CN110850465A - Portable β ray irradiator for field calibration of photoluminescence fluorescence dosimeter - Google Patents
Portable β ray irradiator for field calibration of photoluminescence fluorescence dosimeter Download PDFInfo
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- CN110850465A CN110850465A CN201911051727.1A CN201911051727A CN110850465A CN 110850465 A CN110850465 A CN 110850465A CN 201911051727 A CN201911051727 A CN 201911051727A CN 110850465 A CN110850465 A CN 110850465A
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- portable
- radioactive source
- ray irradiator
- transmission window
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/02—Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K5/00—Irradiation devices
Abstract
The invention belongs to the technical field of ionizing radiation dose monitoring, and particularly relates to a portable β ray irradiator for field calibration of a photoluminescence fluorescence flowmeter, which is used for irradiating an OSLD (optical fluorescent flowmeter), wherein the OSLD is a photoluminescence fluorescence flowmeter and comprises a straight-plate support provided with a transmission window, an annular shield and a shield plate which are oppositely arranged on the surfaces of two sides of the support, the transmission window is positioned between the annular shield and the shield plate, and a radioactive source support arranged in the annular shield, a radioactive source is arranged in the radioactive source support, an irradiation chamber is arranged between the shield plate and the transmission window, a shutter is arranged between the transmission window and the irradiation chamber, and a sample disc for conveying the OSLD into the irradiation chamber.
Description
Technical Field
The invention belongs to the technical field of ionizing radiation dose monitoring, and particularly relates to a portable β ray irradiator for field calibration of a photoluminescence fluorescence dosimeter.
Background
The advantages of the photoluminescence fluorescence dosimeter (OSLD) such as stable signal, high sensitivity, wide measuring range and repeatable measurement become an excellent personal dosimeter, and the OSLD is widely applied to the fields of environmental, medical and space radiation monitoring at present. In order to ensure the accuracy of dose monitoring, the fluorogenic dosimeter needs to be calibrated before use, and the common calibration method is as follows: the dosimeter using unit sends the dosimeter to the detecting unit, the detecting unit irradiates by adopting a standard radiation field, then the using unit carries out measurement and reading, and calibration and correction are carried out through the difference between the measurement and reading value and the reference value.
However, for special environments such as radiation dose monitoring during long-term operation of a space station, personal dose monitoring during a nuclear power ocean mission, and dose monitoring under a nuclear emergency, the OSLD and the readout device for personal or environmental monitoring need to be followed for a long time, calibration in a time-scale laboratory is difficult, and reliability of the monitoring value is difficult to guarantee. Therefore, a field calibration device needs to be developed to solve the OSLD tracing problem and ensure the reliability of dose monitoring.
Disclosure of Invention
The invention aims to design a portable β irradiator for OSLD field calibration, which traces the dosage rate of a reference point of a portable β irradiator to a standard radiation field by transmitting a standard dosimeter, and then carries the portable β irradiator to the field to carry out field calibration on the OSLD, thereby solving the problem of the reliability of dosage monitoring under the special environment.
In order to achieve the above object, the technical scheme adopted by the invention is a portable β ray irradiator for field calibration of a photoluminescence fluorescence dosimeter, which is used for irradiating an OSLD, wherein the OSLD is the photoluminescence fluorometer and comprises a straight-plate type bracket provided with a transmission window, an annular shielding body and a shielding plate, the annular shielding body and the shielding plate are oppositely arranged on the two side surfaces of the bracket, the transmission window is positioned between the annular shielding body and the shielding plate, a radioactive source bracket is arranged in the annular shielding body, a radioactive source is arranged in the radioactive source bracket, an irradiation chamber is arranged between the shielding plate and the transmission window, a shutter is arranged between the transmission window and the irradiation chamber, and a sample disc for conveying the OSLD into the irradiation chamber is also included.
Furthermore, the radioactive source support is arranged on the position of the circle center in the annular shielding body in a replaceable mode.
Furthermore, the transmission window is made of beryllium materials, and the radioactive source support is made of brass, aluminum alloy, stainless steel or other copper materials capable of playing a role in shielding.
Furthermore, the annular shielding body is made of brass, aluminum alloy, stainless steel or other copper materials capable of playing a shielding role.
Further, the shutter is controlled to be opened and closed through an electromagnetic valve, the electromagnetic valve is arranged on the support, and the time control precision of the electromagnetic valve on the shutter is 0.01 s.
Further, the radioactive source is an electrodeposition plane source with controllable activity, and the radioactive source is an β radioactive source.
Furthermore, the shielding plate is made of lead.
Further, the transmission window is located at the center of the annular shield.
Furthermore, the shutter is made of brass, aluminum alloy, stainless steel or other copper materials capable of playing a role in shielding.
The invention has the beneficial effects that:
1. the portable β ray irradiator provided by the invention has the overall size not more than 150mm multiplied by 80mm multiplied by 50mm and the weight not more than 3kg, can be conveniently carried to the site to calibrate the OSLD, and solves the problem of site calibration under the special environment of the OSLD.
2. The movable radioactive source bracket is designed, and radioactive sources of different types and activities can be replaced at any time according to actual needs, so that the application range of the portable β ray irradiator is expanded.
3. The electro-deposition plane source with the controllable active region is designed, so that the ray direction in the irradiation chamber tends to be collimated, and the uniformity of the dose rate of the irradiation chamber is improved.
4. The unique shielding body structure is designed, wherein lead shielding is adopted right below the radioactive source, brass shielding is adopted in other directions, the integral volume and weight of the portable β ray irradiator are reduced while the radiation protection requirement is met, and the portable requirement is met.
5. A brass shutter for blocking rays is designed, the electromagnetic valve is used for controlling the shutter to act, the irradiated dose is accurately calculated by recording the time interval of the on-off of the shutter, and the deviation caused by dose rate change is reduced.
Drawings
FIG. 1 is a schematic diagram of a portable β ray irradiator for field calibration of a fluorogenic dosimeter according to an embodiment of the invention;
FIG. 2 is a sectional view A _ A of a portable β ray irradiator for field calibration of a fluorogenic dosimeter according to an embodiment of the invention;
in the figure: the device comprises a 1-annular shield, a 2-shutter, a 3-bracket, a 4-sample disc, a 5-electromagnetic valve, a 6-radioactive source bracket, a 7-fastening device, an 8-transmission window, a 9-radioactive source clamping groove and a 10-shielding plate.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1 and fig. 2, the portable β ray irradiator for field calibration of a fluorogenic flowmeter, provided by the invention, is used for irradiating an OSLD (the OSLD is a fluorogenic flowmeter), and comprises an annular shielding body 1, a shutter 2, a bracket 3, a sample disc 4, an electromagnetic valve 5, a radioactive source bracket 6, a fastening device 7, a transmission window 8, a radioactive source clamping groove 9, a shielding plate 10 and other parts.
The bracket 3 is of a straight plate type, and the annular shield 1 and the shield plate 10 are oppositely arranged on the two side surfaces of the bracket 3. The annular shielding body 1 is made of brass, aluminum alloy, stainless steel or other copper materials capable of playing a shielding role; the material of the shielding plate 10 is lead.
The transmission window 8 is arranged on the support 3, the transmission window 8 is positioned between the annular shield body 1 and the shield plate 10, and the transmission window 8 is made of beryllium material (also called beryllium window). The transmission window 8 is located in the center of the annular shield 1.
The radioactive source support 6 is arranged at the center of a circle in the annular shielding body 1, the radioactive source support 6 is internally provided with a radioactive source, the radioactive source support 6 is arranged in the annular shielding body 1 in a replaceable mode, the material of the radioactive source support 6 is brass, aluminum alloy, stainless steel or other types of copper materials capable of playing a shielding role, the radioactive source is an activity-controllable electro-deposition plane source, and the radioactive source is an β ray radioactive source.
An irradiation chamber is provided between the shielding plate 10 and the transmission window 8, and the shutter 2 is provided between the transmission window 8 and the irradiation chamber. The shutter 2 is made of brass, aluminum alloy, stainless steel or other copper materials capable of playing a role of shielding.
A sample tray 4 is provided on one side of the irradiation chamber for transporting the OSLD into the irradiation chamber.
The shutter 2 is controlled to be opened and closed by an electromagnetic valve 5, the electromagnetic valve 5 is arranged on the bracket 3, and the time control precision of the electromagnetic valve 5 on the shutter 2 is 0.01 s.
The invention provides a portable β ray irradiator for field calibration of a photoluminescence fluorescence flowmeter, which is designed by the following special design:
1) radiation source part
The method comprises the steps of electroplating β radioactive sources with certain activity onto an aluminum alloy substrate by an electrodeposition method to form an electroplating source, measuring the surface emissivity of the electroplating source by a 2 pi multi-wire proportional counter, fixing the electroplating source on a radioactive source support 6 made of a copper material, and loading the radioactive source support 6 onto a portable β ray irradiator when in use.
2) Irradiated part
When in use, the OSLD is placed in the irradiation chamber for irradiation, and the β ray standard is responsible for calibrating the β ray dose rate of the reference point of the irradiation chamber by a field, wherein the transmission window 8 is positioned between the irradiation chamber and a radioactive source and has the function of preventing an irradiated sample (OSLD) from contacting the radioactive source, the annular shield 1 is arranged above the transmission window 8, and the shield plate 10 is arranged below the irradiation chamber and has the function of preventing radiation leakage.
3) Control section
The 'unirradiated/irradiated' state of the OSLD is changed by reciprocating a shutter 2 between the transmission window 8 and the irradiation chamber, that is, β rays can be completely blocked when the shutter 2 moves to be right below the transmission window 8, so that the OSLD is in the unirradiated state, and the OSLD is under the irradiation of β rays after the shutter 2 is moved away, the action of the shutter 2 is controlled by an electromagnetic valve 5, the radiation dose is changed by controlling the irradiation time of β rays of the OSLD, and the precision of the time control is 0.01 s.
Finally, the practical application of the portable β ray irradiator for field calibration of a fluorogenic dosimeter provided by the invention is illustrated.
Prepared by electrodeposition90Sr-90The Y radioactive source is loaded on a radioactive source bracket 6, the activity of the Y radioactive source is about 3MBq, the peripheral dosage rates of the portable β ray irradiators are measured through a 451P survey meter, the values of the peripheral dosage rates are less than 0.25 mu Sv/h and are at the environmental level, the reference point of the portable β ray irradiator is fixed through transmitting a standard dosimeter and a β ray reference radiation field, the dosage rate of an irradiation chamber of the portable β ray irradiator is (0.060-0.083) mGy/s, the standard uncertainty is 6.9 percent, the OSLD of the same batch is placed at the same position of the irradiation chamber of the portable β ray irradiator for irradiation, and the irradiation dosage isThe reproducibility was 3.9% (n ═ 10).
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (9)
1. A portable β ray irradiator for field calibration of a photoluminescence fluorescence flowmeter is used for irradiating an OSLD, and is characterized by comprising a straight-plate type support (3) provided with a transmission window (8), an annular shielding body (1) and a shielding plate (10) which are oppositely arranged on the surfaces of two sides of the support (3), wherein the transmission window (8) is positioned between the annular shielding body (1) and the shielding plate (10), a radioactive source support (6) is arranged in the annular shielding body (1), a radioactive source is arranged in the radioactive source support (6), an irradiation cavity is arranged between the shielding plate (10) and the transmission window (8), a shutter (2) is arranged between the transmission window (8) and the irradiation cavity, and a sample disc (4) for conveying the OSLD into the irradiation cavity is further included.
2. The portable β ray irradiator according to claim 1, wherein the radioactive source holder (6) is replaceably disposed at a center of a circle in the ring-shaped shield (1).
3. The portable β ray irradiator of claim 1, wherein the transmission window (8) is made of beryllium, and the radiation source support (6) is made of brass, aluminum alloy, stainless steel or other copper materials capable of shielding.
4. The portable β ray irradiator according to claim 1, wherein the annular shield (1) is made of brass, aluminum alloy, stainless steel or other copper material capable of shielding.
5. The portable β ray irradiator according to claim 1, wherein the shutter (2) is controlled to open and close by an electromagnetic valve (5), the electromagnetic valve (5) is disposed on the support (3), and the time control accuracy of the electromagnetic valve (5) to the shutter (2) is 0.01 s.
6. The portable β ray irradiator of claim 1 wherein the radioactive source is an activity-controllable electro-deposition planar source and the radioactive source is a β ray radioactive source.
7. The portable β ray irradiator according to claim 1, wherein the shielding plate (10) is made of lead.
8. The portable β ray irradiator according to claim 1, wherein the transmission window (8) is located at the center of the ring-shaped shield (1).
9. The portable β ray irradiator according to claim 1, wherein the shutter (2) is made of brass, aluminum alloy, stainless steel or other copper material capable of shielding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911051727.1A CN110850465B (en) | 2019-10-31 | 2019-10-31 | Portable beta-ray irradiator for field calibration of photoluminescence fluorescence dosimeter |
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| CN201911051727.1A CN110850465B (en) | 2019-10-31 | 2019-10-31 | Portable beta-ray irradiator for field calibration of photoluminescence fluorescence dosimeter |
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| CN110850465A true CN110850465A (en) | 2020-02-28 |
| CN110850465B CN110850465B (en) | 2021-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111557675A (en) * | 2020-05-12 | 2020-08-21 | 上海联影医疗科技有限公司 | Correction method, device and system of medical imaging device |
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