used to absorb the radioactivity background in sample, and is based on the environmental exact details spoke
Penetrate generation fluorescence；The second low potassium photomultiplier tube 202 is used to the fluorescence being converted to electric signal；It is put before described second
Big bleeder circuit 203 obtains the anticoincidence signal for amplifying to the electric signal after amplification.
Next Fig. 3 is combined to be described in detail and supplement the course of work of Low background α, β measuring device:
Firstly, Low background α, β twin scintillator of main detector can be generated for absorbing particle containing α or β particle in sample
Fluorescence, photomultiplier tube is used to be converted into electric signal to the fluorescence (namely optical signal) at this time, and by electric signal transmission to first
Make enhanced processing in operational amplifier.Target electric signal is obtained after amplification.
Then, target electric signal is transmitted separately in three discriminator circuits, each discriminator circuit have its threshold value (that is,
Threshold value one, threshold value two and threshold value three).The working principle of discriminator circuit is: when target electric signal is (that is, the main detection in Fig. 2 is believed
Number) impulse amplitude when being less than corresponding threshold value, which corresponds to when the impulse amplitude of target electric signal is greater than without output
Threshold value when, which has output.
In this application, the working principle of the anticoincidence scintillator in anticoincidence detector and Low background α, β twin scintillator
It is identical, it is all that fluorescence is generated after being absorbed into radioactivity background.At this point, the photomultiplier tube in anticoincidence detector can incite somebody to action
The fluorescence that anticoincidence scintillator generates is converted to electric signal, and amplifies to the electric signal, obtains anticoincidence signal.At this point,
Anticoincidence signal will be input in anticoincidence discriminator circuit and handle, wherein the work of anticoincidence discriminator circuit and foregoing circuit
It is identical to make principle, that is, if the impulse amplitude of anticoincidence signal is less than the threshold value of anticoincidence discriminator circuit, electricity is screened in anticoincidence
Road is without output, if the impulse amplitude of anticoincidence signal is greater than the threshold value of anticoincidence discriminator circuit, anticoincidence discriminator circuit has
Output.
Wherein, the principle of anticoincidence detector is that the pulse for meeting the time is eliminated using coincident circuit.That is, working as
Third corresponding to threshold value three screens sub-circuit when having output (for example, 1), when the second discriminator circuit also has output (for example, 1),
Third screens sub-circuit and anticoincidence discriminator circuit (that is, second discriminator circuit) is carried out with after non-process, and output is exactly 0.It should
The output result (for example, 1) that output result (that is, 0) and third screen sub-circuit is asked with after, and output result is 0.At this point, even if
First screens sub-circuit (discriminator circuit corresponding to threshold value one) or the second examination sub-circuit (electricity of examination corresponding to threshold value two
Road) there is output (for example, 1), then the first examination sub-circuit and third and the result (that is, 0) of door output are asked and handle it
Afterwards, and without output (that is, 0)；The output result result (that is, 0) of second examination sub-circuit and third and door is asked and is handled
Later, and without output (that is, 0), third screens sub-circuit and third and the result (that is, 0) of door output is asked and handles it
Afterwards, still without output (that is, 0).
The third corresponding to the threshold value three screens sub-circuit when having output (for example, 1), and the second discriminator circuit also has output
When (for example, 0), third screens sub-circuit and the second discriminator circuit is carried out with after non-process, and output is exactly 1, should be with non-result
Discriminate sub-circuit with third not asking with after, output result is 1.At this point, if the first examination sub-circuit has output (for example, 1),
The result that first examination sub-circuit and third and the result (that is, 1) of door output ask Yu later is exactly 1, first is screened at this time
Sub-circuit has output.If the second discriminator circuit has output (for example, 1), second screens sub-circuit and third and door output
The result that ask Yu later of result (that is, 1) be exactly 1, the second examination sub-circuit has output at this time.Similarly, if third
Screening the result (i.e. 1) that sub-circuit and third are exported with door and ask with result later is 1, at this point, third screens sub-circuit
There is output.
By aforesaid operations, effectively radioactivity background can be eliminated, so that activity measurement is more quasi-
Really.
In embodiment provided by the utility model, radioactivity background is eliminated by anticoincidence, so that activity is surveyed
It is more accurate to measure, and reduces and the higher technical problem of measurement environmental exact details interference exists in the prior art.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In addition, in the description of the utility model embodiment unless specifically defined or limited otherwise, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can
To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the present invention.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that embodiment described above, only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the protection scope of the utility model is not limited thereto, although referring to aforementioned
The utility model is described in detail in embodiment, those skilled in the art should understand that: it is any to be familiar with this skill
The technical staff in art field within the technical scope disclosed by the utility model, still can be to skill documented by previous embodiment
Art scheme modify or can readily occur in variation or equivalent replacement of some of the technical features；And these modifications,
Variation or replacement, the spirit and model of the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described is wanted with right
Subject to the protection scope asked.
Claims (9)
1. a kind of Low background α, β measuring device characterized by comprising main detector, anticoincidence detector and control circuit,
Wherein, the main detector and the anticoincidence detector are connected with the control circuit respectively；
The main detectable signal is input to the control circuit for acquiring main detectable signal by the main detector, wherein
The main detectable signal is α, β ray generated based on sample, and/or, the detectable signal that radioactivity background generates；
The anticoincidence signal is input to the control circuit for acquiring anticoincidence signal by the anticoincidence detector,
Wherein, the anticoincidence signal is the detectable signal generated based on radioactivity background；
The control circuit is for determining that the main detectable signal and the anticoincidence signal are carrying out α, β activity measurement to sample
During whether the interference by radioactivity background counts the survey of α, β activity measurement and when determining to be not affected by interference
Amount is as a result, the control circuit includes: discriminator circuit and logical operation circuit.
2. the apparatus according to claim 1, which is characterized in that the control circuit quantity is multiple, wherein
The main detector is connected with each control circuit respectively, for sending the master to each control circuit
Detectable signal；
The anticoincidence detector is connected with each control circuit, described anti-for sending to each control circuit
Meet signal.
3. device according to claim 1 or 2, which is characterized in that the discriminator circuit includes the first discriminator circuit and the
Two discriminator circuits,
First discriminator circuit is connected with the main detector, the main detection sent for obtaining the main detector
Signal；
Second discriminator circuit is connected with the anticoincidence detector, for obtaining the described anti-of the anticoincidence detector
Meet signal；
The logical operation circuit is connected with first discriminator circuit and second discriminator circuit respectively, for being based on institute
The examination result of the examination result and second discriminator circuit of stating the first discriminator circuit, which is determined, is carrying out the survey of α, β activity to sample
During amount whether the interference by radioactivity background.
4. device according to claim 3, which is characterized in that first discriminator circuit includes: the first examination sub-circuit,
Second screens sub-circuit and third examination sub-circuit；
Wherein, described first screen sub-circuit, described two screen sub-circuit and the third screen sub-circuit respectively with the master
Detector is connected, the main detectable signal sent for obtaining the main detector respectively.
5. device according to claim 4, which is characterized in that the logical operation circuit includes: first and door, second with
Door, third and door and NAND gate；
Wherein, described first is connected with the input terminal of door with the output end of the first examination sub-circuit；
Described second is connected with the input terminal of door with the output end of the two examinations sub-circuit；
The third is connected with the input terminal of door with the output end that the third screens sub-circuit, the third and gate output terminal
It is connected respectively with described first with door and described second with the output end of door；
The output end that the input terminal of the NAND gate screens sub-circuit and two discriminator circuit with the third respectively is connected,
The output end of the NAND gate is connect with the third with door input terminal；
Described first and door, described second and door, the third and door and the output end of the NAND gate respectively with single-chip microcontroller phase
Connection.
6. device according to claim 3, which is characterized in that the control circuit further include: the first operational amplification circuit
With the second operational amplification circuit, wherein
First operational amplification circuit is arranged between the main detector and first discriminator circuit, described for obtaining
The main detectable signal of main detector output, and be input to described first after amplifying to the main detectable signal and screen
In circuit；
Second operational amplification circuit is arranged between the anticoincidence detector and second discriminator circuit, for obtaining
The anticoincidence signal of the anticoincidence detector output, and be input to after being amplified to the anticoincidence signal described
In second discriminator circuit.
7. the apparatus according to claim 1, which is characterized in that the main detector include: Low background α, β twin scintillator,
First low potassium photomultiplier tube and the first preposition amplification bleeder circuit, wherein Low background α, β twin scintillator and described first
Low potassium photomultiplier tube is connected, the input terminal of the first low potassium photomultiplier tube and the described first preposition amplification bleeder circuit
It is connected；
Low background α, β twin scintillator is used to absorb α, β ray of sample generation, and/or, radioactivity background, and be based on
α, β ray, and/or, the radioactivity background generates fluorescence；
The first low potassium photomultiplier tube is used to the fluorescence being converted to electric signal；
The first preposition amplification bleeder circuit obtains the main detection letter for amplifying to the electric signal after amplification
Number.
8. the apparatus according to claim 1, which is characterized in that the anticoincidence detector includes: anticoincidence scintillator,
Two low potassium photomultiplier tubes, the second preposition amplification bleeder circuit, wherein before the second low potassium photomultiplier tube and described second
The input terminal for putting big bleeder circuit is connected, and the output end of the second preposition amplification bleeder circuit and the anticoincidence flash
Body is connected,
The anticoincidence scintillator generates fluorescence for absorbing radioactivity background, and based on the radioactivity background；
The second low potassium photomultiplier tube is used to the fluorescence being converted to electric signal；
The second preposition amplification bleeder circuit obtains the anticoincidence letter for amplifying to the electric signal after amplification
Number.
9. the apparatus according to claim 1, which is characterized in that described device further include: host computer, the host computer and list
Piece machine is connected, and stores for obtaining the data of the single-chip microcontroller transmission, and to the data of single-chip microcontroller transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820179733.XU CN208334663U (en) | 2018-02-01 | 2018-02-01 | low background α, β measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820179733.XU CN208334663U (en) | 2018-02-01 | 2018-02-01 | low background α, β measuring device |
Publications (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008440A (en) * | 2018-02-01 | 2018-05-08 | 北京中科核安科技有限公司 | low background α, β measuring device |
| CN112068180A (en) * | 2020-09-15 | 2020-12-11 | 成都理工大学 | Online measuring device and method for alpha and beta radioactive nuclides in water body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008440A (en) * | 2018-02-01 | 2018-05-08 | 北京中科核安科技有限公司 | low background α, β measuring device |
| CN108008440B (en) * | 2018-02-01 | 2024-02-27 | 北京中科核安科技有限公司 | Low background alpha, beta measuring device |
| CN112068180A (en) * | 2020-09-15 | 2020-12-11 | 成都理工大学 | Online measuring device and method for alpha and beta radioactive nuclides in water body |
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