CN104536028A - On-site calibration device of airborne tritium monitoring instrument - Google Patents
On-site calibration device of airborne tritium monitoring instrument Download PDFInfo
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- CN104536028A CN104536028A CN201510019954.1A CN201510019954A CN104536028A CN 104536028 A CN104536028 A CN 104536028A CN 201510019954 A CN201510019954 A CN 201510019954A CN 104536028 A CN104536028 A CN 104536028A
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Abstract
The invention discloses an on-site calibration device of an airborne tritium monitoring instrument. The on-site calibration device of the airborne tritium monitoring instrument comprises an air processor, a bubbling unit, a transmission instrument, an aspirator pump and a recovery unit, all of which are sequentially connected, wherein the air processor is used for filtering and drying inlet air, the bubbling unit is used for bubbling tritiated water to form saturated tritium flow, the transmission instrument is used for being connected with a calibrated detection instrument and measuring the activity and concentration of the tritium flow generated on site, the aspirator pump is used for pumping the tritium flow into the recovery unit for recovery after the activity and concentration of the tritium flow generated on site are detected, and the recovery unit is used for cooling and recovering the recovered tritium flow. The ranges of the activity and concentration of the tritium flow generated by the on-site calibration device of the airborne tritium monitoring instrument in a bubbling mode depend on the total activity of the tritium flow for bubbling and can meet the calibration of most existing nuclear facilities using the measuring span of the tritium monitoring instrument. The uncertainty of the synthesis standard of the activity and concentration of the bubbled tritium flow is less than or equal to 10 percent, and the recovery rate of the tritiated water vapor by the recovery unit is more than 99 percent.
Description
Technical field
The present invention relates to ionising radiation metering field, specifically gas carries the field calibration device of tritium monitor.
Background technology
The nuclear facilities such as military isotope, nuclear fuel manufacture and usage, reactor, nuclear power station can discharge gaseous state tritium in running.These gaseous state tritiums can bring radiation hazard and environmental pollution to personnel on the one hand, and on the other hand, the discharge capacity of gaseous state tritium is again the important evidence of nuclear facilities operation and environmental safety assessment.At present, existing multiple nuclear facilities and radiation work place have been installed gas and have been carried tritium monitor.For such monitor, according to " Measurement Law of the People's Republic of China ", belong to compulsory verification category, periodic calibration (or calibration) must be carried out.But also do not set up corresponding standard and technical manual due to domestic, the calibration operation that gas carries tritium monitor is not also carried out, and the accuracy of its measurement result can not be guaranteed.In addition, in nuclear facilities, gas carries the part of tritium monitor as process monitoring system, after rigging up and debugging runs, owing to there is the reasons such as pollution after inconvenience dismounting and operation, can not deliver to laboratory and carry out magnitude tracing, can only carry out field calibration.
Through new patent searching, the field calibration technology that gas carries tritium monitor is also in conceptual phase, does not retrieve anyly to have the literature record that similar functions gas carries the field calibration device of tritium monitor.
Summary of the invention
The object of the present invention is to provide and be a kind ofly applied to the field calibration device that gas carries tritium monitor, solve current gas and carry the problem that its value of tritium monitor is difficult to trace to the source, protect its monitoring result accurately and reliability.
Object of the present invention is achieved through the following technical solutions:
Gas carries the field calibration device of tritium monitor, comprise connect successively air processor, bubbling unit, transmit instrument, aspiration pump and recovery unit, wherein: air processor: for filter the air entered and dry; Bubbling unit: for the bubbling of HTO, forms saturated tritium gas stream; Transmit instrument: for be calibrated detector and be connected in series, and the tritium gas stream activity concentration of scene generation to be measured; Aspiration pump: for tritium gas stream bubbling, and tritium gas stream suction recovery unit is carried out recovery power is provided; Recovery unit: the tritium gas stream of recovery is carried out cooling and reclaim.In system of the present invention, the effect of air processor is filtered air and drying, then be passed into bubbling unit and carry out bubbling, formed saturated tritium gas stream flow to transmit instrument measure, by aspiration pump, tritium gas stream is delivered to recovery unit after Measurement and calibration and carries out HTO recovery, system of the present invention is utilized to carry out the process of field calibration as follows: first to calibrate transmission instrument in laboratory, obtain calibration factor, then the transmission instrument calibrated is utilized to measure the tritium gas stream activity concentration that scene produces, survey measurements is multiplied by calibration factor can obtain on-the-spot tritium gas stream activity concentration conventional true value, re-use and by school tritium monitor, the tritium gas stream activity concentration that scene produces is measured, obtain a measured value, finally by on-the-spot tritium gas stream activity concentration conventional true value with carried the measured value that tritium monitor measurement obtains by school gas and contrast, its ratio is by the calibration factor of school instrument, the field calibration device that gas of the present invention carries tritium monitor bloats tritium gas stream activity concentration scope: depend on bubbling HTO total activity, can meet the current nuclear facilities of major part in the calibration of measuring range with tritium monitor, bloat tritium gas stream activity concentration combined standard uncertainty :≤10%, recover can reach more than 99% to the organic efficiency of tritiated water steam.
Described air processor comprises conical filtrator, has filtering membrane in filtrator, and the outlet of filtrator connects exsiccator, and the two ends of exsiccator are connectivity port.Concretely, air processor comprises filtrator, conically, its base diameter is large and be provided with mesh plate for filtrator, and mesh plate installs filtering membrane, filtering membrane is positioned at entrance one end of exsiccator, exsiccator is cylindrical-shaped structure, and its two ends are heap pyramidal structure, for being connected with pipeline, by filtering and drying, air can meet the needs of experiment.
Described filtrator adopts stainless steel to make, and filtering membrane employing mesh is that the all-glass paper of 0.5 μm is made; Employing discolour silica gel in exsiccator and molecular sieve are as drying agent.Concretely, filtrator adopts stainless steel to make, have good plasticity, its any surface finish, is not easily stained with ash, easy to use, mesh be the all-glass paper of 0.5 μm as filtering membrane, there is good filtration capacity, the suspended particle in empty rising can be removed, discolour silica gel and molecular sieve, as drying agent, can adsorb the less particle of particle diameter and hydrone.
Bubbling unit comprises thermostatic container, and is immersed in the bubbler in thermostatic container, and bubbler comprises the outer tube of suit, interior pipe, and wherein, pipe is communicated with air processor, and its end is provided with bubbling ball, and bubbling ball is evenly distributed with multiple bubble holes; Outer tube top is communicated with transmission instrument by escape pipe.Further say, bubbler is used for the bubbling of HTO, it is the most crucial part of field calibration device, also be the difficult point in whole technical scheme, whether the rationality of bubbler structure directly determines can bubbling success, through years of researches and experiment, finally the bubbler structure of this programme has been produced, bubbling mode from inside to outside, not only increase the contact area of gas and HTO, and improve the volatilization area of HTO, be conducive to formed protect and HTO steam, the structure of bubbling ball can make the diffusional area of gas increase, thus improve the efficiency of its bubbling.
Described bubbler adopts oxygen-free copper to make, all gold-plated formation Gold plated Layer of the inside and outside wall of wall, interior pipe within the outer tube.Further, according to function and the working environment of bubbler, through experiment repeatedly and long-term theoretical analysis, applicant has selected good material: oxygen-free copper is to make bubbler, utilize it to the characterization of adsorption of tritium and the physical characteristics such as heat-conduction coefficient, hardness, the saturated air-flow that concentration is higher can be obtained.
The diameter of described bubble holes is 0.5 mm.
Described recovery unit comprises liquid nitrogen condensation device and recover, and recover comprises the urceolus, the inner core that are set with successively, and wherein urceolus is connected with aspiration pump, is communicated with bottom urceolus with inner core, and inner core extends urceolus top as gas outlet.Further, because tritium gas stream is with radioactivity, directly can not be discharged into outdoor, the Operation system setting of the present invention recovery unit of tritium gas stream, reclaimed by recover, and be stored in liquid nitrogen condensation device, the employing air intake opening of recover is large, to give vent to anger young mode, and adopt the mode that little cylindrical interior bucket is set in large cylindrical outer barrel to increase the path of gas process, thus add the process of cooling, ensure that the condensation of tritium gas stream stores, liquid nitrogen condensation device is used for low temperature underwater recovery air state tritium, and heat-insulating property is good.
Described recover adopts and makes through the glass of annealing in process.Adopt the glass recover through annealing process process, be not only convenient to observe inner condensation situations, and be suitable for the working environment of low temperature, there will not be and break.
The present invention compared with prior art, has following advantage and beneficial effect:
1 gas of the present invention carries the field calibration device of tritium monitor, and the field calibration device that gas carries tritium monitor bloats tritium gas stream activity concentration scope: depend on bubbling HTO total activity, can meet the current nuclear facilities of major part in the calibration of measuring range with tritium monitor; Bloat tritium gas stream activity concentration combined standard uncertainty :≤10%; Recover can reach more than 99% to the organic efficiency of tritiated water steam;
2 gas of the present invention carry the field calibration device of tritium monitor, bubbling mode from inside to outside, not only increase the contact area of gas and HTO, and improve the volatilization area of HTO, be conducive to forming saturated HTO steam, the structure of bubbling ball can make the diffusional area of gas increase, thus improves the efficiency of its bubbling;
3 gas of the present invention carry the field calibration device of tritium monitor, reclaimed by recover, and be stored in liquid nitrogen condensation device, the employing air intake opening of recover is large, young mode of giving vent to anger, and adopts the mode arranging little cylindrical interior bucket in large cylindrical outer barrel to increase the path of gas process, thus add the process of cooling, ensure that the condensation of tritium gas stream stores, liquid nitrogen condensation device is used for low temperature underwater recovery air state tritium, and heat-insulating property is good.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram.
Mark and corresponding parts title in accompanying drawing:
1-air processor, 11-filtrator, 12-filtering membrane, 13-exsiccator, 2-bubbling unit, 21-thermostatic container, 22-outer tube, 23-interior pipe, 24-bubbling ball, 25-escape pipe, 3-transmit instrument, 4-aspiration pump, 5-recovery unit, 51-liquid nitrogen condensation device, 52-urceolus, 53-inner core, 6-be calibrated detector.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Schematic diagram as shown in Figure 1, gas carries the field calibration device of tritium monitor, comprise the air processor 1 connected successively, bubbling unit 2, transmit instrument 3, aspiration pump 4, and recovery unit 5, wherein: air processor 1 comprises filtrator 11, filtrator 11 conically, its base diameter is large and be provided with mesh plate, employing stainless steel is made, it is that the all-glass paper of 0.5 μm is as filtering membrane 12 that mesh plate is installed mesh, filtering membrane 12 is positioned at entrance one end of exsiccator 13, exsiccator 13 is cylindrical-shaped structure, diameter about 5 cm, be about 37cm, interface internal thread is 12mm, plexi-glass tubular and aluminium is adopted to make, its two ends are heap pyramidal structure, for being connected with pipeline, the drying agent of exsiccator 13 inside is discolour silica gel and molecular sieve: the output of exsiccator 13 is communicated to bubbling unit 2, bubbling unit 2 comprises thermostatic container 21, and the bubbler be immersed in thermostatic container 21, in order to reduce the volume and weight of whole device, have selected BL500 type semiconductor thermostat, this thermostat constant-temperature precision is ± 0.04 DEG C, as calculated, under this precision, on the impact of generator saturation water mass change below 0.5%, bubbler comprises outer tube 22, the interior pipe 23 of suit, wherein interior pipe 23 is communicated with exsiccator 13, its end is provided with bubbling ball 24, bubbling ball 24 is evenly distributed with the bubble holes that multiple diameter is 0.5mm, bubbler adopts oxygen-free copper to make, in all gold-plated formation Gold plated Layer of the inside and outside wall of outer tube 22 inwall, interior pipe 23, outer tube 22 diameter is about 4cm, is about 38cm, bubbling end is spherical, and diameter is about 15mm, and bubbling ball 24 has been covered with bubble holes uniformly, diameter about 0.5 mm in hole, outer tube 22 top is communicated with transmission instrument 3 by escape pipe, transmit instrument 3 for be calibrated detector 6 and be connected, and the tritium gas stream activity concentration that scene produces to be measured, after the tritium gas stream activity concentration at scene is detected, with aspiration pump 4, tritium gas stream suction recovery unit 5 is reclaimed, recovery unit 5 comprises liquid nitrogen condensation device 51 and recover, and adopt the structure of liquid nitrogen condensation device 51, liquid nitrogen capacity is 10L, and use and prove, condenser heat-insulating property is good, recover adopts the glass of annealed technique to make, and recover comprises the urceolus 52, the inner core 53 that are set with successively, urceolus 52 diameter 5cm, inner core 53 diameter 1cm, wherein urceolus 52 is connected with aspiration pump 4, is communicated with bottom urceolus 52 with inner core 53, and inner core 53 extends urceolus 52 top as gas outlet.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention, every according in technical spirit of the present invention to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.
Claims (8)
1. gas carries the field calibration device of tritium monitor, it is characterized in that: comprise connect successively air processor (1), bubbling unit (2), transmit instrument (3), aspiration pump (4) and recovery unit (5), wherein:
Air processor (1): for filtering the air entered and drying;
Bubbling unit (2): for the bubbling of HTO, forms saturated tritium gas stream;
Transmit instrument (3): for be calibrated detector (6) and be connected, and the tritium gas stream activity concentration of scene generation to be measured;
Aspiration pump (4): for tritium gas stream bubbling, and recovery is carried out in tritium gas stream suction recovery unit (5) power is provided;
Recovery unit (5): the tritium gas stream of recovery is carried out cooling and reclaim.
2. gas according to claim 1 carries the field calibration device of tritium monitor, it is characterized in that: described air processor (1) comprises conical filtrator (11), there is in filtrator (11) filtering membrane (12), the outlet of filtrator (11) connects exsiccator (13), and the two ends of exsiccator (13) are connectivity port.
3. gas according to claim 2 carries the field calibration device of tritium monitor, it is characterized in that: described filtrator (11) adopts stainless steel to make, and filtering membrane (12) employing mesh is that the all-glass paper of 0.5 μm is made; Employing discolour silica gel in exsiccator (13) and molecular sieve are as drying agent.
4. gas according to claim 1 carries the field calibration device of tritium monitor, it is characterized in that: bubbling unit (2) comprises thermostatic container (21), and the bubbler be immersed in thermostatic container (21), bubbler comprises the outer tube (22) of suit, interior pipe (23), wherein, pipe (23) is communicated with air processor (1), its end is provided with bubbling ball (24), and bubbling ball (24) is evenly distributed with multiple bubble holes; Outer tube (22) top is communicated with transmission instrument (3) by escape pipe (25).
5. gas according to claim 4 carries the field calibration device of tritium monitor, it is characterized in that: described bubbler adopts oxygen-free copper to make, in all gold-plated formation Gold plated Layer of inside and outside wall of outer tube (22) inwall, interior pipe (23).
6. gas according to claim 4 carries the field calibration device of tritium monitor, it is characterized in that: the diameter of described bubble holes is 0.5 mm.
7. gas as claimed in any of claims 1 to 6 carries the field calibration device of tritium monitor, it is characterized in that: described recovery unit (5) comprises liquid nitrogen condensation device (51) and recover, recover comprises the urceolus (52), the inner core (53) that are set with successively, wherein urceolus (52) is connected with aspiration pump (4), urceolus (52) bottom is communicated with inner core (53), and inner core (53) extends urceolus (52) top as gas outlet.
8. gas according to claim 7 carries the field calibration device of tritium monitor, it is characterized in that: described recover adopts and makes through the glass of annealing in process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510019954.1A CN104536028A (en) | 2015-01-15 | 2015-01-15 | On-site calibration device of airborne tritium monitoring instrument |
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| CN201510019954.1A CN104536028A (en) | 2015-01-15 | 2015-01-15 | On-site calibration device of airborne tritium monitoring instrument |
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Cited By (7)
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| CN105203717A (en) * | 2015-10-22 | 2015-12-30 | 中国核动力研究设计院 | Inert gas monitor field calibration device and application method thereof |
| CN107015266A (en) * | 2017-05-22 | 2017-08-04 | 中国原子能科学研究院 | A kind of calibration system and its scaling method of flow gas environment ion-chamber tritium concentration monitor |
| CN109406711A (en) * | 2018-10-17 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of device for absorbing tail gas and its tail gas absorption method for SCR denitration performance detection |
| CN110308477A (en) * | 2019-05-30 | 2019-10-08 | 中核核电运行管理有限公司 | A method of it is demarcated using γ solid source to tritium ionisation chamber is surveyed |
| CN114624759A (en) * | 2022-04-11 | 2022-06-14 | 中国人民解放军火箭军工程大学 | Closed circulation loop-based on-site calibration method for tritium monitor in air |
| CN114879245A (en) * | 2022-04-11 | 2022-08-09 | 中国人民解放军火箭军工程大学 | On-spot calibrating device of tritium monitor in air based on closed circulation circuit |
| CN114879246A (en) * | 2022-04-11 | 2022-08-09 | 中国人民解放军火箭军工程大学 | Multi-concentration tritiated steam generation method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203717A (en) * | 2015-10-22 | 2015-12-30 | 中国核动力研究设计院 | Inert gas monitor field calibration device and application method thereof |
| CN105203717B (en) * | 2015-10-22 | 2017-08-25 | 中国核动力研究设计院 | Inert gas monitor field calibration device and its application process |
| CN107015266A (en) * | 2017-05-22 | 2017-08-04 | 中国原子能科学研究院 | A kind of calibration system and its scaling method of flow gas environment ion-chamber tritium concentration monitor |
| CN109406711A (en) * | 2018-10-17 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of device for absorbing tail gas and its tail gas absorption method for SCR denitration performance detection |
| CN110308477A (en) * | 2019-05-30 | 2019-10-08 | 中核核电运行管理有限公司 | A method of it is demarcated using γ solid source to tritium ionisation chamber is surveyed |
| CN110308477B (en) * | 2019-05-30 | 2023-01-24 | 中核核电运行管理有限公司 | Method for calibrating tritium measuring ionization chamber by using gamma solid source |
| CN114624759A (en) * | 2022-04-11 | 2022-06-14 | 中国人民解放军火箭军工程大学 | Closed circulation loop-based on-site calibration method for tritium monitor in air |
| CN114879245A (en) * | 2022-04-11 | 2022-08-09 | 中国人民解放军火箭军工程大学 | On-spot calibrating device of tritium monitor in air based on closed circulation circuit |
| CN114879246A (en) * | 2022-04-11 | 2022-08-09 | 中国人民解放军火箭军工程大学 | Multi-concentration tritiated steam generation method |
| CN114879246B (en) * | 2022-04-11 | 2022-11-08 | 中国人民解放军火箭军工程大学 | Multi-concentration tritiated water vapor generation method |
| CN114624759B (en) * | 2022-04-11 | 2022-11-08 | 中国人民解放军火箭军工程大学 | Closed circulation loop-based on-site calibration method for tritium monitor in air |
| CN114879245B (en) * | 2022-04-11 | 2022-12-02 | 中国人民解放军火箭军工程大学 | On-spot calibrating device of tritium monitor in air based on closed circulation loop |
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Application publication date: 20150422 |