CN212321861U - Radioactive aerosol detection device - Google Patents
Radioactive aerosol detection device Download PDFInfo
- Publication number
- CN212321861U CN212321861U CN202021168153.4U CN202021168153U CN212321861U CN 212321861 U CN212321861 U CN 212321861U CN 202021168153 U CN202021168153 U CN 202021168153U CN 212321861 U CN212321861 U CN 212321861U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- path
- operational amplifier
- detector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model discloses a radioactive aerosol detection device, which comprises an aerosol flow guide mechanism, a detection processing mechanism and an aerosol sampling mechanism; the detection processing mechanism comprises a detection processing assembly and a collimator, wherein the detection processing assembly and the collimator are arranged on the detector shell, and the detection processing assembly comprises a first semiconductor detector, a second semiconductor detector, a first pre-amplification circuit board, a second pre-amplification circuit board, a voltage conversion circuit board and a partition board which are sequentially arranged. The utility model increases the incident ray number in the detector by arranging the collimator, thereby improving the detection efficiency of the detector; the method has the advantages that the inverse coincidence deduction of the gamma background in the detection data is realized by arranging the two semiconductor detectors, so that the data of alpha rays and beta rays detected by the first semiconductor detector are more accurate, and the using effect is better; the output signal of the detector is subjected to preliminary processing and amplification by the pre-amplification circuit board, so that the anti-interference capability of the output signal of the detector is stronger, and the transmission distance is wider.
Description
Technical Field
The utility model belongs to the technical field of the aerosol is surveyed, concretely relates to radioactive aerosol detection device.
Background
The existing radioactive aerosol detection device is generally in a low-radiation environment of a nuclear power station due to a single use environment, the requirement on the compactness of the detection device is not high, and the volume and the weight of the whole detection device are large. And the space on a post-processing hot room factory building and a nuclear power ship is limited, so that the requirement on the aerosol detection device is more compact and miniaturized. For the use environment with limited space, a PIPS semiconductor detector is generally used for detecting nuclear radiation signals, the PIPS detector is small in size and convenient to use, but output signals of the PIPS semiconductor detector are very weak, subsequent data processing outside the detector cannot be carried out, and meanwhile, the detection accuracy of radioactive rays is not good, so that related auxiliary circuits and structures need to be designed, and the radioactive aerosol detection device can achieve the purposes of miniaturization, light weight and high accuracy of the whole detection device.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the present invention is to provide a radioactive aerosol detecting device, which has a simple structure, a reasonable design and a strong practicability, and increases the number of incident rays into the detector by arranging a collimator, thereby improving the detection efficiency of the detector; the method has the advantages that the inverse coincidence deduction of the gamma background in the detection data is realized by arranging the two semiconductor detectors, so that the data of alpha rays and beta rays detected by the first semiconductor detector are more accurate, and the using effect is better; the output signal of the detector is subjected to preliminary processing and amplification by the pre-amplification circuit board, so that the anti-interference capability of the output signal of the detector is stronger, and the transmission distance is wider.
In order to solve the technical problem, the utility model discloses a technical scheme is: a radioactive aerosol detection device, comprising: the device comprises an aerosol flow guide mechanism, a detection processing mechanism arranged in the aerosol flow guide mechanism, and an aerosol sampling mechanism matched with the aerosol flow guide mechanism;
the aerosol flow guide mechanism comprises a shell and a filling body which is arranged in the shell and forms an air gap with the inner wall of the shell, the shell comprises a flow guide cone, a detection tank connected with the large-diameter end of the flow guide cone and an air inlet pipe arranged at the small-diameter end of the flow guide cone and communicated with the air gap, and the bottom of the detection tank is provided with a through hole matched with the detection processing mechanism;
the detection processing mechanism comprises a detector shell arranged in the filling body, a detection processing assembly arranged in the detector shell and a collimator arranged on the detector shell and matched with the through hole, the detection processing assembly comprises a first semiconductor detector, a second semiconductor detector, a first preamplification circuit board connected with the first semiconductor detector, a second preamplification circuit board connected with the second semiconductor detector, a voltage conversion circuit board and a partition board which are sequentially arranged along the length direction in the detector shell, and the detection end of the first semiconductor detector is matched with the collimator; the collimator comprises a plurality of collimating plates which are uniformly distributed in the circumferential direction around the central axis of the through hole, and one ends of the collimating plates, which are close to the central axis of the through hole, are connected with each other.
The radioactive aerosol detection device is characterized in that: the aerosol sampling mechanism comprises an air suction pump which is matched with the through hole and is used for introducing aerosol into the aerosol flow guide mechanism, and filter paper is arranged between the through hole and the air suction pump.
The radioactive aerosol detection device is characterized in that: the first semiconductor detector and the second semiconductor detector are both PIPS semiconductor detectors, a first pre-amplification circuit is integrated on the first pre-amplification circuit board and comprises a first operational amplifier U2 and a second operational amplifier U3, the non-inverting input end of the first operational amplifier U2 is divided into two paths, one path is connected with the drain electrode of a junction field effect transistor Q1, the other path is grounded through a resistor R3 and a capacitor C7 and a capacitor C24 which are connected in parallel, the grid electrode of the junction field effect transistor Q1 is connected with one end of the capacitor C11, the other end of the capacitor C11 is connected with the output end of the first semiconductor detector, the source electrode of the junction field effect transistor Q1 is grounded, the inverting input end of the first operational amplifier U2 is divided into two paths, one path is grounded through the resistor R9 and the capacitor C14 which are connected in parallel, the other path is connected with one end of the resistor R4, the other end of the resistor R4 is divided into three paths, one path is connected with the connecting end of a capacitor C24 and a resistor R3, the other path is grounded through a capacitor C8 and a capacitor C23 which are connected in parallel, the third path is connected with a 5V power supply, the output end of the first operational amplifier U2 is divided into three paths, one path is connected with the connecting end of the capacitor C11 and the grid electrode of the junction field effect transistor Q1 through a resistor R8, the other path is connected with the other end of the capacitor C11 through a capacitor C13, the third path is connected with the non-inverting input end of the second operational amplifier U3 through a capacitor C9, the connecting end of the capacitor C9 and the non-inverting input end of the second operational amplifier U3 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the inverting input end of the second operational amplifier U3 is connected with the inverting input end of the first operational amplifier U2 through a resistor R7, the output end of the second operational amplifier U3 is divided into two paths, one path is connected with the inverting input end of the second operational amplifier U, the connection end of the resistor R6 and the capacitor C12 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is the output end of the first pre-amplification circuit;
the second preamplifier circuit board is integrated with a second preamplifier circuit, the second preamplifier circuit comprises a third operational amplifier U4 and a fourth operational amplifier U5, the non-inverting input end of the third operational amplifier U4 is divided into two paths, one path is connected with the drain electrode of the junction field effect transistor Q2, the other path is grounded through a resistor R11 and a capacitor C15 and a capacitor C26 which are connected in parallel, the grid electrode of the junction field effect transistor Q2 is connected with one end of a capacitor C19, the other end of the capacitor C19 is connected with the output end of the first semiconductor detector, the source electrode of the junction field effect transistor Q2 is grounded, the inverting input end of the third operational amplifier U4 is divided into two paths, one path is grounded through a resistor R17 and a capacitor C22 which are connected in parallel, the other path is connected with one end of a resistor R12, the other end of the resistor R8 is divided into three paths, the other path is connected with the connecting end of the capacitor C26 and the resistor R11, and the other path is grounded through a capacitor C, the third path is connected with a 5V power supply, the output end of the third operational amplifier U4 is divided into three paths, one path is connected with the connecting end of the grid electrodes of the capacitor C19 and the junction field effect transistor Q2 through a resistor R16, the other path is connected with the other end of the capacitor C19 through a capacitor C21, the third path is connected with the non-inverting input end of the fourth operational amplifier U5 through a capacitor C17, the connecting end of the non-inverting input ends of the capacitor C17 and the fourth operational amplifier U5 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the inverting input end of the fourth operational amplifier U5 is connected with the inverting input end of the third operational amplifier U4 through a resistor R15, the output end of the fourth operational amplifier U5 is divided into two paths, one path is connected with the inverting input end of the fourth operational amplifier U5 through a resistor R13, the other path is grounded through a resistor R14 and a capacitor C20 in turn, the connecting end of a resistor R14 and a capacitor C82 18 are connected with one end.
The radioactive aerosol detection device is characterized in that: first preamplification circuit board and second preamplification circuit board all are connected with the voltage conversion circuit board, voltage conversion circuit and temperature sensor have integrateed on the voltage conversion circuit board, voltage conversion circuit includes that the model is AS78L 05's stabiliser U1, stabiliser U1's 3 rd pin and +12V power connection, stabiliser U1's 2 nd pin divides two the tunnel, be connected with +12V power through parallelly connected electric capacity C1 and electric capacity C3 all the way, another way ground connection, stabiliser U1's 1 st pin divides two tunnel, be connected electric capacity C4 and electric capacity C5 ground connection all the way through parallelly connected, another way is in proper order through electric capacity C2 and electric capacity C6 ground connection through resistance R1 and parallelly connected, resistance R and electric capacity C2's link is voltage conversion circuit's +5V voltage output.
The radioactive aerosol detection device is characterized in that: the detector shell comprises a detector tube and a sealing cover matched with the detector tube, a plug is arranged on the sealing cover, one end of the plug penetrates through the sealing cover to be connected with the voltage conversion circuit board, the first pre-amplification circuit board and the second pre-amplification circuit board, and the other end of the plug is connected with a computer through a cable.
The radioactive aerosol detection device is characterized in that: and the outer side of the detector tube is sleeved with a shockproof rubber sleeve.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a set up the accurate until first semiconductor detector of radioactive ray that the aerosol released on the collimator made filter paper openly, increase the incident ray number of inciding in the detector, improved the detection efficiency of detector, detection effect is better.
2. The utility model discloses a set up two semiconductor detector, first semiconductor detector detects alpha ray, beta ray and gamma ray, and the second semiconductor detector can only detect gamma ray, can realize through subsequent data processing that the anti-coincidence of the gamma background in the first semiconductor detector detection data is deducted, makes the data that first semiconductor detector detected alpha ray and beta ray more accurate, and the result of use is better.
3. The utility model is provided with the voltage conversion circuit board to stabilize the voltage of the power supply and convert the voltage into the preamplification circuit board to provide the power supply; the output signal of the detector is subjected to primary processing and amplification by arranging the preamplification circuit board, so that the anti-interference capability of the output signal of the detector is stronger, and the transmission distance is wider; the division plate is a metal division plate, and external interference signals are isolated by the division plate, so that the detector and the pre-amplification circuit board work normally, and interference is avoided.
In summary, the utility model has simple structure, reasonable design and strong practicability, and increases the number of incident rays into the detector by arranging the collimator, thereby improving the detection efficiency of the detector; the method has the advantages that the inverse coincidence deduction of the gamma background in the detection data is realized by arranging the two semiconductor detectors, so that the data of alpha rays and beta rays detected by the first semiconductor detector are more accurate, and the using effect is better; the output signal of the detector is subjected to preliminary processing and amplification by the pre-amplification circuit board, so that the anti-interference capability of the output signal of the detector is stronger, and the transmission distance is wider.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a bottom view of fig. 1 with the suction pump removed.
Fig. 3 is a schematic circuit diagram of a first preamplifier circuit according to the present invention.
Fig. 4 is a schematic circuit diagram of a second preamplifier circuit according to the present invention.
Fig. 5 is a schematic circuit diagram of the voltage conversion circuit of the present invention.
Description of reference numerals:
1-a flow guide cone; 2-detecting a tank; 3, an air inlet pipe;
4-a filler; 5-an air gap; 6-a first semiconductor detector;
7-a second semiconductor detector; 8-a first pre-amp circuit board;
9-a second pre-amp circuit board; 10-a voltage conversion circuit board;
11-a partition plate; 12-a collimation plate; 13-a suction pump;
14-a probe tube; 15-sealing cover; 16-a plug;
17-shockproof rubber sleeve; 18-through hole.
Detailed Description
As shown in fig. 1 and 2, the present invention includes an aerosol guiding mechanism, a detection processing mechanism disposed in the aerosol guiding mechanism, and an aerosol sampling mechanism cooperating with the aerosol guiding mechanism;
the aerosol flow guide mechanism comprises a shell and a filling body 4 which is arranged in the shell and forms an air gap 5 with the inner wall of the shell, the shell comprises a flow guide cone 1, a detection tank 2 connected with the large-diameter end of the flow guide cone 1 and an air inlet pipe 3 which is arranged at the small-diameter end of the flow guide cone 1 and is communicated with the air gap 5, and the bottom of the detection tank 2 is provided with a through hole 18 matched with the detection processing mechanism;
the detection processing mechanism comprises a detector shell arranged in the filling body 4, a detection processing assembly arranged in the detector shell and a collimator arranged on the detector shell and matched with the through hole 18, the detection processing assembly comprises a first semiconductor detector 6, a second semiconductor detector 7, a first preamplification circuit board 8 connected with the first semiconductor detector 6, a second preamplification circuit board 9 connected with the second semiconductor detector 7, a voltage conversion circuit board 10 and a partition board 11 which are sequentially arranged along the length direction in the detector shell, and the detection end of the first semiconductor detector 6 is matched with the collimator; the collimator comprises a plurality of collimation plates 12 which are uniformly distributed in the circumferential direction around the central axis of the through hole 18, and one ends of the collimation plates 12 close to the central axis of the through hole 18 are connected with each other.
It should be noted that the diversion cone 1 and the detection tank 2 are installed and connected through bolts, so that the sealing performance is good, and meanwhile, the detection processing mechanism is more convenient to disassemble and maintain and more convenient to use;
it should be noted that the collimation plate 12 is a stainless steel collimation plate; the emission directions of radioactive rays on the filter paper are disordered, the radioactive rays released by the aerosol on the filter paper are collimated to the front side of the first semiconductor detector 6 by arranging the collimation plate 12, the number of incident rays entering the detector is increased, the detection efficiency of the detector is improved, and the detection effect is better; in this embodiment, the number of the collimating plates 12 is six, and the collimator can better reduce the loss of incident particles, so that the detection result is more accurate;
it should be noted that, the first semiconductor detector 6 and the second semiconductor detector 7 are both PIPS semiconductor detectors, the PIPS semiconductor detectors are all called passivated ion implantation planar silicon semiconductor detectors, and by arranging the two semiconductor detectors, the first semiconductor detector 6 detects alpha rays, beta rays and gamma rays, and because the penetrability of the alpha rays and the beta rays is not strong, the second semiconductor detector 7 can only detect the gamma rays, and the anti-coincidence deduction of the gamma background in the detection data of the first semiconductor detector 6 can be realized through subsequent data processing, so that the data of the alpha rays and the beta rays detected by the first semiconductor detector 6 are more accurate, and the use effect is better;
it should be noted that, the voltage conversion circuit board 10 is arranged to stabilize the voltage of the power supply and convert the voltage into the pre-amplification circuit board to provide the power supply; the output signal of the detector is subjected to primary processing and amplification by arranging the preamplification circuit board, so that the anti-interference capability of the output signal of the detector is stronger, and the transmission distance is wider; the partition plate 11 is a metal partition plate, and external interference signals are isolated by arranging the partition plate 11, so that the detector and the preamplifier circuit board work normally, and interference is avoided;
it should be noted that, in order to avoid the loss caused by deposition, collision, adsorption and the like of the aerosol passing through the detection device, the surfaces of the shell and the filler 4 on the two sides of the air gap 5 are smooth, so that the airflow is smoothly and uniformly dispersed, the particle deposition is reduced, and meanwhile, the air gap formed by the shell and the filler 4 is smoothly transited when meeting the corner, so that the generation of gas turbulence is avoided, and the aerosol sampling result is more representative.
In this embodiment, the aerosol sampling mechanism includes an air pump 13 which is matched with the through hole 18 and used for introducing aerosol into the aerosol guiding mechanism, and the filter paper is disposed between the through hole 18 and the air pump 13.
It should be noted that the working speed of the air pump 13 is set to keep the gas flow in the air gap 5 within a flow value of 30L/min to 35L/min, so that the gas flow is buffered and uniformly dispersed in the air gap 5, aerosol particles are prevented from being deposited and adsorbed at the air inlet due to generated turbulence, the frequency of cleaning and maintenance of the device is reduced, and the detection efficiency is improved.
In this embodiment, as shown in fig. 3 and 4, the first semiconductor detector 6 and the second semiconductor detector 7 are both PIPS semiconductor detectors, a first preamplifier circuit is integrated on the first preamplifier circuit board 8, the first preamplifier circuit includes a first operational amplifier U2 and a second operational amplifier U3, the non-inverting input terminal of the first operational amplifier U2 is divided into two paths, one path is connected to the drain of the jfet Q1, the other path is grounded via a resistor R3 and a parallel capacitor C7 and a parallel capacitor C24, the gate of the jfet Q1 is connected to one end of a capacitor C11, the other end of the capacitor C11 is connected to the output terminal of the first semiconductor detector 6, the source of the jfet Q1 is grounded, the inverting input terminal of the first operational amplifier U2 is divided, the other path is grounded via a parallel resistor R9 and a parallel capacitor C14, and the other path is connected to one end of a resistor R4, the other end of the resistor R4 is divided into three paths, one path is connected with the connecting end of a capacitor C24 and a resistor R3, the other path is grounded through a capacitor C8 and a capacitor C23 which are connected in parallel, the third path is connected with a 5V power supply, the output end of the first operational amplifier U2 is divided into three paths, one path is connected with the connecting end of a capacitor C11 and the grid electrode of a junction field effect tube Q1 through a resistor R8, the other path is connected with the other end of the capacitor C13, the third path is connected with the non-inverting input end of a second operational amplifier U3 through a capacitor C9, the connecting end of the non-inverting input ends of the capacitor C9 and the second operational amplifier U3 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the inverting input end of the second operational amplifier U3 is connected with the inverting input end of the first operational amplifier U2 through a resistor R7, the output end of the second operational amplifier U3 is divided into two paths, the other path is grounded through a resistor R6 and a capacitor C12 in sequence, the connecting end of the resistor R6 and the capacitor C12 is connected with one end of a capacitor C10, and the other end of the capacitor C10 is the output end of the first pre-amplification circuit;
a second preamplifier circuit is integrated on the second preamplifier circuit board 9, the second preamplifier circuit comprises a third operational amplifier U4 and a fourth operational amplifier U5, the non-inverting input end of the third operational amplifier U4 is divided into two paths, one path is connected with the drain electrode of the junction field effect tube Q2, the other path is grounded through a resistor R11 and a capacitor C15 and a capacitor C26 which are connected in parallel in sequence, the grid electrode of the junction field effect tube Q2 is connected with one end of a capacitor C19, the other end of the capacitor C19 is connected with the output end of the first semiconductor detector 6, the source electrode of the junction field effect tube Q2 is grounded, the inverting input end of the third operational amplifier U4 is divided into two paths, one path is grounded through a resistor R17 and a capacitor C22 which are connected in parallel, the other path is connected with one end of a resistor R12, the other end of the resistor R8 is divided into three paths, one path is connected with the connecting end of the capacitor C26 and the resistor R11, the other path is grounded through a capacitor C, the third path is connected with a 5V power supply, the output end of the third operational amplifier U4 is divided into three paths, one path is connected with the connecting end of the grid electrodes of the capacitor C19 and the junction field effect transistor Q2 through a resistor R16, the other path is connected with the other end of the capacitor C19 through a capacitor C21, the third path is connected with the non-inverting input end of the fourth operational amplifier U5 through a capacitor C17, the connecting end of the non-inverting input ends of the capacitor C17 and the fourth operational amplifier U5 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the inverting input end of the fourth operational amplifier U5 is connected with the inverting input end of the third operational amplifier U4 through a resistor R15, the output end of the fourth operational amplifier U5 is divided into two paths, one path is connected with the inverting input end of the fourth operational amplifier U5 through a resistor R13, the other path is grounded through a resistor R14 and a capacitor C20 in turn, the connecting end of a resistor R14 and a capacitor C82 18 are connected with one end.
It should be noted that the output signal of the PIPS semiconductor detector is very weak, which needs to avoid all interferences, and meanwhile, in order to accurately transmit the output signal of the detector, the output signal of the detector is preliminarily amplified by arranging the preamplification circuit board, so that the output signal of the detector has stronger interference resistance and wider transmission distance.
In this embodiment, the types of the first operational amplifier U2, the second operational amplifier U3, the third operational amplifier U4, and the fourth operational amplifier U5 are MAX4477, and the jfet Q1 and the jfet Q2 are both n-channel jfets; the output signal of the detector is preliminarily amplified by the junction field effect transistor, and is further amplified and shaped by the two operational amplifiers, a small charge signal is converted into a voltage signal with a large amplitude, and an exponential pulse signal representing nuclear radiation information is finally output to be processed by a subsequent measurement processing circuit, so that a final detection result is obtained, and the detection result is more accurate.
In this embodiment, AS shown in fig. 5, the first pre-amplification circuit board 8 and the second pre-amplification circuit board 9 are both connected to the voltage conversion circuit board 10, the voltage conversion circuit board 10 is integrated with a voltage conversion circuit and a temperature sensor, the voltage conversion circuit includes a voltage regulator U1 with an AS78L05 model, a 3 rd pin of the voltage regulator U1 is connected to a +12V power supply, a 2 nd pin of the voltage regulator U1 is divided into two paths, one path is connected to the +12V power supply through a parallel capacitor C1 and a capacitor C3, the other path is grounded, a 1 st pin of the voltage regulator U1 is divided into two paths, one path is grounded through a parallel capacitor C4 and a capacitor C5, the other path is grounded through a resistor R1 and a parallel capacitor C2 and a capacitor C6, and a connection end of the resistor R and the capacitor C2 is a +5V voltage output end of the voltage conversion circuit.
It should be noted that the +5V voltage output end of the voltage conversion circuit is connected to the power input ends of the first pre-amplification circuit board 8 and the second pre-amplification circuit board 9;
in this embodiment, the resistance of the resistor R1 is 5.1 Ω, the resistances of the resistor R2, the resistor R6, the resistor R7, the resistor R10, the resistor R14 and the resistor R15 are all 2k Ω, the resistances of the resistor R3 and the resistor R11 are all 1k Ω, the resistances of the resistor R4 and the resistor R12 are all 10k Ω, the resistances of the resistor R5 and the resistor R13 are both 20k Ω, the resistances of the resistor R8 and the resistor R16 are both 100M Ω, and the resistances of the resistor R9 and the resistor R17 are both 2.4k Ω;
the capacitor C1 and the capacitor C2 are electrolytic capacitors and have capacitance values of 10 muF, the capacitors C3, C4 and C6 are all 0.1 muF, the capacitor C5 is 10 muF, the capacitors C7, C9, C12, C15, C17 and C20 are all 10nF, the capacitors C8, C10, C11, C16, C18 and C19 are all 1nF, the capacitors C13 and C21 are all 1pF, the capacitors C14 and C22 are all 100nF, the capacitors C23 and C25 are all 100 muF, and the capacitors C24 and C26 are all 10 muF;
in this embodiment, the temperature sensor is DS18B20, and the temperature sensor can monitor the temperature in the voltage conversion circuit board 10 and the detector housing in real time, so as to compensate the subsequent temperature, and make the detection result more accurate.
In this embodiment, the detector housing includes a detector tube 14 and a sealing cover 15 engaged with the detector tube 14, the sealing cover 15 is provided with a plug 16, one end of the plug 16 passes through the sealing cover 15 to be connected with the voltage conversion circuit board 10, the first pre-amplification circuit board 8 and the second pre-amplification circuit board 9, and the other end of the plug 16 is connected with the computer through a cable.
It should be noted that the first semiconductor detector 6, the second semiconductor detector 7, the first preamplifier circuit board 8, the second preamplifier circuit board 9, the voltage conversion circuit board 10 and the partition board 11 are all clamped in the detector tube 14, a sealing rubber strip is arranged between the detector tube 14 and the sealing cover 15, all welding edges of the first semiconductor detector 6 and the second semiconductor detector 7 are embedded, an epoxy resin edge sealing layer is not needed, the detector has strong environmental interference resistance, an incident window is firm and stable, and can be conveniently washed, and is stable and reliable.
In this embodiment, the outer side of the detector tube 14 is sleeved with a vibration-proof rubber sleeve 17.
It should be noted that the shockproof rubber sleeve 17 is arranged to ensure that the positions of various function boards in the detector tube 14 are firm and stable when the device is in use, so as to reduce the influence of external vibration on the various function boards and reduce the failure probability of the device.
The utility model discloses when using, place filter paper between aspiration pump 13 and through-hole 18, open aspiration pump 13, gas gets into air gap 5 from intake pipe 3, is taken out outside air gap 5 through aspiration pump 13 afterwards, aerosol in the gas is left over on filter paper, afterwards by the radioactivity of detection processing mechanism monitoring aerosol, the radioactive ray of aerosol passes through the collimator and collimates to first semiconductor detector 6 openly, increases the incident ray number in incidenting the detector, first semiconductor detector 6 detects alpha ray, beta ray and gamma ray, because alpha ray and beta ray penetrability are not strong, second semiconductor detector 7 can only detect gamma ray, realize through subsequent data processing that the gamma background in the first semiconductor detector 6 detection data is reconciled and deduct, carry out preliminary treatment and amplification through preamplification circuit board to the output signal of detector, the anti-interference capability of the output signal of the detector is stronger; when the filter paper needs to be replaced, the air pump 13 is taken down to replace the filter paper, and then the monitoring operation can be carried out again.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (6)
1. A radioactive aerosol detection device, comprising: the device comprises an aerosol flow guide mechanism, a detection processing mechanism arranged in the aerosol flow guide mechanism, and an aerosol sampling mechanism matched with the aerosol flow guide mechanism;
the aerosol flow guide mechanism comprises a shell and a filling body (4) which is arranged in the shell and forms an air gap (5) with the inner wall of the shell, the shell comprises a flow guide cone (1), a detection tank (2) connected with the large-diameter end of the flow guide cone (1) and an air inlet pipe (3) arranged at the small-diameter end of the flow guide cone (1) and communicated with the air gap (5), and the bottom of the detection tank (2) is provided with a through hole (18) matched with the detection processing mechanism;
the detection processing mechanism comprises a detector shell arranged in the filling body (4), a detection processing assembly arranged in the detector shell and a collimator arranged on the detector shell and matched with the through hole (18), the detection processing assembly comprises a first semiconductor detector (6), a second semiconductor detector (7), a first preamplification circuit board (8) connected with the first semiconductor detector (6), a second preamplification circuit board (9) connected with the second semiconductor detector (7), a voltage conversion circuit board (10) and a partition board (11), and the detection end of the first semiconductor detector (6) is matched with the collimator; the collimator comprises a plurality of collimating plates (12) which are uniformly distributed in the circumferential direction around the central axis of the through hole (18), and one ends of the collimating plates (12) close to the central axis of the through hole (18) are connected with each other.
2. A radioactive aerosol detection apparatus according to claim 1, wherein: the aerosol sampling mechanism comprises an air suction pump (13) which is matched with the through hole (18) and is used for introducing aerosol into the aerosol flow guide mechanism, and filter paper is arranged between the through hole (18) and the air suction pump (13).
3. A radioactive aerosol detection apparatus according to claim 1, wherein: the first semiconductor detector (6) and the second semiconductor detector (7) are both PIPS semiconductor detectors, a first pre-amplification circuit is integrated on the first pre-amplification circuit board (8), the first pre-amplification circuit comprises a first operational amplifier U2 and a second operational amplifier U3, the non-inverting input end of the first operational amplifier U2 is divided into two paths, one path is connected with the drain electrode of a junction field effect transistor Q1, the other path is grounded through a resistor R3 and a capacitor C7 and a capacitor C24 which are connected in parallel, the grid electrode of the junction field effect transistor Q1 is connected with one end of the capacitor C11, the other end of the capacitor C11 is connected with the output end of the first semiconductor detector (6), the source electrode of the junction field effect transistor Q1 is grounded, the inverting input end of the first operational amplifier U2 is divided into two paths, the other path is grounded through the resistor R9 and the capacitor C14 which are connected in parallel, and the other path is connected with one end of the resistor R4, the other end of the resistor R4 is divided into three paths, one path is connected with the connecting end of a capacitor C24 and a resistor R3, the other path is grounded through a capacitor C8 and a capacitor C23 which are connected in parallel, the third path is connected with a 5V power supply, the output end of the first operational amplifier U2 is divided into three paths, one path is connected with the connecting end of a capacitor C11 and the grid electrode of a junction field effect tube Q1 through a resistor R8, the other path is connected with the other end of the capacitor C13, the third path is connected with the non-inverting input end of a second operational amplifier U3 through a capacitor C9, the connecting end of the non-inverting input ends of the capacitor C9 and the second operational amplifier U3 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the inverting input end of the second operational amplifier U3 is connected with the inverting input end of the first operational amplifier U2 through a resistor R7, the output end of the second operational amplifier U3 is divided into two paths, the other path is grounded through a resistor R6 and a capacitor C12 in sequence, the connecting end of the resistor R6 and the capacitor C12 is connected with one end of a capacitor C10, and the other end of the capacitor C10 is the output end of the first pre-amplification circuit;
a second preamplifier circuit is integrated on the second preamplifier circuit board (9), the second preamplifier circuit comprises a third operational amplifier U4 and a fourth operational amplifier U5, the non-inverting input end of the third operational amplifier U4 is divided into two paths, one path is connected with the drain electrode of the junction field effect transistor Q2, the other path is grounded through a resistor R11 and a capacitor C15 and a capacitor C26 which are connected in parallel in sequence, the grid electrode of the junction field effect transistor Q2 is connected with one end of a capacitor C19, the other end of the capacitor C19 is connected with the output end of the first semiconductor detector (6), the source electrode of the junction field effect transistor Q2 is grounded, the inverting input end of the third operational amplifier U4 is divided into two paths, one path is grounded through a resistor R17 and a capacitor C22 which are connected in parallel, the other path is connected with one end of a resistor R12, the other end of the resistor R12 is divided into three paths, one path is connected with the connecting end of a capacitor C26 and a resistor R11, and the other path is grounded through a capacitor C36, the third path is connected with a 5V power supply, the output end of the third operational amplifier U4 is divided into three paths, one path is connected with the connecting end of the grid electrodes of the capacitor C19 and the junction field effect transistor Q2 through a resistor R16, the other path is connected with the other end of the capacitor C19 through a capacitor C21, the third path is connected with the non-inverting input end of the fourth operational amplifier U5 through a capacitor C17, the connecting end of the non-inverting input ends of the capacitor C17 and the fourth operational amplifier U5 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the inverting input end of the fourth operational amplifier U5 is connected with the inverting input end of the third operational amplifier U4 through a resistor R15, the output end of the fourth operational amplifier U5 is divided into two paths, one path is connected with the inverting input end of the fourth operational amplifier U5 through a resistor R13, the other path is grounded through a resistor R14 and a capacitor C20 in turn, the connecting end of a resistor R14 and a capacitor C82 18 are connected with one end.
4. A radioactive aerosol detection apparatus according to claim 3, wherein: first preamplification circuit board (8) and second preamplification circuit board (9) all are connected with voltage conversion circuit board (10), voltage conversion circuit board (10) go up to integrate voltage conversion circuit and temperature sensor, voltage conversion circuit includes that the model is AS78L 05's stabiliser U1, stabiliser U1's 3 rd pin and +12V power connection, stabiliser U1's 2 nd pin divides two the tunnel, divide two the tunnel through parallelly connected electric capacity C1 and electric capacity C3 and +12V power connection all the way, another way ground connection, stabiliser U1's 1 st pin divides two the tunnel, all the way electric capacity C4 and electric capacity C5 ground connection through parallelly connected, another way is in proper order through electric capacity C2 and electric capacity C6 ground connection of resistance R1 and parallelly connected, resistance R and electric capacity C2's link does voltage conversion circuit's +5V voltage output end.
5. A radioactive aerosol detection apparatus according to claim 1, wherein: the detector shell comprises a detector tube (14) and a sealing cover (15) matched with the detector tube (14), a plug (16) is arranged on the sealing cover (15), one end of the plug (16) penetrates through the sealing cover (15) to be connected with the voltage conversion circuit board (10), the first pre-amplification circuit board (8) and the second pre-amplification circuit board (9), and the other end of the plug (16) is connected with a computer through a cable.
6. A radioactive aerosol detection apparatus according to claim 5, wherein: and a shockproof rubber sleeve (17) is sleeved on the outer side of the detector tube (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021168153.4U CN212321861U (en) | 2020-06-22 | 2020-06-22 | Radioactive aerosol detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021168153.4U CN212321861U (en) | 2020-06-22 | 2020-06-22 | Radioactive aerosol detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212321861U true CN212321861U (en) | 2021-01-08 |
Family
ID=74027618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021168153.4U Active CN212321861U (en) | 2020-06-22 | 2020-06-22 | Radioactive aerosol detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212321861U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588357A (en) * | 2021-08-04 | 2021-11-02 | 中国科学院上海应用物理研究所 | Automatic paper feeding, sampling and measuring device for radioactive aerosol |
-
2020
- 2020-06-22 CN CN202021168153.4U patent/CN212321861U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588357A (en) * | 2021-08-04 | 2021-11-02 | 中国科学院上海应用物理研究所 | Automatic paper feeding, sampling and measuring device for radioactive aerosol |
| CN113588357B (en) * | 2021-08-04 | 2024-05-03 | 上海中科新核智能科技有限公司 | Automatic paper feeding sampling and measuring device for radioactive aerosol |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201096508Y (en) | Flash detector for material level detection | |
| CN212321861U (en) | Radioactive aerosol detection device | |
| CN101832955A (en) | High-sensitivity alpha energy spectrum measuring method of radon concentration in air | |
| CN214845798U (en) | Wide-range inert gas radiation detection system | |
| CN104570038A (en) | Method and device for quickly measuring radon concentration | |
| CN203217083U (en) | Air radioactive aerosol monitor | |
| CN107389387A (en) | Portable trace mercury analyzer | |
| CN201666954U (en) | Radon synchroballistic type tritium in the air continuous monitoring instrument | |
| CN108279431B (en) | Portable radiation dosimeter, dose monitoring equipment and segmented processing method | |
| CN200941093Y (en) | Probe-type capacity sensor for thickness measurement | |
| CN105353397A (en) | Radon and thoron continuous measurement device and method based on static collection method | |
| CN102253402B (en) | Special charge sensitive amplifying circuit for gold silicon surface barrier semiconductor detector | |
| CN203965572U (en) | Based on the system of flexible piezoelectric membraneous material monitoring GIS partial discharge position | |
| CN109493984A (en) | A kind of Nuclear Plant breakage on-line measuring device | |
| CN214845799U (en) | Radioactive fission gas detection device | |
| CN206710614U (en) | The measuring system of radioactivity inert gas | |
| CN108459339B (en) | Portable radiation dosimeter and dose monitoring equipment | |
| CN204789406U (en) | A signal processing system that is used for beta to penetrate line method measuring atmospheric particulates concentration | |
| CN100371737C (en) | Method of detecting radon and its daughter alpha energy spectrum using atmospheric air pulse ionization chamber | |
| CN201540262U (en) | Soil radon daughter static absorption and alpha spectrum measuring device | |
| CN213365043U (en) | Aerosol monitor based on tellurium-zinc-cadmium detector | |
| CN108802792A (en) | The measuring device and method of radioactivity inert gas | |
| CN213846620U (en) | Charge sensitive preamplification circuit of underwater gamma spectrometer | |
| CN114325809B (en) | Neutron dosimeter based on current integral electronic system | |
| CN109917443A (en) | High energy gamma radiation detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
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. |