CN104793228A - Real-time online gamma and electron absorbed dose rate testing system - Google Patents
Real-time online gamma and electron absorbed dose rate testing system Download PDFInfo
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- CN104793228A CN104793228A CN201510152975.0A CN201510152975A CN104793228A CN 104793228 A CN104793228 A CN 104793228A CN 201510152975 A CN201510152975 A CN 201510152975A CN 104793228 A CN104793228 A CN 104793228A
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Abstract
The invention provides a real-time online gamma and electron absorbed dose rate testing system which comprises a front-end dosimeter, a clamp, a radiation-resistant cable, a multichannel scanning card component, a current-voltage measuring device and a control computer containing recording and calculation software. A semiconductor diode sold on the market is used as the dosimeter which increases measuring precision and space resolution as compared with an ionization chamber dosimeter, dosimeter cost is lowered, the dosimeter is easy to replace, high-voltage bias is not needed, and the dosimeter is unaffected by air pressure. The real-time online gamma and electron absorbed dose rate testing system has the advantages that real-time online monitoring of absorbed dose rate is achieved, and the system is applicable to remote real-time monitoring of the absorbed dose rate of strong radiation fields such as a cobalt source radiation device, an electron beam radiation device and a nuclear power station; the system is good in radiation resistance, and multiple dosimeters can be assembled to the system so as to achieve multi-point measuring and data processing of the dose rate.
Description
Technical field
The invention belongs to Radiation monitoring field, be specifically related to a kind of real-time online γ, Electron dose rate test macro, be used for the Real-Time Monitoring of radiation field as dose rate detection system.
Background technology
All require in γ industrial irradiation device, Electron irradiation device, nuclear power station dose monitoring and material irradiation Performance Assessment to carry out precise monitoring to absorbed dose rate, thus ensure personal security or use as important scientific research information.For above-mentioned radiation source, adopting long-range real-time online absorbed dose rate detection system to monitor the absorbed dose rate of its inside, personnel can being prevented excessively close to damaging.
In existing high radiation field, the measurement of absorbed dose rate is multiplex takes into account ionization chamber dosimeter etc. to thermoluminescence, various chemical dose.Wherein, thermoluminescent dosemeter, chemical dosimeter need frequently to pick and place in test process, and follow-up data reading process is numerous and diverse, the tester requiring specialty has come, there is photoresponse speed slow, spatial resolution and measuring accuracy low, the shortcomings such as measurement result dispersion degree is large, frangible.In addition the restriction of thermoluminescence, chemical dosimeter metering system, these quantimeters cannot be used for the real-time online measuring of absorbed dose rate.At present, the dosage that can be used for on-line testing of comparative maturity counts ionization chamber dosimeter, but ionization chamber dosimeter need work under HVB high voltage bias, and when working in different regions, ionization chamber dosimeter must carry out pressure correction.For lower absorbed dose rate, ionization chamber dosimeter need increase detector volume to reach electronic equilibrium, causes its spatial resolution within the scope of LDR lower like this.In order to adapt to high radiation field absorbed dose rate on-line testing demand, Duo Jia ionization chamber manufacturer is proposed Online Transaction Processing, wherein outstanding with the Webline series of German PTW company release, multiple ionization chamber dosimeter is had to supply apolegamy, but this cover system can only gather a road signal, cannot integrated collection multiple signals, and with high costs.
In order to remover dose rate Online Transaction Processing high-tension apparatus, the ray responsiveness of further improving agent gauge, existing many research and development units devise the front end quantimeter of semiconductor devices as on-line testing now, name is called that the Chinese patent (publication number: CN 101872023 A) that the Chinese patent (publication number: CN 103715293 A) of " radiation detecting device based on SOI CMOS technology " and name are called " adopting the PMOS quantimeter of annular grid structure " all discloses the front end quantimeter of a kind of semiconductor devices as radiation detection, these semiconductor front end quantimeter precision are high, may be used to the accurate test of radiation dose rate, but because cost of manufacture is high, and semiconductor devices resistance to irradiation ability difference is fragile, make such semiconductor front end quantimeter replacement cost high, be unfavorable for promoting.
Name is called the Chinese patent (publication number: CN 101839989 A) of " the dose-rate remote Real time auto measure system based on constant current source ", name is called that the Chinese patent (publication number: CN 101839990 A) of " the dose-rate remote Real time auto measure system based on changes of threshold " all discloses the Online Transaction Processing that a kind of semiconductor is quantimeter, name is called that the disclosed radiation dose monitoring system of the Chinese patent (publication number: CN 102736097 A) of " remote radiation dose monitoring system " utilizes other materials as front end quantimeter, this system is front end quantimeter with NaI (T1) scintillation detector, and be integrated with wireless data transfer module and GPS module in front end.These inventions are all wished to adopt less module to realize the object of on-line testing dose rate, but these designs cannot be applied in high radiation field, because these inventions are all integrated with electronic module and are used for realizing location, remote data transmission function in the quantimeter of front end, electronic module in high radiation field due to its radiation vulnerable most probably radiation at once lost efficacy or make mistakes, cause whole test crash.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a set of real-time online γ, Electron dose rate test macro.In strong radiation environment, system energy remote detection of the present invention the absorbed dose rate of γ, electron beam in real time record radiation field, can realize the multimetering of dose rate.
Technical scheme of the present invention is achieved in that
Real-time online γ of the present invention, Electron dose rate test macro comprise front end dosage and take into account fixture, radiation resistant cable, hyperchannel scanning card assembly, current-voltage measurement mechanism, manipulation computing machine containing record and software for calculation.Described front end dosage is taken into account fixture, radiation resistant cable, hyperchannel scanning card assembly, current-voltage measurement mechanism, is connected successively containing the manipulation computing machine of record and software for calculation.
Described current-voltage measurement mechanism is connected by data-interface and manipulation computing machine.
Described front end dosage counts the one in silicon, gallium arsenide, manufacturing silicon carbide semiconductor diode.
Described radiation resistant cable is three coaxial radio-frequency low loss cables.
Port number >=2 of described hyperchannel scanning card assembly.
Voltage accuracy≤the 1nV of described current-voltage measurement mechanism, current precision≤1fA.
Described current-voltage measurement mechanism is the one in electrometer, multimeter, digital sourcemeter.
Real-time online γ of the present invention, Electron dose rate test macro can be distinguished or simultaneously record current and voltage, and recordable curtage quantity >=1, the minimum interval of record current and voltage is 1 microsecond.
Be selected from first generation semiconductor material, second generation semiconductor material and third generation semiconductor material as the material of main part in the semiconductor diode of front end quantimeter in the present invention, semiconductor diode is preferably from silicon, gallium arsenide and manufacturing silicon carbide semiconductor diode.Semiconductor diode is realized absorbed dose rate detection and is realized by PN junction photoelectric effect.Such as, incident light is radiated at the photosurface P district of PN junction, and when incident light energy is greater than material energy gap, the near surface in P district will produce electron-hole pair.The two all spreads to PN junction area direction.Due to the effect of interface built in field, the side, P district of PN junction area can only be stayed in hole, and electronics is then pulled to the side, N district of PN junction area.As a result, width of depletion region narrows, contact potential difference reduces.Compare when contact potential difference at this moment and thermal equilibrium, namely its decrease is that photovoltaic electric potential is poor, and incident luminous energy is just transformed to electric energy.When external circuit short circuit, electric current is just had to flow through PN junction.Like this, just achieve the separation of electron-hole pair, form photogenerated current I
p.
Highly sensitive in gas detector and scintillation detector to ray of semiconductor material in semiconductor diode, than the ionization chamber that also can be used as real-time online measuring detector, it does not need high pressure, there is not pressure correction problem, the very little device of volume can be prepared into as required simultaneously, than its spatial resolution of ionization chamber that sensitivity is identical can do higher, can be used as excellent absorbed dose rate detector and be applied in real-time online absorbed dose rate test macro.
Low-loss radiation resistant cable in the present invention is three coaxial radio-frequency low loss cables, its length sets according to actual needs, namely to meet length requirement, the loss of the current-voltage that cable length brings must be considered again, so its length setting principle is: short as much as possible when meeting the demands.
Hyperchannel scanning card in the present invention is used for realizing multiplexed signal sampling, its port number >=2, each passage and a front end quantimeter and radiation resistant cable is corresponding arranges.
Data-interface of the present invention is selected from IEEE488 interface, RS232 interface or network interface.
Real-time online γ of the present invention, Electron dose rate test macro can record current-voltage way >=1.
Radiation resistant cable in the present invention and front end quantimeter one_to_one corresponding, the electric current produced for transfer agent gauge and voltage signal.
There is regular response to ray in front end quantimeter, the electric current that it produces under actinism becomes certain funtcional relationship with voltage with absorbed dose rate, by measuring electric current and voltage, according to funtcional relationship, obtains absorbed dose rate value.
Hyperchannel scanning card assembly of the present invention gathers while realizing multiple signals.
Front end dosage in the present invention is taken into account fixture and is comprised several front ends quantimeter and the corresponding several fixtures arranged.Fixture is used for laying front end quantimeter, at least one quantimeter can be laid, the front end of fixture is mated with front end quantimeter both positive and negative polarity, fixture rear end and radiation resistant cable coupling, the photogenerated current facilitating quantimeter to produce and voltage are imported in current-voltage measurement mechanism by radiation resistant cable cable and hyperchannel scanning card assembly.
Current-voltage measurement mechanism in the present invention reads for measuring the photogenerated current and voltage that front end quantimeter produces, and electric current and voltage value and time sequence information thereof to be sent to containing noting down and the manipulation computing machine of software for calculation according to the instruction of record and software for calculation operational order.
The manipulation computing machine containing record and software for calculation in the present invention can remote control current-voltage measurement mechanism, assigns self-inspection order, complete the setting of measurement parameter to it, allows the multiple signals circulation measurement that it transmits hyperchannel scanning card assembly.Record and software for calculation carry out real time record to electric current and voltage data, and graphically show electric current, voltage and absorbed dose rate in real time over time with data mode.
The invention has the beneficial effects as follows:
1) the present invention is by semiconductor diode finished product as front end quantimeter, and than ionization chamber dosimeter, improve measuring accuracy and spatial resolution, reduce quantimeter cost, its cost can be low to moderate 0.1 yuan;
2) front end quantimeter is easy to change, and does not need HVB high voltage bias, not by barometric pressure effect;
3) front end fixture is not containing easy radiation damage element, and reading device is away from radiation source, makes this cover system have good resistance to irradiation ability;
4) by separate clamps, radiation resistant cable, hyperchannel scanning card, current-voltage measurement mechanism, data-interface, containing noting down and the coupling of manipulation computing machine of software for calculation, achieve the real time and on line monitoring of absorbed dose rate, can be used for the remote real time monitoring of the high radiation field absorbed dose rates such as cobalt-60 radiosterilize device, electron beam irradiation, nuclear power station, also can be used for other needs real-time follow-up to monitor the weak radiation field of absorbed dose rate;
5) real-time online γ of the present invention, Electron dose rate test macro configurable multiple front ends quantimeter, can carry out multipoint acquisition and the data processing of dose rate, spatial resolution is high, simple to operate.
Accompanying drawing explanation
Fig. 1 is real-time online γ of the present invention, Electron dose rate test system structure schematic diagram;
Fig. 2 is the schematic diagram of record in the present invention and software for calculation;
Fig. 3 is the absorbed dose rate-electric current corresponding relation figure in the present invention;
In figure, 1. front end quantimeter and fixture 2. radiation resistant cable 3. hyperchannel scanning card assembly 4. current-voltage measurement mechanism 5. contain the manipulation computing machine of record and software for calculation.
Embodiment
In order to explain enforcement of the present invention more fully, the present invention will be described to provide following embodiment.These embodiments are only explain and do not limit the scope of the invention.
Embodiment 1
Below in conjunction with Fig. 1 ~ Fig. 3, the real-time in-line testing system of a kind of γ of measurement absorbed dose rate of the present invention is described.
Fig. 1 is real-time online γ of the present invention, Electron dose rate test system structure schematic diagram.Fig. 2 is the schematic diagram of record in the present invention and software for calculation, and this software realizes according to step (1) ~ (5) function showing electric current, voltage and absorbed dose rate in real time successively.Fig. 3 is the absorbed dose rate-electric current corresponding relation figure in the present invention, absorbed dose rate corresponding relation figure in the silicon diode quantimeter photogenerated current of two same model that display embodiment 1 medium-long range Online Transaction Processing is measured and gamma radiation field, in figure, horizontal ordinate is absorbed dose rate, unit is Gy/min, ordinate is photogenerated current, and unit is nA.In Fig. 1 ~ Fig. 3, real-time online γ of the present invention, Electron dose rate test macro comprise front end dosage and take into account fixture 1, radiation resistant cable 2, hyperchannel scanning card assembly 3, current-voltage measurement mechanism 4, manipulation computing machine 5 containing record and software for calculation.Described front end dosage is taken into account fixture 1, radiation resistant cable 2, hyperchannel scanning card assembly 3, current-voltage measurement mechanism 4, is connected successively containing the manipulation computing machine 5 of record and software for calculation.
Described current-voltage measurement mechanism 4 is connected by data-interface and manipulation computing machine 5.
Described front end dosage counts the one in silicon, gallium arsenide, manufacturing silicon carbide semiconductor diode.
Described radiation resistant cable 2 is three coaxial radio-frequency low loss cables.
Port number >=2 of described hyperchannel scanning card assembly 3.
Voltage accuracy≤the 1nV of described current-voltage measurement mechanism 4, current precision≤1fA.
Described current-voltage measurement mechanism 4 is the one in electrometer, multimeter, digital sourcemeter.
In the present embodiment, semiconductor diode selected by front end quantimeter in front end quantimeter and fixture 1, for the optical semiconductor battery that commercially available photosurface is 4mm × 4mm, select 50 meters long low loss RF cables as radiation resistant cable 2, select the hyperchannel scanning card assembly 3 of ten passages, select electrometer as current-voltage measurement mechanism 4, with IEEE488 card for data-interface, manipulation computing machine 5 containing record and software for calculation selects the software of autonomous establishment for record and software for calculation, tests the absorbed dose rate of industrial cobalt-60 radiosterilize device irradiation field.
In Fig. 2, the manipulation computing machine 5 containing record and software for calculation first sends instruction to electrometer, the self-inspection of order electrometer, guarantees electric current, voltage value accurate and effective that electrometer measurement obtains.After electrometer self-inspection completes, the manipulation computing machine 5 containing record and software for calculation sends designated command electrometer and selects corresponding hyperchannel to scan card assembly port number, and the passage selected in this embodiment is passage one and passage two.Manipulate electrometer and hyperchannel containing record and the manipulation computing machine 5 of software for calculation to scan card assembly and gather the electric current of passage one and passage two, information of voltage.Before operator does not input termination order, manipulation computing machine 5 containing record and software for calculation constantly sends instruction to electrometer, manipulation electrometer is to the electric current of passage one and passage two, information of voltage gathers, and according to the electric current of time series successively cycle index passage one and passage two, magnitude of voltage, according to the silicon diode quantimeter photogenerated current of two same model, absorbed dose rate respective function in voltage and gamma radiation field, record in the present embodiment and software for calculation are by calculating conversion, with the absorbed dose rate value of any point in chart and data mode display gamma radiation field.
Embodiment 2
Record in the system architecture of the present embodiment, system is identical with embodiment 1 with software for calculation.In the present embodiment, it is front end quantimeter that front end quantimeter and fixture select commercially available surface area to be the Schottky silicon carbide diode of 1mm × 1mm, select 30 meters long low loss RF cables as radiation resistant cable, select the hyperchannel scanning card assembly on 20 tunnels, select digital sourcemeter as current-voltage measurement mechanism, using RS232 wiring as signal transmission interface, manipulation computing machine containing record and software for calculation selects the software of autonomous establishment for record and software for calculation, test the absorbed dose rate of industrial electronic bundle irradiation devices irradiation field, by calculating conversion, can the direct absorbed dose rate value of any point in reading beam radiation field.
Embodiment 3
Record in the system architecture of the present embodiment, system is identical with embodiment 1 with software for calculation.In the present embodiment, front end quantimeter and fixture select commercially available gallium arsenide diode to be front end quantimeter, select matched clamp, using 50 meters long low loss RF cables as radiation resistant cable, select three road hyperchannel scanning card assemblies, select digital sourcemeter as current-voltage measuring equipment, using network interface as signal transmission interface, manipulation computing machine containing record and software for calculation selects the software of autonomous establishment for record and software for calculation, for the real-time change of the current-voltage of semiconductor test in gamma radiation field.
Claims (7)
1. real-time online γ, an Electron dose rate test macro, is characterized in that: described system comprise front end dosage take into account fixture (1), radiation resistant cable (2), hyperchannel scanning card assembly (3), current-voltage measurement mechanism (4), containing record and the manipulation computing machine (5) of software for calculation; Described front end dosage is taken into account fixture (1), radiation resistant cable (2), hyperchannel scanning card assembly (3), current-voltage measurement mechanism (4), is connected successively containing the manipulation computing machine (5) of record and software for calculation.
2. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: described current-voltage measurement mechanism (4) is connected by data-interface and manipulation computing machine (5).
3. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: described front end dosage counts the one in silicon, gallium arsenide, manufacturing silicon carbide semiconductor diode.
4. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: described radiation resistant cable (2) is three coaxial radio-frequency low loss cables.
5. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: port number >=2 of described hyperchannel scanning card assembly (3).
6. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: the voltage accuracy≤1nV of described current-voltage measurement mechanism (4), current precision≤1fA.
7. real-time online γ according to claim 1, Electron dose rate test macro, is characterized in that: described current-voltage measurement mechanism (4) is electrometer, one in multimeter, digital sourcemeter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259565A (en) * | 2015-09-17 | 2016-01-20 | 中国工程物理研究院电子工程研究所 | Laser simulation system for semiconductor device radiation dose rate effect |
| CN105807305B (en) * | 2016-05-17 | 2018-12-28 | 中国工程物理研究院电子工程研究所 | A kind of double-wavelength pulse laser radiation dose rate effect analog system |
| CN110221336A (en) * | 2019-06-24 | 2019-09-10 | 中国科学院新疆理化技术研究所 | A kind of multimetering method based on PMOS dosimeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259565A (en) * | 2015-09-17 | 2016-01-20 | 中国工程物理研究院电子工程研究所 | Laser simulation system for semiconductor device radiation dose rate effect |
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| CN110221336A (en) * | 2019-06-24 | 2019-09-10 | 中国科学院新疆理化技术研究所 | A kind of multimetering method based on PMOS dosimeter |
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