CN111649230A - Vacuum inflation system and inflation method for Kr-85 sealed radioactive source - Google Patents
Vacuum inflation system and inflation method for Kr-85 sealed radioactive source Download PDFInfo
- Publication number
- CN111649230A CN111649230A CN202010474191.0A CN202010474191A CN111649230A CN 111649230 A CN111649230 A CN 111649230A CN 202010474191 A CN202010474191 A CN 202010474191A CN 111649230 A CN111649230 A CN 111649230A
- Authority
- CN
- China
- Prior art keywords
- source
- inflation
- gas
- vacuum
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G4/00—Radioactive sources
- G21G4/04—Radioactive sources other than neutron sources
- G21G4/06—Radioactive sources other than neutron sources characterised by constructional features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0135—Pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention relates to a vacuum inflation system and an inflation method for a Kr-85 sealed radioactive source. The inflation method comprises the following steps: installing a source box; vacuumizing the system; leak detection of the source box; releasing the raw material gas; inflation or supercharged inflation; cutting off the source shell connection and sealing the source shell; adding liquid nitrogen, and recovering pipeline gas from the raw material tank; liquid nitrogen is added, and the tail gas tank recovers residual gas. The system improves the operation safety, improves the performance of Kr-85 sealed source, simplifies the production flow, improves the inflation pressure, emergently treats the accident situation in the production process of the radioactive source, sets safety protection measures, prevents misoperation and simultaneously realizes the high-efficiency recovery of residual radioactive gas.
Description
Technical Field
The invention belongs to the field of vacuum inflation of radioactive sources, and particularly relates to a vacuum inflation system of a Kr-85 sealed radioactive source and an inflation method.
Background
Kr-85 sealed radiation source is a radiation source made by sealing Kr-85 gas in a source shell. The Kr-85 sealed radioactive source is generally used for a beta-ray thickness gauge to measure the thickness of paper and films.
The preparation method of the Kr-85 sealed radioactive source comprises two methods: one method is to fix Kr in a solid carrier by adsorption to prepare a solid source. The adsorbent is selected from activated carbon, silica gel, zeolite, and caged organic compounds such as benzenediol. However, since the Kr-85 solid source is not very stable but is reliable in a low-temperature environment, Kr is decomposed from the solid adsorbate when the Kr-85 solid source is in service in a high-temperature environment. Another preparation method is generally used, Kr-85 is sealed in a metal shell.
The early domestic gas-filled system for sealed radioactive source includes vacuum pump, source shell, raw material tank, reserved pipeline, main pipeline, valve, vacuum meter and vacuum meter. Firstly, a vacuum pump is adopted to vacuumize an inflation system, and then radioactive Kr-85 gas with certain pressure is inflated. After the gas is filled, radioactive gas in the pipeline needs to be recovered, the raw material tank is placed into a liquid nitrogen cold trap, and the gas is recovered into the raw material tank by utilizing the principle of thermal expansion and cold contraction.
Because the system valve is a manual valve, the dosage of hands is easily higher; the system has large pipeline volume, low air exhaust efficiency of the vacuum pump, prolonged production operation time and prolonged exposure dose of personnel. Due to the large volume of the pipeline85The recovery efficiency of the Kr gas cold trap is certain, the pipeline can retain part of radioactive gas (the dosage of the outer surface of the pipeline can reach 5 MuSv/h), and the retained gas is pumped out of the system during subsequent vacuum pumping, so that the excessive emission is easily caused. The source shell interface is a vacuum rubber tube, so that the source shell interface is easy to age in a radiation field to cause leakage of a joint, and the source shell is vacuumized and filledGas leakage is likely to occur during the process. Early Kr-85 sealed radioactive sources are all negative pressure sources, and the system has the defects of poor inflation pressure accuracy, poor safety and the like. When all the gas in the raw material tank is released into the pipeline, the pressure is the highest inflation pressure of the system, and the gas pressure in the raw material tank does not exceed 1 atmosphere generally, so that the highest inflation pressure of the system is only 100 kPa.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a semi-automatic inflation system which can realize remote control of a valve, simplify the production flow, improve the inflation pressure, emergently treat the accident situation in the production process of a radioactive source, set safety protection measures, prevent misoperation and simultaneously realize efficient recovery of residual radioactive gas. The system improves the operation safety and improves the performance of the Kr-85 sealing source.
In order to achieve the above purpose, the invention provides the following technical scheme:
a Kr-85 sealed radioactive source vacuum inflation system comprises a booster pump, an aluminum protection module, a radioactive source tank, a low-temperature recovery tank, a reserved expansion port, an instrument, an automatic valve component, a main gas pipeline, a pneumatic control component, a pneumatic pump, a vacuum pump and a control box which are matched;
the vacuum pump is connected to a vacuum port of the system through a vacuum bellows; the control box is respectively connected to a control unit of the booster pump, a control unit of the automatic valve assembly and a control unit of the pneumatic control component through cables, and sends control instructions through control software;
the joints of the booster pump, the aluminum protection module, the radioactive source tank, the low-temperature recovery tank and the instrument are VCR joints, and the serial-parallel connection of the system components is realized through a gas main pipeline;
the instrument is connected to the control box through a cable, and then the instrument sends and displays measurement data through control software;
the pneumatic control component, the pneumatic pump and the automatic valve assembly are all connected to the system through air pipes; the pneumatic pump provides the gas pressure required by the system, and the control box sends an instruction to the pneumatic control component through control software; the pneumatic control member provides pneumatic power to the automatic valve assembly and the booster pump.
As a preferred scheme of the present invention, the system further comprises a reserved expansion port, and the reserved expansion port is used for system verification, cold experiment debugging and cold source preparation process groping.
As a preferable scheme of the present invention, the reserved expansion port includes an expansion port one and an expansion port two.
As a preferred scheme of the invention, the booster pump comprises an all-metal shell, a booster pump piston and a spring, wherein the spring is arranged in the all-metal shell, and the booster pump piston is connected to the top end of the spring;
the booster pump utilizes pneumatic valves K10 and K11 to cooperate and link to realize the function of boosting during air inflation and the function of recovering residual radioactive gas after air inflation and reverse pressurization.
As a preferable scheme of the invention, the aluminum protection module comprises a plastic gasket, a metal gasket, a source box shell, a copper tube and a threaded pressing sheet;
the metal gasket is arranged on the plastic gasket, and the plastic gasket is sleeved on the source box shell;
the threaded pressing plate can move up and down, and the threaded pressing plate is fastened downwards and can press the metal gasket and the plastic gasket to force the plastic gasket to deform.
As a preferable aspect of the present invention, the aluminum protection module includes 6 capsules.
In a preferred embodiment of the present invention, the recovery tank is a hollow tank body made of austenitic stainless steel, and the interior of the recovery tank is filled with high-surface activated carbon.
In a preferred embodiment of the present invention, the raw material tank is a hollow tank made of austenitic stainless steel, and the interior of the tank is filled with high-surface activated carbon.
It is a second object of the present invention to provide a method of aerating with a Kr-85 sealed radioactive source vacuum aeration system as described above, said method comprising the steps of:
installing a source box;
vacuumizing the system;
leak detection of the source box;
releasing the raw material gas;
inflation or supercharged inflation;
cutting off the source shell connection and sealing the source shell;
adding liquid nitrogen, and recovering pipeline gas from the raw material tank;
liquid nitrogen is added, and the tail gas tank recovers residual gas.
The invention has the beneficial effects that:
the invention provides a semi-automatic inflation system which can realize remote control of a valve, simplify the production flow, improve inflation pressure, emergently treat accident conditions in the production process of a radioactive source, set safety protection measures, prevent misoperation and simultaneously realize efficient recovery of residual radioactive gas. The system improves the operation safety and improves the performance of the Kr-85 sealing source.
The inflation system adopts an air compressor and a pneumatic diaphragm valve to be used together, and utilizes an industrial control software platform to realize automatic and manual control of the system. The leakage rate of the whole system is not higher than 10-9Pa·m3/s。
Drawings
FIG. 1 is a schematic diagram of a vacuum inflation system for Kr-85 sealed radioactive source.
FIG. 2 is a schematic view of a booster pump.
FIG. 3 is a schematic view of an aluminum protection module;
in the figure, 1-plastic gasket, 2-metal gasket, 3-source box shell, 4-copper tube, 5-threaded pressing sheet, 6-vacuum interface and 7-module cavity.
FIG. 4 is a flow chart of the inflation process using a Kr-85 sealed radioactive source vacuum inflation system.
Detailed Description
The following detailed description of specific embodiments of the present invention is provided in connection with the accompanying drawings and the embodiments.
The invention discloses a novel all-metal Kr-85 sealed source inflation system and systemThe device mainly comprises a booster pump, an aluminum protection module, a radioactive source tank, a low-temperature recovery tank, a reserved expansion port, an instrument, a valve component, a pneumatic control component, a matched pneumatic pump, a vacuum pump, a control box and the like. The inflation system adopts an air compressor and a pneumatic diaphragm valve to be used together, and utilizes an industrial control software platform to realize automatic and manual control of the system. The leakage rate of the whole system is not higher than 10-9Pa·m3And s. The schematic diagram of the system is shown in fig. 1, wherein the valves from bottom left to bottom right are K1-K6, and the valves from top right to top left are K7-K15.
The radioactive source tank provides a system air source, the booster pump is used for boosting the air source to positive pressure, residual gas in the low-temperature recovery tank recovery system is used for protecting the air source leakage in the operation process. The vacuum system is used for providing vacuum conditions required by the system, and the pneumatic control component, the matched pneumatic pump and the control box are used for realizing automatic control of the system.
The instrument comprises a vacuum gauge and a vacuum meter.
The main gas pipeline is formed by welding a stainless steel pipe, a welded three-way pipe joint, a welded four-way pipe joint and a VCR joint.
The joints of the booster pump, the aluminum protection module, the radioactive source tank, the low-temperature recovery tank and the instruments are VCR joints, and the serial-parallel connection of the system components is realized through a main pipeline.
The vacuum port reserved with the expansion port and connected with the vacuum pump end is a KF10 flange joint. The joint used by the vacuum pump is a KF16 flange interface and is connected to the vacuum port of the system through a vacuum bellows.
The control unit of the booster pump, the control unit of the valve assembly and the control unit of the pneumatic control member are connected to the control box through cables, and then control instructions are sent through control software installed on the control box.
The instrument sensing unit is connected to the control box through a cable, and then sends and displays measurement data through control software installed in the control box.
The pneumatic control component, the joint used by the pneumatic pump and the pneumatic unit of the automatic valve assembly are quick air pipe joints which are connected through air pipes. The pneumatic pump provides the gas pressure required by the system and the control box then sends commands to the pneumatic control means through the control software. The pneumatic control member provides pneumatic power to the automatic valve assembly and the booster pump.
The functions of each part of the system are as follows:
(1) booster pump
The accurate control of the pressure of the inflation source shell is realized by adopting the self-developed all-metal sealing gas booster pump. The booster pump is schematically shown in fig. 2, a piston of the booster pump realizes compression and expansion motions through a driving force F1 and a spring force F2, and a pneumatic valve K10 and a pneumatic valve K11 are cooperatively linked to realize a boosting function during inflation and a reverse boosting residual radioactive gas recovery function after inflation:
1) a supercharging function:
a. closing a valve K10, opening a valve K11, expanding a booster pump, and sucking air from a K11 end (a raw material tank end) by the booster pump;
b. valve K11 is closed, valve K10 is opened, the booster pump compresses, and the inspired gas is compressed to K10 (Kr-85 sealed radiation source).
2) The recovery function is as follows:
a. closing a valve K11, opening a valve K10, expanding a booster pump, and sucking air from a K10 end (a system pipeline) by the booster pump;
b. valve K10 is closed, valve K11 is opened, the booster pump compresses, and the sucked gas is compressed to the K11 end (raw material can end).
(2) Aluminum protection module
The aluminum protection module is mainly composed of a plastic gasket 1, a metal gasket 2, a source box shell 3, a copper tube 4, a threaded pressing sheet 5, a vacuum interface 6 and a module cavity 7, as shown in fig. 3. The protection module has the functions of quickly recovering radioactive gas under the condition of realizing accidents and preventing the radioactive gas from diffusing into the environment to cause loss to people and pollution to the environment. The sealing function is realized as follows:
the threaded pressing sheet compresses the plastic gasket to deform through the metal gasket, so that the sealing function of the lower half shell of the source box is realized; the vacuum interface realizes negative pressure vacuum of the aluminum protection module cavity and ensures that gas is not released to the environment. In order to facilitate the disassembly of the source box, the aluminum protection module has a pneumatic structural design and can move up and down. The system can inflate 6 source cartridges simultaneously or each source cartridge individually, and the inflation pressure is recorded by using a vacuum gauge P1.
The number of capsules is not limited by the present invention and can be selected as desired.
Under accident conditions, when the shell of the inflation source box is suddenly broken in the inflation process, the valve K7 is kept closed, the valves K1-K12 are kept opened, the other valves are closed, the raw material tank and the recovery tank are immersed in liquid nitrogen, and the valves K12 and K13 are opened, so that the situation that the pipeline is internally provided with the valves K1-K12 is achieved85Recovery of Kr gas without generation85Leakage of Kr gas.
A clamping groove is arranged in the deep hole for installing the source box, so that the plastic gasket is placed in the hole and is fixed at the depth of about 2/3. At the same time, the cartridge housing is precisely placed within the deep hole so that the plastic gasket fits around the cartridge housing at about 1/2 height and makes slight contact with the cartridge housing. A metal gasket is placed over the plastic washer. The part of the installation deep hole above about 1/2 is threaded, the threaded pressing plate is fastened downwards, and the metal gasket and the plastic gasket are pressed tightly, so that the plastic gasket is forced to deform. The plastic gasket, the module cavity, and the capsule housing are in intimate contact, thus achieving a vacuum seal at about 1/2 height of the capsule housing.
The module cavity is provided with six source box installation deep holes, the deep holes are communicated with one another and communicated to a vacuum interface, and the vacuum interface of the aluminum protection module is a VCR interface and is finally connected to a vacuum pump through a main pipeline. The vacuum interface is connected with a pneumatic valve K7 through a main pipeline, and a copper tube of the source box shell is connected with the pneumatic valve K1-K6 through a double-clamping sleeve.
The communicating air gap between the source box and the aluminum protection module is connected through a valve85Kr air pumping loop can realize simultaneous vacuum pumping, and the air gap leakage rate is not higher than 10-6Pa · m 3/s. In the source box filling85In the Kr gas process, the source box-aluminum block air gap is evacuated (to achieve a negative pressure environment). After shearing, the corresponding valves are opened one by one to observe the reading change of the pressure gauge, so that the cold welding is reliable and no air leakage occurs.
(3) Recovery tank and head tank
The recovery tank and the raw material tank are hollow tank bodies made of austenitic stainless steel, and activated carbon with high surface is filled in the recovery tank and the raw material tank. The recovery tank and the raw material tank are soaked in liquid nitrogen, valves K12 and K13 are opened, and the recovery of the residual radioactive gas of the pipeline can be realized by utilizing the principles of expansion and contraction of gas and high-efficiency adsorption of gas by activated carbon.
(4) Reserved expansion port
The gas expansion ports 1 and 2 can be used for replenishment85Kr raw gas, when the radioactive Kr-85 gas in the raw material tank is insufficient and needs to be supplemented, the expansion port 1 or the expansion port 2 is connected85Kr raw material gas, vacuumizing the system, opening a K14 or K15 valve, putting the raw material gas into the system, soaking a raw material tank in liquid nitrogen, and opening a valve K13 to realize supplement85Kr raw gas. The invention does not limit the number of the reserved expansion ports, and the number of the reserved expansion ports can be selected according to requirements.
(5) Control box
The control box controls the up-and-down piston movement of the booster pump and the opening and closing of the K1-K15 pneumatic valve, and the control box is remotely operated and controlled, so that the irradiated radiation dose of personnel can be reduced.
(6) Pneumatic pump, vacuum pump
The pneumatic pump realizes the opening and closing drive of the valve, and the vacuum pump realizes the negative pressure vacuum inflation of the system.
The operation control aeration flow chart of the vacuum system is shown in fig. 4, and comprises the following steps:
installing a source box;
vacuumizing the system;
leak detection of the source box;
releasing the raw material gas;
inflation or supercharged inflation;
cutting off the source shell connection and sealing the source shell;
adding liquid nitrogen, and recovering pipeline gas from the raw material tank;
liquid nitrogen is added, and the tail gas tank recovers residual gas.
The vacuum inflation system is described below with reference to specific embodiments.
Example 1
This example is a reverse-packed Kr-85 feedstock. Kr-85 raw material gas is in a hemisphere tank with a manual valve, the inner cavity of the sphere is 300mL, and the pressure of the Kr-85 raw material gas is 110 kPa.
The connection of the hemisphere tank and the valve K14 is realized through the metal pipe and the clamping sleeve. In the vacuum inflation system, the raw material is not in the raw material tank, and the internal absolute pressure is 10 Pa.
The method comprises the following steps:
and opening a vacuum pump, opening K8, K9, K10, K11 and K14, evacuating the gas in the main pipeline until the indication number of the vacuum meter is 1Pa, and closing K8 and K9.
The recovery tank and the radiation source tank were immersed in liquid nitrogen and kept for 1 minute.
And opening a manual valve on the hemispherical tank to release Kr-85 raw material gas, so that the pipeline is filled with the raw material gas.
The K12 was opened to allow most of the Kr-85 gas in the line to flow back into the radiation source tank, and the K12 was closed until the pressure indicated less than-98 kPa.
K13 was opened to reflux the remaining raw material gas in the line to the recovery tank, K9 was opened, and K13 was closed when the vacuum gauge number was less than 5 Pa.
At this time, the absolute pressure of the gas in the pipeline is less than 5Pa, and the radioactive raw material gas is little remained.
Example 2
This example is the inflation of a 150kPa capsule.
And (3) putting the source box into an aluminum protection module, screwing the thread pressure head by using a special spanner, lifting the protection module, and screwing the double clamping sleeves to be connected with the K1-K6 valve in a threaded manner.
And (3) opening a vacuum pump, opening K8, K9, K10 and K11, evacuating the gas in the main pipeline until the indicated value of the vacuum meter is 1Pa, and closing K10 and K11.
Pneumatic valve K7 was opened and the aluminum protective module was evacuated.
K1-K6 were turned on in sequence, and a vacuum was drawn on each cartridge until the vacuum was 1 Pa. And closing K1-K6 and K8, opening K1 after 1 minute, judging that the source box connected with K1 leaks if the reading of the vacuum gauge is increased to be more than 20Pa after the valve is opened, sequentially opening K2-K6, and carrying out leak detection on the remaining 5 source boxes. The K9 valve was then closed.
Opening a valve K12, discharging the raw material gas, and opening valves K11, K10, K8 and K1-K6 in sequence to fill the raw material gas in the source box.
If the inflation pressure does not meet the requirement, a booster pump is needed for pressurization. At this time, the valve K10 is closed, the valve K11 is opened, and the booster pump sucks air from the end K11. Then, the valve K11 is closed, the valve K10 is opened, and the booster pump compresses the sucked gas to the K10 end.
After the inflation pressure is reached, the K1-K6 buttons are closed. And meanwhile, the change of the pressure gauge is concerned, and whether the source box leaks or not can be checked.
And (4) cutting the red copper tube of the source box by adopting hydraulic pliers. Then press the green button down.
The recovery tank and the radioactive source tank were immersed in liquid nitrogen. And opening K10-K12, exhausting the booster pump, recovering most of Kr-85 gas in the pipeline into the radioactive source tank, and closing K12 when the pressure indication is less than-98 kPa.
K13 is opened, K1-K6 is opened, and the tail gas in the pipeline flows back to the recovery tank.
The steps are adopted for inflation operation, wherein the specific activity of Kr-85 raw material gas is 60mCi/mL (under the condition of normal pressure), the inflation pressure is 140kPa, the volume of the inner cavity of the source box is 3.4mL, the activity after inflation reaches 290mCi, and all indexes of the radioactive source are qualified through inspection.
The above description is specific to the present invention and is not intended to limit the present invention to the specific embodiments. It will be apparent to those skilled in the art that a number of simple derivations and modifications can be made without departing from the inventive concept, and these are intended to be within the scope of the present invention.
Claims (9)
1. A Kr-85 sealed radioactive source vacuum inflation system comprises a booster pump, an aluminum protection module, a radioactive source tank, a low-temperature recovery tank, a reserved expansion port, an instrument, an automatic valve component, a gas main pipeline, a pneumatic control component, a pneumatic pump, a vacuum pump and a control box which are matched,
the vacuum pump is connected to a vacuum port of the system through a vacuum bellows; the control box is respectively connected to a control unit of the booster pump, a control unit of the automatic valve assembly and a control unit of the pneumatic control component through cables, and sends control instructions through control software;
the joints of the booster pump, the aluminum protection module, the radioactive source tank, the low-temperature recovery tank and the instrument are VCR joints which are connected with the gas main pipeline through the VCR joints;
the instrument is connected to the control box through a cable, and then the instrument sends and displays measurement data through control software;
the pneumatic control component, the pneumatic pump and the automatic valve assembly are all connected to the system through air pipes; the pneumatic pump provides the gas pressure required by the system, and the control box sends an instruction to the pneumatic control component through control software; the pneumatic control member provides pneumatic power to the automatic valve assembly and the booster pump.
2. The Kr-85 sealed radiation source vacuum inflation system according to claim 1, further comprising a reserved expansion port, wherein the reserved expansion port is used for system verification, cold experiment debugging and cold source preparation process groping.
3. The Kr-85 sealed radiation source vacuum inflation system of claim 2, wherein the reserved expansion port comprises a first expansion port and a second expansion port.
4. The Kr-85 sealed radioactive source vacuum inflation system of any one of claims 1 to 3, wherein the booster pump comprises an all-metal housing, a booster pump piston and a spring, the spring being disposed within the all-metal housing, the booster pump piston being connected at a top end of the spring;
the booster pump utilizes pneumatic valves K10 and K11 to cooperate and link to realize the function of boosting during air inflation and the function of recovering residual radioactive gas after air inflation and reverse pressurization.
5. The Kr-85 sealed radioactive source vacuum inflation system of any one of claims 1 to 3, wherein the aluminum protection module comprises a plastic gasket, a metal gasket, a source cartridge housing, a copper tube and a threaded preform;
the metal gasket is arranged on the plastic gasket, and the plastic gasket is sleeved on the source box shell;
the threaded pressing plate can move up and down, and the threaded pressing plate is fastened downwards and can press the metal gasket and the plastic gasket to force the plastic gasket to deform.
6. The Kr-85 sealed radioactive source vacuum inflation system of any one of claims 1 to 3, wherein the aluminum protection module comprises 6 source cartridges.
7. The Kr-85 sealed radioactive source vacuum inflation system of any one of claims 1 to 3, wherein the recovery tank is a hollow tank body made of austenitic stainless steel and filled with high surface activated carbon.
8. The Kr-85 sealed radioactive source vacuum inflation system of any one of claims 1 to 3, wherein the raw material tank is a hollow tank body made of austenitic stainless steel and filled with high-surface activated carbon.
9. A method of inflating a vacuum inflation system for a Kr-85 sealed radioactive source as claimed in any one of claims 1 to 8, said method comprising the steps of:
installing a source box;
vacuumizing the system;
leak detection of the source box;
releasing the raw material gas;
inflation or supercharged inflation;
cutting off the source shell connection and sealing the source shell;
adding liquid nitrogen, and recovering pipeline gas from the raw material tank;
liquid nitrogen is added, and the tail gas tank recovers residual gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474191.0A CN111649230B (en) | 2020-05-29 | 2020-05-29 | Vacuum inflation system for Kr-85 sealed radioactive source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474191.0A CN111649230B (en) | 2020-05-29 | 2020-05-29 | Vacuum inflation system for Kr-85 sealed radioactive source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111649230A true CN111649230A (en) | 2020-09-11 |
| CN111649230B CN111649230B (en) | 2022-07-01 |
Family
ID=72341550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010474191.0A Active CN111649230B (en) | 2020-05-29 | 2020-05-29 | Vacuum inflation system for Kr-85 sealed radioactive source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111649230B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241206A (en) * | 2021-05-13 | 2021-08-10 | 原子高科股份有限公司 | Radioactive source recovery device and radioactive source recovery system |
| CN116119630A (en) * | 2023-02-22 | 2023-05-16 | 北京中科富海低温科技有限公司 | Normal-pressure helium recovery system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914372A (en) * | 1971-11-27 | 1975-10-21 | Sinloihi Co Ltd | Process for the preparation of labelled compounds |
| DD119472A1 (en) * | 1975-02-27 | 1976-04-20 | ||
| CN2883312Y (en) * | 2006-04-17 | 2007-03-28 | 上海轻工业研究所有限公司 | Self-sucking liquid bottle filler |
| CN203941039U (en) * | 2014-07-04 | 2014-11-12 | 环境保护部核与辐射安全中心 | Radioactivity inert gas sampler in nuclear power plant's chimney |
| CN108899104A (en) * | 2018-07-26 | 2018-11-27 | 中国核动力研究设计院 | One kind is used to prepare85The device and method of Kr standard source |
-
2020
- 2020-05-29 CN CN202010474191.0A patent/CN111649230B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3914372A (en) * | 1971-11-27 | 1975-10-21 | Sinloihi Co Ltd | Process for the preparation of labelled compounds |
| DD119472A1 (en) * | 1975-02-27 | 1976-04-20 | ||
| CN2883312Y (en) * | 2006-04-17 | 2007-03-28 | 上海轻工业研究所有限公司 | Self-sucking liquid bottle filler |
| CN203941039U (en) * | 2014-07-04 | 2014-11-12 | 环境保护部核与辐射安全中心 | Radioactivity inert gas sampler in nuclear power plant's chimney |
| CN108899104A (en) * | 2018-07-26 | 2018-11-27 | 中国核动力研究设计院 | One kind is used to prepare85The device and method of Kr standard source |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241206A (en) * | 2021-05-13 | 2021-08-10 | 原子高科股份有限公司 | Radioactive source recovery device and radioactive source recovery system |
| CN116119630A (en) * | 2023-02-22 | 2023-05-16 | 北京中科富海低温科技有限公司 | Normal-pressure helium recovery system and method |
| CN116119630B (en) * | 2023-02-22 | 2023-11-10 | 北京中科富海低温科技有限公司 | Normal-pressure helium recovery system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111649230B (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111649230B (en) | Vacuum inflation system for Kr-85 sealed radioactive source | |
| CN101581643A (en) | Water jacket and air bag type sealing device for hydraulic test of air bottle outside measuring method | |
| CN203519430U (en) | Sealing device for water pressure test of gas cylinder in water jacket method | |
| CN102060151B (en) | Risk source leakage self-adaption universal ferromagnetic plugging device and fast plugging method thereof | |
| CN211291907U (en) | Airtight testing platform of protective airtight door | |
| CN219474893U (en) | Water pump tightness detection device | |
| CN110439792B (en) | Gas high-sealing medium-speed pressure regulating system and method | |
| CN209416626U (en) | A kind of new energy car battery box shell gases side leakage detection device | |
| CN202402676U (en) | Flange pressurized-sealed type glasses valve | |
| CN217442797U (en) | Seal gasket performance detection device | |
| CN207050924U (en) | A kind of end cap structure for pressure test | |
| CN206891669U (en) | A kind of automotive air intake pipe air tightness detection equipment | |
| CN201990122U (en) | Magnetism plugging device with strong self-adaption | |
| CN213121030U (en) | Boiler pressure vessel leakage detection device | |
| CN212986422U (en) | Pipeline is salvageed and is used hydraulic pressure plugging device for gas management | |
| CN215449010U (en) | Vacuum experiment environment simulation device | |
| CN112407643B (en) | Low-temperature adsorption device for tank interlayer and working method | |
| CN214471617U (en) | Leak detection equipment for sealing module | |
| CN112945959A (en) | Vacuum experiment environment simulation device | |
| CN202561301U (en) | Pressurized seal connection piece | |
| CN207832790U (en) | Destructive characteristics experimental provision of the coal cinder containing high pressure gas in the unexpected release of ambient atmos | |
| CN215414223U (en) | Air-tight detection equipment for new energy battery pack | |
| CN207991760U (en) | A kind of air tightness test plug | |
| CN216447255U (en) | Emergency release device for low-temperature fluid loading and unloading arm | |
| CN216524584U (en) | Waterproof sealing performance testing tool for high-voltage controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |