CN2352969Y - Wide-range fast radiation measuring device using scintillation detector - Google Patents
Wide-range fast radiation measuring device using scintillation detector Download PDFInfo
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- CN2352969Y CN2352969Y CN 98247927 CN98247927U CN2352969Y CN 2352969 Y CN2352969 Y CN 2352969Y CN 98247927 CN98247927 CN 98247927 CN 98247927 U CN98247927 U CN 98247927U CN 2352969 Y CN2352969 Y CN 2352969Y
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- electric current
- radiation
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- scintillator
- photomultiplier
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- 230000005855 radiation Effects 0.000 title claims abstract description 34
- 239000000523 sample Substances 0.000 claims abstract description 19
- 230000004044 response Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 30
- 230000035945 sensitivity Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000005251 gamma ray Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005658 nuclear physics Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Abstract
Radiation measuring device includes the scintillation probe who comprises plastics scintillator and photomultiplier, adopts protective structure, changes photomultiplier bleeder circuit resistance value and detector output mode to adopt the electric current application scheme to low energy radiation sensitive material, periphery through covering the one deck to the scintillator, adopts measures such as high performance electric current-frequency converter, makes the utility model discloses an index such as measuring range, energy response, basic error, response time all obviously is superior to current level, therefore can be better satisfy the needs of quick radiation monitoring and radiation reconnaissance.
Description
The utility model relates to the measurement to radiation, specifically about a kind of quick radiation measurement assembly of wide-range that uses scintillation detector.
In the actinometry field that all kinds of rays such as nuclear radiation, X ray, gamma-rays are measured, have polytype detector.Wherein, ionic discharge type radiation detector is grown owing to its out-of-service time and is write down reasons such as gamma-ray efficient is low and can not satisfy the demand in modern nuclear physics research field, and scintillation detector have by comparison the response time short, measure advantages such as gamma-ray efficient height, the range of linearity be wide, continuous in recent years must the development and be widely used.
Along with the development and the progress of nuclear physics research work and nuclear undertaking, the gamma-ray efficient of needs measurement is higher, the response time is shorter, the better activity-sensing equipment of energy response.And the technical indicator that present existing detecting devices can reach: measurement range is about 2 μ Gy/h～200cGy/h, energy response is about 50Kev～2Mev, fundamental error and is about ± 20% etc. all can not satisfy the needs of real work.
For this reason, that the purpose of this utility model is is wideer at a kind of measurement range of above-mentioned not enough design of the prior art, the response time is shorter, higher to gamma-ray measurement efficient, energy response better, fundamental error is littler, antijamming capability is strong, working stability, radiation measurement assembly reliably.
For realizing above-mentioned purpose of design, the technical solution of the utility model is briefly described below:
Radiation measurement assembly of the present utility model includes the scintillation detector of being made up of the photomultiplier that plastic scintillant reaches and described scintillator is combined closely, and the technical characterictic of this radiation measurement assembly has:
(1) accepts to cover the material of one deck on the outside surface of radiation at described scintillator, thereby constitute compound scintillator the low-energy radiation sensitivity;
(2) adopt double-deck safeguard structure in the periphery of described scintillator, form by being mainly used in the internal layer lucifuge cover and the outer protective cover that improve the low energy response;
(3) the branch hydraulic circuit total resistance value that is used for to each electrode power supply of described photomultiplier is about 1/10th of an accepted value, wherein, between the photocathode and first dynode, between the last secondary dynode and the divider resistance value between afterbody dynode and the ground be 1.5～2 times of divider resistance value between other adjacent dynode;
(4) be used for the output current of described scintillation detector is transformed into electric current one frequency changer of corresponding pulses frequency, form by high input impedance broadband amplifying circuit and wide range of linearity electric current one frequency-conversion circuit;
(5) electric current utilization scheme is adopted in the output of described scintillation detector, and promptly the input circuit of electric current one frequency changer is connected in the output loop of described photomultiplier transit tube anode;
(6) output terminal of described electric current one frequency changer links to each other with the back level electronic-circuit device input end that comprises data processing unit and data presentation device.
Radiation measurement assembly of the present utility model further can comprise following technical characterictic:
(1) described electric current one frequency changer and scintillation detector structurally are made of one the formation scintillation probe, and described scintillation probe is connected to each other by electrical connectors and cable with back level electronic-circuit device and supply unit;
(2) described scintillation probe comprises high dose probe and low dosage probe, their output terminal is connected with the input end of data processing unit by switch, wherein, the lower portion of high dose probe measurement scope has one to overlap the zone with the high end parts of low dosage probe measurement scope;
(3) in the level electronic-circuit device of described back, also include data recording equipment.Radiation measurement assembly of the present utility model further also can comprise following technical characterictic:
(1) described material to the low-energy radiation sensitivity is ZnS (Ag);
(2) described internal layer lucifuge cover adopts engineering plastics, and the outer layer protection cover is an aluminium.
The measurement range of the utility model radiation measurement assembly is wide, total size can be striden 10 more than the order of magnitude, performances such as response time, fundamental error, energy response all obviously are better than the corresponding index of prior art, and antijamming capability is strong, working stability, reliable, can satisfy the needs of modern nuclear physics research work preferably, especially have more practical significance carrying out radiation detection under the nuclear emergency situation.
Below in conjunction with Figure of description the formation of the utility model radiation measurement assembly is done more detailed description, wherein:
Fig. 1 is a functional-block diagram of the present utility model;
Fig. 2 is the utility model scintillation detector cut-away section view;
Fig. 3 is the utility model photomultiplier bleeder circuit schematic diagrams at different levels;
Fig. 4 is the circuit theory diagrams of the utility model electric current one frequency changer.
At first referring to Fig. 1.In the drawings, with dotted line enclose fixed, include scintillation detector and electric current one frequency changer formed by scintillator and photomultiplier and represent scintillation probe at interior square frame.With dotted line enclose fixed include data processing unit, data presentation device or and pen recorder then represent back level electronic-circuit device at interior square frame.
Secondly referring to Fig. 2, in the drawings, sequence number 1 is represented the protective cover with protective action; 2 represent the lucifuge cover, may be made of by little material the dampen out to low-energy radiation, can shield the various stray lights that come from the outside, and have the effect that improves the low energy response again; 3 representatives are to the overcoat of low-energy radiation sensitive materials, in order to low energy response and the raising sensitivity that improves scintillator; 4 is plastic scintillant; 5 is ring flange, in order to fixing described protective cover and lucifuge cover; 6 for being used to press solidly the pressure ring of lucifuge cover; 7 and 8 are respectively the rubber cushion that plays sealing, black out effect on the relevant position; 9 is sleeve, is used for the protection of photomultiplier; 10 are the centering ring; 11 is photomultiplier itself.
Come now referring to Fig. 3, this figure is the formation that example is represented bleeder circuit with the GDB52LD type photomultiplier of selecting for use in the LDR probe again.Be noted that be to guarantee the overall premium properties of radiation measurement assembly, should select parameters such as sensitivity, dark current, enlargement factor, noise energy all to meet the requirements and temperature performance is good, the photomultiplier of working stability.In the drawings, R
1, R
13, R
14Value be R
2～R
121.5～2 times of each resistance value, the purpose that strengthens resistance R 1 are to improve the ability that first dynode is collected electronics, in order to improving sensitivity, and strengthen R
13, R
14Thereby purpose then be to enlarge its range of linearity for the capacity gauge that improves final stage dynode and anode.Heavy dose of rate is surveyed and the needs of wide-range in order to adapt to, and the all-in resistance of bleeder circuit should be got than fractional value, and the utility model suggestion bleeder circuit total resistance value is about 1/10th of an accepted value.
At last referring to Fig. 4, as an example, select for use LF411 type operational amplifier (or LF357, LF3140 type circuit) as high input impedance broadband amplifying circuit, then selecting constant current switch type LM311M type translation circuit for use as wide range of linearity electric current one frequency-conversion circuit, serves as that the master forms input impedance height, linear transformation wide ranges, error is little, antijamming capability is strong, the high-performance current of working stability one frequency changer with this two circuit devcie.The frequency response of this transducer is compared with existing homogeneous circuit can increase about two orders of magnitude, and nonlinearity then can reduce about order of magnitude.
Because electric current utilization scheme is adopted in scintillation detector output of the present utility model, this helps to improve energy response, strengthens antijamming capability, improves the accuracy of measuring and enlarges the range of linearity of measuring.
In the utility model, except that the data presentation device of being mentioned, also can comprise various types of data recording equipments, thereby when showing measured value, tested numerical value is automatically recorded also.
Require to have enough load capacity and temperature adaptation scope as the indivisible power unit of whole device (comprising the high and low pressure power supply), in certain load current and temperature range, the output voltage of power supply should have advantages of higher stability.
Use the utility model that radiation is measured, the high dose rate measurement range is realized separately in different measurement mechanisms respectively with the LDR measurement range, also they comprehensively can be realized in same measurement mechanism.For this reason, the high dose rate probe needs to link to each other with back level electronic-circuit device by switch with the output of LDR probe.Belonged to the content of prior art as for the concrete technical characterictic of switch, back level electronic circuit and power unit, will not describe at this.
By adopting above-mentioned various technological means.The main performance of radiation measurement assembly of the present utility model can reach:
Measurement range: 0.1 μ Gy/h～10000cGy/h, and can reach the scope of 11 orders of magnitude;
Energy response: 30Kev～3MeV;
Fundamental error: ± 10%;
Response time: below 1 second.
The radiation measurement assembly that use has above-mentioned performance carries out actinometry, can satisfy the needs of real work preferably, and especially to carrying out radiation detection under the nuclear emergency situation, airborne survey has more actual use value.
Claims (3)
1, a kind of radiation measurement assembly includes the scintillation detector of being made up of the photomultiplier that plastic scintillant reaches and described scintillator is combined closely, and it is characterized in that:
(1) accepts to cover the material of one deck on the outside surface of radiation at described scintillator, thereby constitute compound scintillator the low-energy radiation sensitivity;
(2) adopt double-deck safeguard structure in the periphery of described scintillator, form by being mainly used in the internal layer lucifuge cover and the outer protective cover that improve the low energy response;
(3) the branch hydraulic circuit total resistance value that is used for to each electrode power supply of described photomultiplier is about 1/10th of an accepted value, wherein, between the photocathode and first dynode, between the last secondary dynode and the divider resistance value between afterbody dynode and the ground be 1.5～2 times of divider resistance value between other adjacent dynode;
(4) be used for the output current of described scintillation detector is transformed into electric current one frequency changer of corresponding pulses frequency, form by high input impedance broadband amplifying circuit and wide range of linearity electric current one frequency-conversion circuit;
(5) electric current utilization scheme is adopted in the output of described scintillation detector, and promptly the input circuit of electric current one frequency changer is connected in the output loop of described photomultiplier transit tube anode;
(6) output terminal of described electric current one frequency changer links to each other with the back level electronic-circuit device input end that comprises data processing unit and data presentation device.
2, radiation measurement assembly as claimed in claim 1 is characterized in that:
(1) described electric current one frequency changer and scintillation detector structurally are made of one the formation scintillation probe, and described scintillation probe is connected to each other by electrical connectors and cable with back level electronic-circuit device and supply unit;
(2) described scintillation probe comprises high dose probe and low dosage probe, their output terminal is connected with the input end of data processing unit by switch, wherein, the lower portion of high dose probe measurement scope has one to overlap the zone with the high end parts of low dosage probe measurement scope;
(3) in the level electronic-circuit device of described back, also include data recording equipment.
3, radiation measurement assembly as claimed in claim 1 or 2 is characterized in that:
(1) described material to the low-energy radiation sensitivity is ZnS (Ag);
(2) described internal layer lucifuge cover adopts engineering plastics, and the outer layer protection cover is an aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98247927 CN2352969Y (en) | 1998-12-04 | 1998-12-04 | Wide-range fast radiation measuring device using scintillation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98247927 CN2352969Y (en) | 1998-12-04 | 1998-12-04 | Wide-range fast radiation measuring device using scintillation detector |
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| Publication Number | Publication Date |
|---|---|
| CN2352969Y true CN2352969Y (en) | 1999-12-08 |
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| CN 98247927 Expired - Fee Related CN2352969Y (en) | 1998-12-04 | 1998-12-04 | Wide-range fast radiation measuring device using scintillation detector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109606A (en) * | 2010-12-15 | 2011-06-29 | 西北核技术研究所 | Compensation type pulse X-ray detecting device with double scintillators |
| CN102608644A (en) * | 2008-11-18 | 2012-07-25 | 同方威视技术股份有限公司 | Radioactive substance monitoring system |
| CN102695966A (en) * | 2009-11-16 | 2012-09-26 | 圣戈本陶瓷及塑料股份有限公司 | Scintillation article |
| CN103135120A (en) * | 2011-11-30 | 2013-06-05 | 中国辐射防护研究院 | Measuring method and measuring device of regional gamma radiation based on silicon photomultiplier |
| CN105628715A (en) * | 2015-12-31 | 2016-06-01 | 中国科学院青海盐湖研究所 | Potassium measuring instrument of sodium iodide crystals of raw material potassium ores |
| CN107564794A (en) * | 2016-07-01 | 2018-01-09 | 张双喜 | A kind of mixed type photoelectric multiplier and its photomultiplier transit method |
| CN108169781A (en) * | 2017-11-27 | 2018-06-15 | 中核控制系统工程有限公司 | A kind of X- gammas dosage detection device |
| CN115453606A (en) * | 2022-09-23 | 2022-12-09 | 西北核技术研究所 | Real-time measurement method and prediction method for radiation resistance of scintillator |
-
1998
- 1998-12-04 CN CN 98247927 patent/CN2352969Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608644A (en) * | 2008-11-18 | 2012-07-25 | 同方威视技术股份有限公司 | Radioactive substance monitoring system |
| CN102695966A (en) * | 2009-11-16 | 2012-09-26 | 圣戈本陶瓷及塑料股份有限公司 | Scintillation article |
| CN102695966B (en) * | 2009-11-16 | 2015-08-05 | 圣戈本陶瓷及塑料股份有限公司 | Scintillation article |
| CN102109606A (en) * | 2010-12-15 | 2011-06-29 | 西北核技术研究所 | Compensation type pulse X-ray detecting device with double scintillators |
| CN103135120A (en) * | 2011-11-30 | 2013-06-05 | 中国辐射防护研究院 | Measuring method and measuring device of regional gamma radiation based on silicon photomultiplier |
| CN105628715A (en) * | 2015-12-31 | 2016-06-01 | 中国科学院青海盐湖研究所 | Potassium measuring instrument of sodium iodide crystals of raw material potassium ores |
| CN107564794A (en) * | 2016-07-01 | 2018-01-09 | 张双喜 | A kind of mixed type photoelectric multiplier and its photomultiplier transit method |
| CN108169781A (en) * | 2017-11-27 | 2018-06-15 | 中核控制系统工程有限公司 | A kind of X- gammas dosage detection device |
| CN115453606A (en) * | 2022-09-23 | 2022-12-09 | 西北核技术研究所 | Real-time measurement method and prediction method for radiation resistance of scintillator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |