CN103135119A - Portable multi-range reference radiation device - Google Patents
Portable multi-range reference radiation device Download PDFInfo
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- CN103135119A CN103135119A CN2011103920488A CN201110392048A CN103135119A CN 103135119 A CN103135119 A CN 103135119A CN 2011103920488 A CN2011103920488 A CN 2011103920488A CN 201110392048 A CN201110392048 A CN 201110392048A CN 103135119 A CN103135119 A CN 103135119A
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Abstract
The invention belongs to ionizing radiation measurement techniques, and particularly relates to a portable multi-range reference radiation device. The structure comprises a radioactive source which is arranged in a lead screen. A lengthways radioactive source lifting channel is arranged in the lead screen. A control rod is arranged in the channel. The radioactive source is arranged at the lower end of the control rod. A collimator used for leading out radioactive rays is arranged on one side of the lead screen. A lead attenuation slice is arranged on the outboard of the collimator. The portable multi-range reference radiation device is convenient to remove and safe to use, and provides strong guarantee for field calibration and test of a gamma dosage instrument.
Description
Technical field
The invention belongs to ionising radiation metering technology, be specifically related to a kind of Portable multirange reference radiation device.
Background technology
In the mankind's ionising radiation practice, radiation dosimetry has been applied to the industry-by-industries such as industry, agricultural and health care.In nuclear radiation protection and application, use the personal dose to take into account radiation level and employee exposed to radiation and the suffered radiation dose of the public of monitor accurate quantitative analysis workplace, for how to take safeguard procedures and correct evaluation damage effect and dose relationship and predict human-body biological effect and hereditary effect, be all vital.Therefore set up an accurate Reference radiation field and be used for these dosage measurement instruments of scale, also be absolutely necessary.For electromagnetism ionizing radiation (X ray and gamma-rays), the γ Reference radiation field is generally to use radioactive isotope to set up and the X Reference radiation field is to use X-ray tube to set up.For the γ Reference radiation field, exposure at nC/ (kg.h) to 10
2Reference radiation field in μ C/ (kg.h) order magnitude range is used for the calibration of ambient level and protection level dosage measurement instrument, and exposure is used for the treatment of scale with level of processing dosage measurement instrument at 10mC/ (kg.h) to the Reference radiation field in 10C/ (kg..h) order magnitude range.From the ambient level to the protection level, the dose rate of radiation field has been crossed over five or six orders of magnitude.If set up this kind radiation field, a kind of method is that the radioactive source with several different activity, another kind of method are to change the dose rate at reference point place with attenuator, and then a kind of method need to be determined the quality (power spectrum) of radiation after overdamping.Perhaps also just because of this reason, the use of this method with respect to multi-source method evening many.Using damped method to set up Reference radiation field has advantages of following:
● radioactive source can be saved and the source container shielding thickness can be reduced.
● can simplify or save the stem device.
Certainly, though this kind method has avoided using a plurality of radioactive sources, also to solve following problem simultaneously:
● determine that subtracting by lead Reference radiation field power spectrum that sheet causes changes impact on instrument calibration;
● need to consider the electronic pollution of radiation field from the close together of radioactive source the time.
On the whole, damped method has above-mentioned plurality of advantages as a kind of technology of setting up isotope γ Reference radiation field, but also needs to solve simultaneously the more distinctive problems of this kind technology on technological layer.
Summary of the invention
The object of the invention is to for the needs of setting up radiation field in real work, a kind of convenient Portable multirange reference radiation device that moves and use safety is provided.
Technical scheme of the present invention is as follows: a kind of Portable multirange reference radiation device, comprise the radioactive source that is placed in lead shield, and be provided with the passage of radioactive source lifting longitudinally in lead shield, be provided with control rod in passage, described radioactive source is located at the lower end of control rod; One side in lead shield is provided be used to the collimating apparatus of drawing radioactive ray, and the outside of collimating apparatus is provided with plumbous attenuator.
Further, Portable multirange reference radiation device as above wherein, is provided with shell outside described lead shield, is provided with the lifting gear that is connected with control rod above shell.
Further, Portable multirange reference radiation device as above wherein, is provided with on described shell for the lock device that pins lifting gear.
Further, Portable multirange reference radiation device as above, wherein, described plumbous attenuator has three, be arranged in parallel successively outside collimator port, is provided with graphite linings between two adjacent plumbous attenuators.
Further, Portable multirange reference radiation device as above, wherein, the attenuation multiple of described three plumbous attenuators is followed successively by 4,10,10 times.
Further, Portable multirange reference radiation device as above, wherein, described lead shield is fastened by up and down two parts and forms, and the lead shield on top is provided with handle.
Further, Portable multirange reference radiation device as above, wherein, the thickness of described lead shield is 6～8cm.
Further, Portable multirange reference radiation device as above, wherein, described collimating apparatus is tapered cone collimator, the subtended angle of collimating apparatus is 24 °.
Further, Portable multirange reference radiation device as above, wherein, described radioactive source is
137Cs.
Beneficial effect of the present invention is as follows: Portable multirange reference radiation device provided by the present invention is loading 100mCi's
137During the Cs radioactive source, can provide at the scene the Reference radiation field of 10 μ Sv～10mSv magnitudes, and two dosage values of 0.2 times of full scale and 0.8 times are provided in each range ability.Therefore, this kind device can provide strong guarantee for field calibration and the check of γ dosage instrument (especially the instrument of scale is carried out in fixed installation and inconvenience dismounting to the laboratory).
Description of drawings
Fig. 1 is apparatus structure schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, Portable multirange reference radiation device provided by the present invention comprises the radioactive source 4 that is placed in lead shield 2, is provided with the passage of radioactive source lifting longitudinally in lead shield 2, is provided with control rod 3 in passage, and described radioactive source 4 is located at the lower end of control rod 3; One side in lead shield 2 is provided be used to the collimating apparatus 7 of drawing radioactive ray, and the outside of collimating apparatus 7 is provided with plumbous attenuator 8.The outer shell 1 that is provided with of lead shield 2, shell 1 top is provided with the lifting gear 5 that is connected with control rod 3.Described shell 1 is provided with for the lock device 10 that pins lifting gear 5.
Consider from the protection angle, up to now, in national standard in the content relevant to nuclear radiation requirement of shelter the strictest be GB16368-96 " producing and use the radiation protective requirement of the measuring instrument of sealed source ", wherein stipulate, must not be greater than 1mR/h (8.76 μ Gy/h) for the surface leakage radiation of the radiation source container that has operating personnel often to approach.And external existing product device surface dose rate is being installed 200mCi's
137In the situation of Cs radioactive source, less than 200mR/h, at one meter less than 10mR/h.In addition, for fixed reference radiation device, its surface dose rate of General Requirements is less than 25 μ Gy/h.On the basis of considering as a whole, when the 137Cs radioactive source of 100mCi was installed in device of the present invention, the surface dose rate of device was less than 10 μ Gy/h.The physical dimension of radioactive source is taken as φ 8 * 10mm, and source(-)holder adopts aluminium, and is connected by nut with control rod (stainless steel).
In the present embodiment, plumbous attenuator 8 has three, be arranged in parallel successively outside collimating apparatus 7 outlets, is provided with graphite linings 9 between two adjacent plumbous attenuators.Three plumbous attenuator attenuation multiples probably are respectively 4,10,10 times.Radioactive source is controlled by control rod, and radioactive source will be pressed down operation again when transferring plumbous attenuator.In addition, in obsolete situation, will be pinned the lifting gear of control rod by lock device, it can not be used informally.Lock device can be common lockset, also can be the concrete custom-designed lockset form of application structure of basis.The lock device major function is that lifting gear is fixed, and can not be raised arbitrarily.Lifting gear can be hand hoisting bar or other liftable structures.
In device, the diameter of control rod can be subject to the impact of radioactive source diameter, and according to the size of radioactive source, the size of control rod is taken as 1.2cm.For choosing of front shield thickness, can be between 6cm-8cm.At this moment, can satisfy the apparatus surface dose rate when shielding thickness is 7cm and 8cm less than the principle of 10 μ Gy/h, in the present embodiment, the thickness of final lead shield layer is defined as 7cm.When actual processing shielding and assembling lead shield, all can be according to the size of the lead that contains with certain thickness stainless steel cladding.For lead shield inside involucrum thickness, due to its plumbous size less that contains, therefore can obtain littlely, and lead shield outer containment because its plumbous size that contains is larger, causes distortion, its thickness to obtain when therefore plumbous for fear of cast fully large.In final, involucrum and outer envelope are sized to 1.5mm and 6mm.Guarantee due to lead shield thickness to add again interior outer envelope in the situation of 7cm, therefore final shielding design should be tending towards guarding.
In addition, in order to load and unload the needs of radioactive source, the lead shield body is divided into up and down two parts, and the lead shield on top is provided with handle 6, when the loading and unloading radioactive source, the lead shield on top can be removed, until radioactive source install or removal after.Lead shield with top is fastened in the lead shield of bottom again.
In order to obtain enough large useful beam cross-section, the collimating apparatus subtended angle should reach a certain angle.ISO-4037-1 reaches and has recommended to use annular collimation optical cable in the GB GB/T 12162.1-2000 compatible with it, but the result of calculation of being announced by nearest Hakanen shows, in fact this kind collimating apparatus is compared with conical collimating apparatus (the latter half subtended angle is slightly large), and the aspects such as radiation components size outside useful beam cross-section and useful beam cross-section all do not have significantly to improve.In addition, due in the radiation field after the decay of plumbous attenuator obviously the parts of the useful beam cross-section of impact and scattering composition be no longer collimating apparatus, so to have adopted simple tapered cone collimator, the cross section of tapered cone collimator in the present embodiment be circle, and subtended angle is 24 °.
When leading attenuator not, it satisfies the regulation in ISO-4037-1 (12162.1-2000 is compatible with it), and the spectral measurement result after adding the plumbous attenuator of different-thickness shows that the variation of radiation field average energy is in 25keV.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. Portable multirange reference radiation device, it is characterized in that: comprise the radioactive source (4) that is placed in lead shield (2), being provided with longitudinally in lead shield (2), radioactive source promotes passage, be provided with control rod (3) in passage, described radioactive source (4) is located at the lower end of control rod (3); One side in lead shield (2) is provided be used to the collimating apparatus of drawing radioactive ray (7), and the outside of collimating apparatus (7) is provided with plumbous attenuator (8).
2. Portable multirange reference radiation device as claimed in claim 1, is characterized in that: be provided with shell (1) outside described lead shield (2), be provided with the lifting gear (5) that is connected with control rod (3) above shell (1).
3. Portable multirange reference radiation device as claimed in claim 2, is characterized in that: be provided with on described shell (1) for the lock device (10) that pins lifting gear (5).
4. Portable multirange reference radiation device as claimed in claim 1, it is characterized in that: described plumbous attenuator (8) has three, be arranged in parallel successively outside collimating apparatus (7) outlet, be provided with graphite linings (9) between two adjacent plumbous attenuators.
5. Portable multirange reference radiation device as claimed in claim 4, it is characterized in that: the attenuation multiple of described three plumbous attenuators is followed successively by 4,10,10 times.
6. Portable multirange reference radiation device as claimed in claim 1 is characterized in that: described lead shield (2) is fastened by up and down two parts and forms, and the lead shield on top is provided with handle (6).
7. Portable multirange reference radiation device as claimed in claim 6, it is characterized in that: the thickness of described lead shield (2) is 6～8cm.
8. Portable multirange reference radiation device as claimed in claim 1 is characterized in that: described collimating apparatus (7) is tapered cone collimator, and the subtended angle of collimating apparatus is 24 °.
9. Portable multirange reference radiation device as claimed in claim 1, it is characterized in that: described radioactive source (4) is
137Cs.
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| CN2011103920488A CN103135119A (en) | 2011-12-01 | 2011-12-01 | Portable multi-range reference radiation device |
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| CN2011103920488A CN103135119A (en) | 2011-12-01 | 2011-12-01 | Portable multi-range reference radiation device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330815A (en) * | 2014-11-26 | 2015-02-04 | 中国工程物理研究院核物理与化学研究所 | Method applied to detection of air kerma conventional true value |
| CN104345335A (en) * | 2014-10-30 | 2015-02-11 | 中国原子能科学研究院 | Portable radioactive ray irradiation device |
| CN104637563A (en) * | 2013-11-11 | 2015-05-20 | 中国辐射防护研究院 | Safety operation method of attenuation type automatic multi-range gamma irradiation device |
| CN104637564A (en) * | 2013-11-11 | 2015-05-20 | 中国辐射防护研究院 | Attenuation type automatic multi-range gamma irradiation device |
| CN104730567A (en) * | 2015-03-13 | 2015-06-24 | 中国计量科学研究院 | Attenuator |
| CN104808238A (en) * | 2014-01-27 | 2015-07-29 | 核工业航测遥感中心 | Solid radium source field calibrating device and method |
| CN105467426A (en) * | 2014-09-05 | 2016-04-06 | 中国辐射防护研究院 | Radioactive source remote-control pickup device in gamma activity measurement standard device |
| CN106770384A (en) * | 2016-11-21 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of gamma ray moves ray detection platform |
| CN109471155A (en) * | 2018-12-26 | 2019-03-15 | 中国原子能科学研究院 | It is a kind of for active electric from the pulsed X-ray irradiation unit that dosimeter is tested |
| CN109839653A (en) * | 2017-11-29 | 2019-06-04 | 中国辐射防护研究院 | A kind of a crystal of human eye health-monitoring installation and measurement method |
| CN112764088A (en) * | 2020-12-22 | 2021-05-07 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Neutron detector with calibration function |
| CN113219520A (en) * | 2021-05-10 | 2021-08-06 | 中国辐射防护研究院 | Radiation device and method capable of generating single pulse X-ray |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637564A (en) * | 2013-11-11 | 2015-05-20 | 中国辐射防护研究院 | Attenuation type automatic multi-range gamma irradiation device |
| CN104637563A (en) * | 2013-11-11 | 2015-05-20 | 中国辐射防护研究院 | Safety operation method of attenuation type automatic multi-range gamma irradiation device |
| CN104808238A (en) * | 2014-01-27 | 2015-07-29 | 核工业航测遥感中心 | Solid radium source field calibrating device and method |
| CN105467426A (en) * | 2014-09-05 | 2016-04-06 | 中国辐射防护研究院 | Radioactive source remote-control pickup device in gamma activity measurement standard device |
| CN104345335A (en) * | 2014-10-30 | 2015-02-11 | 中国原子能科学研究院 | Portable radioactive ray irradiation device |
| CN104330815A (en) * | 2014-11-26 | 2015-02-04 | 中国工程物理研究院核物理与化学研究所 | Method applied to detection of air kerma conventional true value |
| CN104330815B (en) * | 2014-11-26 | 2016-09-07 | 中国工程物理研究院核物理与化学研究所 | Air kerma conventional true value assay method |
| CN104730567A (en) * | 2015-03-13 | 2015-06-24 | 中国计量科学研究院 | Attenuator |
| CN106770384A (en) * | 2016-11-21 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of gamma ray moves ray detection platform |
| CN106770384B (en) * | 2016-11-21 | 2023-08-22 | 云南电网有限责任公司电力科学研究院 | Gamma ray removes ray testing platform |
| CN109839653A (en) * | 2017-11-29 | 2019-06-04 | 中国辐射防护研究院 | A kind of a crystal of human eye health-monitoring installation and measurement method |
| CN109471155A (en) * | 2018-12-26 | 2019-03-15 | 中国原子能科学研究院 | It is a kind of for active electric from the pulsed X-ray irradiation unit that dosimeter is tested |
| CN112764088A (en) * | 2020-12-22 | 2021-05-07 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Neutron detector with calibration function |
| CN113219520A (en) * | 2021-05-10 | 2021-08-06 | 中国辐射防护研究院 | Radiation device and method capable of generating single pulse X-ray |
| CN113219520B (en) * | 2021-05-10 | 2023-05-16 | 中国辐射防护研究院 | Radiation device and method capable of generating monopulse X-rays |
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Application publication date: 20130605 |