CN211741592U - Multi-path intelligent radon-thorium analyzer - Google Patents
Multi-path intelligent radon-thorium analyzer Download PDFInfo
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- CN211741592U CN211741592U CN201921943417.6U CN201921943417U CN211741592U CN 211741592 U CN211741592 U CN 211741592U CN 201921943417 U CN201921943417 U CN 201921943417U CN 211741592 U CN211741592 U CN 211741592U
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Abstract
The utility model belongs to the technical field of nuclear radiation detects, concretely relates to multichannel intelligence radon thorium analysis appearance, including detector group 1, measurement host computer 2, host computer 3. The utility model discloses technical scheme is not enough to traditional radon thorium analysis appearance existence, has designed neotype multichannel intelligence radon thorium analysis appearance and can realize all the way, two-way, four ways detector independent radioactivity measurement simultaneously, has satisfied big sample in batches and parallel sample simultaneous measurement's demand, easy operation, low in cost, saving cost.
Description
Technical Field
The utility model belongs to the technical field of nuclear radiation detects, concretely relates to multichannel intelligence radon thorium analysis appearance.
Background
The radon-thorium analyzer is a emanation measuring device for measuring the content of radioactive elements, namely radium and thorium, and can also be used for measuring the concentration of trace radon emanation in a water sample and a tunnel.
The traditional radon-thorium analyzer can only measure one scintillation chamber at the same time, and cannot meet the requirements of measurement of a large number of samples and simultaneous measurement of parallel samples.
The radon-thorium analyzer adopts the integral measurement of a scintillation detector, and has a good plateau area line, which is beneficial to improving the stability of the device. The noise of the photomultiplier increases with the increase of high voltage, when the noise energy equivalent of the photomultiplier and the noise energy equivalent of the measurement host are higher than the minimum energy equivalent of rays, no plateau can be measured, and the length of a plateau area of the prior radon-thorium analyzer is generally about 100V-150V, so that the requirement of some industries that the width of the plateau area is more than 200V cannot be met.
The radon-thorium analyzer usually adopts a relative measurement method, the instrument needs to be regularly calibrated by quantitative radon gas generated by a radioactive source 226Ra bubbling method, the purchasing control of the radioactive source is strict in the current country, and the shortage of radium sources is widely reflected by users.
At present, a radon chamber sampling method is generally adopted to take a certain amount of radon gas to scale an instrument, and different scaling methods bring great inconvenience to use.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide an easy operation, high efficiency, high stability's multichannel intelligence radon thorium analysis appearance to overcome the above-mentioned not enough that prior art exists.
In order to realize the purpose, the utility model adopts the technical scheme that:
a multi-path intelligent radon-thorium analyzer comprises a detector group 1, a measuring host 2 and an upper computer 3;
first, detector group 1
The detector group 1 is composed of detector modules, and is configured according to requirements to form a multi-path detector module, specifically one of the following forms: the system comprises a 1-path detector module, a 2-path detector module and a 4-path detector module;
the detector module adopts an integrated module, and one detector module consists of three spherical scintillation chambers 5, a photomultiplier tube 4, a preamplifier 6 and a circular rotary platform 7;
the spherical scintillation chamber 5 is coupled and connected with a photocathode of the photomultiplier tube 4 through an organic glass optical window to provide a measuring gas source for the nuclear detection system;
each path of detector module is provided with 3 spherical scintillation chambers 5, only one spherical scintillation chamber 5 is subjected to alpha ray measurement, negative voltage pulse signals are output, mutual influence is avoided, and the other two spherical scintillation chambers 5 are subjected to gas emission standing at the same time;
7. the multi-path intelligent radon-thorium analyzer of claim 1 further comprising: standing for 1-3 hours after radon gas sampling is completed, then measuring, and rotating the spherical scintillation chamber 5 to a measurement position for alpha ray measurement after standing is completed, thereby realizing multi-path uninterrupted measurement.
Second, the measuring host 2
The high-voltage power supply and the low-voltage power supply of the detector group module are provided by a high-voltage module 21 and a low-voltage module 22 in the measuring host 2, signals output by the detector module enter the measuring host 2 for processing, analyzing and recording, and the high-voltage, the low-voltage and the signals are connected through high-frequency cables;
the measurement host 2 comprises a high-voltage module 21, a low-voltage module 22, a communication module 23, a single chip microcomputer 24 and a signal processing module consisting of a main amplifier module 25, a differential circuit 26, a single-channel module 27 and a forming circuit 28, and the measurement host 2 is used for amplifying, inverting and amplitude screening signals output by different detector modules and recording the number of rays;
the low-voltage module 22 converts 220V alternating voltage into a stable low-voltage power supply to ensure that the normal low-voltage working power supply of the measurement host and the detector group is ensured;
the high-voltage module 21 converts the low voltage into the high voltage required by the detector group;
the acquired nuclear signal information is transmitted to the upper computer 3 through the communication module 23, and serial port communication or internet port communication is adopted;
the whole working process is controlled by the singlechip 24;
the signal processing module comprises a main amplifier module 25, a differential circuit 26, a single-channel module 27 and a shaping circuit 28;
the main amplifier module 25 amplifies and inverts the signal output by the detector module 1 to make the signal meet the required requirements;
the differential circuit 26 is arranged in front of the single-channel module 27, the pulse width of the voltage output by the detector group 1 is within the range of 10-20 microseconds, the time constant of the differential circuit is within the range of 1-1.5 microseconds, and the amplitude of the signal is compensated by adjusting the amplification factor of the main amplifier module 25;
the single-channel module 27 eliminates dark current of the photomultiplier and noise interference of nuclear electronics, and discriminates the amplitude of the detector signal;
the shaping circuit 28 is connected with the singlechip 24 and outputs monostable signals to meet the requirements of subsequent digital circuit signal processing;
third, the upper computer 3
The upper computer 3 connects the measurement host 2 with a PC, counts, analyzes and processes the nuclear signals transmitted by the measurement host to obtain the radioactivity of the emanation, and stores, exports and prints the report forms of the data.
Further, in the multi-channel intelligent radon-thorium analyzer, the detector module is provided with a spherical scintillation chamber with the model of ST-203 and a photomultiplier tube 4 with the model of GDB-44.
Furthermore, as mentioned above, the spherical scintillation chamber 5 is composed of two organic glass hemispheres coated with ZnS-Ag scintillating material on the inner surface, and two organic glass circular light guide partition plates which are perpendicular to each other and coated with ZnS-Ag coating on the surface are arranged in the cavity of the scintillation chamber, so as to divide the interior of the spherical scintillation chamber 5 into four chambers.
Further, as mentioned above, the gas outlet 35 and the gas inlet 36 of the scintillation chamber are respectively communicated with two adjacent chambers, except that the partition plate between the two adjacent chambers has no gas hole, in addition, gas holes are arranged between the adjacent chambers and are respectively connected with the chambers on two sides, so that sample gas can fully contact the four chambers and then is discharged out of the scintillation chamber, and the effective detection sensitive volume of alpha particles generated by radon and radon daughter is improved.
Furthermore, according to the multi-path intelligent radon-thorium analyzer, the scintillation ball is arranged in the metal protective shell, and the inner surface of the metal shell is the reflecting layer used for improving the collection efficiency of scintillation light.
Further, the thickness of the ZnS-Ag scintillation material coating of the multi-path intelligent radon-thorium analyzer is 10mg/cm2The detection efficiency of alpha particles is 100%; the volume of the spherical scintillation chamber 5 is 0.5L.
Furthermore, according to the multi-path intelligent radon-thorium analyzer, radon gas is subjected to standing for 1-3 hours after sampling is completed and then is measured, and after standing is completed, the spherical scintillation chamber 5 is rotated to a measurement position to perform alpha ray measurement, so that multi-path simultaneous uninterrupted measurement is realized.
Further, according to the multi-path intelligent radon-thorium analyzer, the upper computer 3 realizes the following functions according to the requirements of relevant industry standards and a method for measuring the radon chamber scales of a hospital: the method comprises five sample measurements of two K value scales of a source bubbling method and a radon chamber sampling method, counting measurement, radon measurement in water, radium measurement in rock and radon measurement in gas.
Further, according to the multi-path intelligent radon-thorium analyzer, the upper computer 3 controls the whole measuring process by setting parameters.
The utility model discloses technical scheme's beneficial effect lies in:
aiming at the defects of the traditional radon-thorium analyzer, the novel multi-path intelligent radon-thorium analyzer is designed to realize simultaneous independent radioactivity measurement of one path, two paths and four paths of detectors, so that the requirement of simultaneous measurement of large batches of samples and parallel samples is met, and the radon-thorium analyzer is simple in operation, low in manufacturing cost and low in cost.
The traditional signal processing circuit is improved: a differential circuit is added in front of the single-channel discrimination circuit and amplitude compensation is carried out through an amplifying circuit, so that the influence of detector noise caused by high voltage rise is greatly reduced, the anti-interference capability of the whole instrument is provided, and the plateau width (about 300V) of a plateau area line is greatly increased.
The designed upper computer software integrates a liquid radium bubbling method and a radon chamber sampling method, so that the scaling process of the product is greatly facilitated, and the use of customers is facilitated.
Drawings
FIG. 1 is a schematic diagram of the appearance structure of a multi-path intelligent radon-thorium analyzer.
In the figure: the device comprises a detector group 1, a measurement host 2, an upper computer 3, a photomultiplier 4, a spherical scintillation chamber 5, a preamplifier 6, a circular rotary platform 7, a high-voltage module 21, a low-voltage module 22, a communication module 23, a single chip microcomputer 24, a main amplifier module 25, a differential circuit 26, a single-channel module 27 and a forming circuit 28.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model relates to a multi-path intelligent radon-thorium analyzer, which comprises a detector group 1, a measuring host 2 and an upper computer 3;
first, detector group 1
The detector group 1 is composed of detector modules, and is configured according to requirements to form a multi-path detector module, specifically one of the following forms: the system comprises a 1-path detector module, a 2-path detector module and a 4-path detector module;
the detector module adopts an integrated module, and one detector module consists of three spherical scintillation chambers 5, a photomultiplier tube 4, a preamplifier 6 and a circular rotary platform 7;
in the detector module, the model of the spherical scintillation chamber is ST-203, and the model of the photomultiplier tube 4 is GDB-44.
The spherical scintillation chamber 5 is coupled and connected with a photocathode of the photomultiplier tube 4 through an organic glass optical window to provide a measuring gas source for the nuclear detection system;
the spherical scintillation chamber 5 consists of two organic glass hemispheres with the inner surfaces coated with ZnS-Ag scintillation materials, two organic glass circular light guide clapboards which are perpendicular to each other and coated with ZnS-Ag coatings are arranged in the cavity of the scintillation chamber, and the interior of the spherical scintillation chamber 5 is divided into four chambers.
The air outlet 35 and the air inlet 36 of the scintillation chamber are respectively communicated with two adjacent chambers, except that the partition plate between the two adjacent chambers is not provided with air holes, the air holes are arranged between the adjacent chambers and are respectively connected with the chambers at two sides, so that sample gas can be fully contacted with the four chambers and then discharged out of the scintillation chamber, and the effective detection sensitive volume of alpha particles generated by radon and radon daughter is improved.
The scintillation ball is arranged in the metal protective shell, and the inner surface of the metal shell is a reflecting layer for improving the collection efficiency of scintillation light.
The thickness of the ZnS-Ag scintillating material coating is 10mg/cm2The detection efficiency of alpha particles is 100%; the volume of the spherical scintillation chamber 5 is 0.5L.
Each path of detector module is provided with 3 spherical scintillation chambers 5, only one spherical scintillation chamber 5 is subjected to alpha ray measurement, negative voltage pulse signals are output, mutual influence is avoided, and the other two spherical scintillation chambers 5 are subjected to gas emission standing at the same time;
standing for 1-3 hours after radon gas sampling is completed, then measuring, and rotating the spherical scintillation chamber 5 to a measurement position for alpha ray measurement after standing is completed, thereby realizing multi-path uninterrupted measurement.
Second, the measuring host 2
The high-voltage power supply and the low-voltage power supply of the detector group module are provided by a high-voltage module 21 and a low-voltage module 22 in the measuring host 2, signals output by the detector module enter the measuring host 2 for processing, analyzing and recording, and the high-voltage, the low-voltage and the signals are connected through high-frequency cables;
the measurement host 2 comprises a high-voltage module 21, a low-voltage module 22, a communication module 23, a single chip microcomputer 24 and a signal processing module consisting of a main amplifier module 25, a differential circuit 26, a single-channel module 27 and a forming circuit 28, and the measurement host 2 is used for amplifying, inverting and amplitude screening signals output by different detector modules and recording the number of rays;
the low-voltage module 22 converts 220V alternating voltage into a stable low-voltage power supply to ensure that the normal low-voltage working power supply of the measurement host and the detector group is ensured;
the high-voltage module 21 converts the low voltage into the high voltage required by the detector group;
the acquired nuclear signal information is transmitted to the upper computer 3 through the communication module 23, and serial port communication or internet port communication is adopted;
the whole working process is controlled by the singlechip 24;
the signal processing module comprises a main amplifier module 25, a differential circuit 26, a single-channel module 27 and a shaping circuit 28;
the main amplifier module 25 amplifies and inverts the signal output by the detector module 1 to make the signal meet the required requirements;
the differential circuit 26 is arranged in front of the single-channel module 27, the pulse width of the voltage output by the detector group 1 is within the range of 10-20 microseconds, the time constant of the differential circuit is within the range of 1-1.5 microseconds, and the amplitude of the signal is compensated by adjusting the amplification factor of the main amplifier module 25;
the single-channel module 27 eliminates dark current of the photomultiplier and noise interference of nuclear electronics, and discriminates the amplitude of the detector signal;
the shaping circuit 28 is connected with the singlechip 24 and outputs monostable signals to meet the requirements of subsequent digital circuit signal processing;
third, the upper computer 3
The upper computer 3 connects the measurement host 2 with a PC, counts, analyzes and processes the nuclear signals transmitted by the measurement host to obtain the radioactivity of the emanation, and stores, exports and prints the report forms of the data.
The upper computer 3 realizes the following functions according to the requirements of relevant industry standards and a method for measuring the radon chamber scales of a hospital: the method comprises five sample measurements of two K value scales of a source bubbling method and a radon chamber sampling method, counting measurement, radon measurement in water, radium measurement in rock and radon measurement in gas.
The upper computer 3 controls the whole measuring process by setting parameters.
When the device works, the spherical scintillation chamber 5 needs to be rotated to a measurement position, the spherical scintillation chamber 5 at the measurement position is connected with the photomultiplier tube 4 through an organic glass optical window, alpha particles generated in the disintegration process of gas emitted and daughter in the spherical scintillation chamber 5 impact the ZnS-Ag scintillation material, the energy of the alpha particles is transferred to the ZnS-Ag scintillation material to cause the ZnS atoms to be ionized and excited to flash and emit photons, the photons are directly received by the photomultiplier tube 4 in work through the optical window or the optical window after being reflected by a reflecting layer, and a negative pulse voltage is output on an anode load resistor after being subjected to photoelectric conversion and multiplication; the negative pulse voltage signal is recorded by the single chip computer 24 after passing through the main amplifier, the differential circuit, the single channel and the forming circuit;
in the spherical scintillation chamber 5, the number of alpha particles is in direct proportion to the concentrations of the emanation and the daughter, and the concentrations of the emanation and the daughter in the spherical scintillation chamber 5 can be known by recording the pulse frequency output by the photomultiplier tube 4;
during radon measurement, the emanation is introduced into the spherical scintillation chamber 5 and then measured after 1-3 h, and the radon and the daughter are measured after reaching radioactive equilibrium approximately;
because the half-lives of radon and thorium are different, when measuring the thorium, flow velocity curves need to be measured respectively so as to determine the optimal flow velocity, so that the sensitivity is high, the measurement error is small, and the analysis result is reliable;
after the measurement is finished, exhausting gas for the scintillation chamber immediately to reduce pollution of the scintillation chamber;
the upper computer 3 can convert according to the calculated radon gas concentration and a related algorithm to obtain the concentration of the radium activity.
Claims (10)
1. The utility model provides a multichannel intelligence radon thorium analysis appearance which characterized in that: comprises a detector group (1), a measuring host (2) and an upper computer (3);
one, detector set (1)
The detector group (1) is composed of detector modules, and is configured according to requirements to form a multi-path detector module, specifically one of the following forms: the system comprises a 1-path detector module, a 2-path detector module and a 4-path detector module;
the detector module adopts an integrated module, and one detector module consists of three spherical scintillation chambers (5), a photomultiplier (4), a preamplifier (6) and a circular rotary platform (7);
the spherical scintillation chamber (5) is coupled and connected with a photocathode of the photomultiplier (4) through an organic glass optical window to provide a measurement gas source for the nuclear detection system;
each path of detector module is provided with 3 spherical scintillation chambers (5), only one spherical scintillation chamber (5) is subjected to alpha ray measurement, negative voltage pulse signals are output, mutual influence is avoided, and the other two spherical scintillation chambers (5) are subjected to gas emission standing at the same time;
second, measurement host (2)
The high-voltage power supply and the low-voltage power supply of the detector group module are provided by a high-voltage module (21) and a low-voltage module (22) in the measuring host (2), signals output by the detector module enter the measuring host (2) for processing, analyzing and recording, and the high voltage, the low voltage and the signals are connected through a high-frequency cable;
the measurement host (2) comprises a high-voltage module (21), a low-voltage module (22), a communication module (23), a single chip microcomputer (24) and a signal processing module consisting of a main amplifier module (25), a differential circuit (26), a single-channel module (27) and a forming circuit (28), and the measurement host (2) is used for amplifying, inverting and amplitude screening signals output by different paths of detector modules and then recording the number of rays;
the low-voltage module (22) converts 220V alternating voltage into a stable low-voltage power supply to ensure that the normal low-voltage working power supply of the measuring host and the detector group is ensured;
the high-voltage module (21) converts low voltage into high voltage required by the detector group;
the acquired nuclear signal information is transmitted to the upper computer (3) through the communication module (23), and serial port communication or internet access communication is adopted;
the whole working process is controlled by a singlechip (24);
the signal processing module comprises a main amplifier module (25), a differential circuit (26), a single-channel module (27) and a shaping circuit (28);
the main amplifier module (25) amplifies and inverts the signal output by the detector module 1 to make the signal meet the required requirement;
the differential circuit (26) is arranged in front of the single-channel module (27), the pulse width of the voltage output by the detector group (1) is within the range of 10-20 microseconds, the time constant of the differential circuit is within the range of 1-1.5 microseconds, and the amplitude of a signal is compensated by adjusting the amplification factor of the main amplifier module (25);
the single-channel module (27) eliminates dark current of a photomultiplier and nuclear electronics noise interference and discriminates the amplitude of a detector signal;
the forming circuit (28) is connected with the singlechip (24) and outputs a monostable signal to meet the requirement of subsequent digital circuit signal processing;
third, upper computer (3)
The upper computer (3) connects the measuring host (2) with the PC, counts, analyzes and processes the nuclear signals transmitted by the measuring host to obtain the radioactivity of the emanation, and stores, exports and prints the report forms of the data.
2. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: in the detector module, the model of the spherical scintillation chamber is ST-203, and the model of the photomultiplier (4) is GDB-44.
3. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the spherical scintillation chamber (5) is composed of two organic glass hemispheres with the inner surfaces coated with ZnS-Ag scintillation materials, two organic glass circular light guide clapboards which are perpendicular to each other and coated with ZnS-Ag coatings are arranged in the cavity of the scintillation chamber, and the interior of the spherical scintillation chamber (5) is divided into four chambers.
4. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the air outlet (35) and the air inlet (36) of the scintillation chamber are respectively communicated with two adjacent chambers, except that the partition plate between the two adjacent chambers is not provided with air holes, the air holes are arranged between the adjacent chambers and are respectively connected with the chambers on two sides, so that sample gas can be fully contacted with the four chambers and then discharged out of the scintillation chamber, and the effective detection sensitive volume of alpha particles generated by radon and radon daughters is improved.
5. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the scintillation ball is arranged in the metal protective shell, and the inner surface of the metal shell is a reflecting layer for improving the collection efficiency of scintillation light.
6. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the thickness of the ZnS-Ag scintillating material coating is 10mg/cm2The detection efficiency of alpha particles is 100%; the volume of the spherical scintillation chamber (5) is 0.5L.
7. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: standing for 1-3 hours after radon gas sampling is completed, then measuring, and rotating the spherical scintillation chamber (5) to a measurement position for alpha ray measurement after standing is completed, thereby realizing multi-path uninterrupted measurement.
8. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the upper computer (3) realizes the following functions according to the requirements of relevant industry standards and a method for measuring the radon chamber scales of a hospital: the method comprises five sample measurements of two K value scales of a source bubbling method and a radon chamber sampling method, counting measurement, radon measurement in water, radium measurement in rock and radon measurement in gas.
9. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the upper computer (3) controls the whole measuring process by setting parameters.
10. The multi-path intelligent radon-thorium analyzer of claim 1 further comprising: the spherical scintillation chamber (5) consists of two organic glass hemispheres with the inner surfaces coated with ZnS-Ag scintillation materials, two organic glass circular light guide clapboards which are perpendicular to each other and coated with ZnS-Ag coatings are arranged in a cavity of the scintillation chamber, and the interior of the spherical scintillation chamber (5) is divided into four chambers;
the gas outlet (35) and the gas inlet (36) are respectively communicated with two adjacent chambers, except that the partition plate between the two adjacent chambers has no gas hole, the other adjacent chambers are provided with gas holes and are respectively connected with the chambers at two sides, so that sample gas can be fully contacted with the four chambers and then discharged out of the scintillation chamber, and the effective detection sensitive volume of alpha particles generated by radon and radon daughter is improved;
the scintillation ball is arranged in the metal protective shell, and the inner surface of the metal shell is a reflecting layer for improving the collection efficiency of scintillation light;
the thickness of the ZnS-Ag scintillating material coating is 10mg/cm2The detection efficiency of alpha particles is 100%; the volume of the spherical scintillation chamber (5) is 0.5L;
standing for 1-3 hours after radon gas sampling is finished, then measuring, and rotating the spherical scintillation chamber (5) to a measurement position for alpha ray measurement after standing is finished, so that multi-path simultaneous uninterrupted measurement is realized;
the upper computer (3) realizes the following functions according to the requirements of relevant industry standards and a method for measuring the radon chamber scales of a hospital: the method comprises the following steps of (1) dividing two K values by a source bubbling method and a radon chamber sampling method, counting and measuring, measuring radon in water, measuring radium in rock and measuring gas radon;
the upper computer (3) controls the whole measuring process by setting parameters.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112817028A (en) * | 2020-12-29 | 2021-05-18 | 上海工物高技术产业发展有限公司 | Multichannel analyzer zero clearing method, device and system and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112817028A (en) * | 2020-12-29 | 2021-05-18 | 上海工物高技术产业发展有限公司 | Multichannel analyzer zero clearing method, device and system and storage medium |
| CN112817028B (en) * | 2020-12-29 | 2024-02-13 | 上海工物高技术产业发展有限公司 | Multichannel analyzer resetting method, multichannel analyzer resetting device, multichannel analyzer resetting system and storage medium |
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