CN113804708A - A method for testing shielding performance of X-ray shielding materials - Google Patents
A method for testing shielding performance of X-ray shielding materials Download PDFInfo
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- CN113804708A CN113804708A CN202111000064.8A CN202111000064A CN113804708A CN 113804708 A CN113804708 A CN 113804708A CN 202111000064 A CN202111000064 A CN 202111000064A CN 113804708 A CN113804708 A CN 113804708A
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 14
- 230000000694 effects Effects 0.000 claims abstract description 3
- 238000003745 diagnosis Methods 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000002601 radiography Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
本发明公开了一种X射线屏蔽材料的屏蔽性能测试方法，属于屏蔽材料性能测试技术领域，该方法为：使用医院X线摄影(DR)设备对X射线屏蔽材料和不同厚度铅板进行照射并得到影像图，分析对比影像图中X射线屏蔽材料和铅板的白度，两者相比得到等于或稍大于1的值说明X射线屏蔽材料能够达到与铅板相同的屏蔽效果，此时铅板的厚度等于X射线屏蔽材料的铅当量。该测试方法利用现有设备进行测试，简单方便，能够快速进行X射线屏蔽材料的屏蔽性能鉴定，有利于实验的推进和研究。
The invention discloses a shielding performance testing method of X-ray shielding materials, belonging to the technical field of shielding material performance testing. Obtain the image, analyze and compare the whiteness of the X-ray shielding material and the lead plate in the image, and compare the two to obtain a value equal to or slightly greater than 1, indicating that the X-ray shielding material can achieve the same shielding effect as the lead plate. The thickness of the plate is equal to the lead equivalent of the X-ray shielding material. The testing method utilizes the existing equipment for testing, which is simple and convenient, can quickly perform the shielding performance identification of the X-ray shielding material, and is beneficial to the advancement and research of the experiment.
Description
Technical Field
The invention belongs to the technical field of performance test of shielding materials, and particularly relates to a method for testing shielding performance of an X-ray shielding material.
Background
The X-ray is applied to medical diagnosis and treatment, industrial flaw detection, element analysis and the like due to the unique characteristics, and brings convenience to the life of people. However, since X-rays have strong penetrating power, when people receive overdose of radiation or are in a radiation environment for a long time, serious damage can be caused to human bodies. Therefore, an X-ray shielding material is required to shield X-rays harmful to the relevant practitioner. Development of X-ray shielding materials, the testing of shielding properties thereof, is inevitable.
The current main testing means is composed of an X-ray machine and a current integrating dosimeter. However, when the shielding performance of the X-ray shielding material is tested under a high energy condition, the X-ray is harmful to the human body, and the test is performed in an isolation room with a shielding function, which brings great inconvenience. Therefore, the existing resources of hospitals are utilized to cooperate with the hospitals to test the shielding performance of the X-ray shielding material in practical application, the shielding performance of the X-ray shielding material can be intuitively and simply judged, and the experimental process is effectively promoted.
Disclosure of Invention
Aiming at the defect and the problem that the shielding performance of the X-ray shielding material is difficult to test in the prior art, the invention aims to provide a method for testing the shielding performance of the X-ray shielding material.
The invention is realized by the following technical scheme:
a method for testing shielding performance of X-ray shielding material comprises placing X-ray shielding material and lead plates with different thicknesses in diagnostic region of X-ray diagnostic equipment, and changing X-ray energy by computer to obtain corresponding medical image; and analyzing and comparing the whiteness of the X-ray shielding material and the lead plate in the images corresponding to different energies to obtain the thickness of the lead plate effect, namely the lead equivalent, of the X-ray shielding material in the energy range.
When the X-ray interacts with the substance, on one hand, energy is continuously lost, and on the other hand, the substance absorbs the energy of the X-ray to ionize or excite electrons on the outer layer of the atomic nucleus, which is the basis of X-ray detection. The kerma is the quotient of the initial sum of kinetic energies dEtr of all secondary electrons released by the interaction of the uncharged electro-particles in the mass dm of the substance divided by the unit mass dm. When the defined substance is air, the measured quantity is the air kerma.
The medical X-ray diagnosis is that according to the different absorption degrees of different tissues and organs of a human body to X-rays, when a beam of X-rays with uniform intensity passes through, the internal structure information of the X-ray diagnosis presents a corresponding image according to the transmission level. Nowadays, medical X-ray diagnostic apparatuses mainly use Computed Radiography (CR), Digital Radiography (DR), and X-ray computed tomography (X-CT).
CT is to scan the layer with certain thickness of a certain part of a human body; CR and DR have X-ray sensitivity and dynamic range much larger than that of the conventional X-ray photographic equipment, so that X-ray dose in examination can be greatly reduced, but DR directly transmits digital information to an image workstation through a flat panel detector, and CR uses an IP plate; the DR apparatus is preferably used as the medical X-ray diagnostic apparatus of the present invention.
The inspection device specified in the national standard X-ray protective material shielding performance and inspection method consists of an X-ray generating device, radiation beam filtering, a diaphragm and a radiation detector; the measuring method is that the radiation detector obtains the air kerma which is not attenuated by the detected sample and is attenuated by the detected sample, and then the lead equivalent is calculated by drawing or least square method. The Digital Radiography (DR) mainly comprises a power supply assembly, a control system assembly, an X-ray bulb tube, a high-voltage system, a flat panel detector, an interface circuit, a digital system workstation, system management software and image processing function software. The core components of DR are mainly X-ray bulb tube, high-voltage system and flat panel detector, which plays a decisive role in DR imaging quality. The working principle of the device is the same as the detection principle of the shielding performance and the detection method of the national standard X-ray protective material, but a flat panel detector converts photoelectric signals into digital signals and forms X-ray digital images through the image processing of a computer.
The method uses DR equipment, places X-ray shielding materials to be tested and Pb plates with the thickness of 0.2-0.5mm in a diagnosis area of the X-ray diagnosis equipment in a classified mode according to rows or columns, obtains series of images of the X-ray shielding materials and the lead plates under different energy conditions by adjusting X-ray excitation voltage through a computer end, enables other conditions of the same material under different energy conditions to be consistent by adjusting the resolution of the images through the computer, and reduces influence factors on results; and calibrating the whiteness of the X-ray shielding material and the lead plate in the image by using Photoshop, wherein the whiteness of the X-ray shielding material is compared with the whiteness of the lead plate with different thicknesses to obtain a value, the ratio under each energy is connected to form a curve, and if the curve is 1 or slightly larger than 1, the shielding performance lead equivalent of the shielding material is equal to the thickness of the lead plate, so that the shielding performance test result of the X-ray shielding material is obtained.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts hospital X-ray photography (DR), utilizes the image imaging principle to detect the shielding performance of the X-ray shielding material, can quickly and effectively obtain the detection result, and can protect the safety of detection personnel.
(2) The invention solves the problem of building a protection room for testing the shielding performance of a specific X-ray shielding material and solves the problem of difficult testing.
Drawings
FIG. 1 is a schematic view showing the arrangement of an X-ray shielding material and a lead plate according to example 1 of the present invention;
FIG. 2 is an image of the X-ray shielding material and the lead plate of example 1 of the present invention under a condition of 60 KeV;
FIG. 3 is a graph showing whiteness ratio of a lead plate of the X-ray shielding material according to example 1 of the present invention over the entire energy range.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Experimental example 1:
1) placing the prepared X-ray shielding materials and lead plates with the thicknesses of 0.2mm, 0.3mm, 0.4mm and 0.5mm in a diagnosis area of the DR equipment according to a graph 1;
2) controlling the energy of X-rays through a computer terminal of the DR equipment to obtain images under different energy conditions, as shown in FIG. 2;
3) setting the main element conditions of each image map to be the same value through image processing function software;
4) calibrating the whiteness of the X-ray shielding material and the lead plate in the image by using Photoshop, and obtaining the ratio of the whiteness of the X-ray shielding material to the whiteness of the lead plates with different thicknesses, as shown in FIG. 3;
5) as can be seen from FIG. 3, the lead equivalent of the X-ray shielding material Z-A-2 was 0.5 mmPb.
The foregoing merely represents preferred embodiments of the invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A method for testing the shielding performance of an X-ray shielding material is characterized by comprising the following steps: placing an X-ray shielding material and lead plates with different thicknesses in a diagnosis area of X-ray diagnosis equipment, and changing the energy of X-rays through a computer to obtain a corresponding medical image; and analyzing and comparing the whiteness of the X-ray shielding material and the lead plate in the images corresponding to different energies to obtain the thickness of the lead plate effect, namely the lead equivalent, of the X-ray shielding material in the energy range.
2. The method for testing shielding performance of an X-ray shielding material according to claim 1, wherein the X-ray diagnostic apparatus is a DR apparatus.
3. The method for testing shielding performance of an X-ray shielding material according to claim 1, wherein: the X-ray shielding material and the lead plates with different thicknesses are placed in the diagnosis area in a classified manner according to rows or columns, and simultaneously, the test is carried out to obtain an image.
4. The method for testing shielding performance of an X-ray shielding material according to claim 1, wherein: the thickness of the lead plate is 0.2 mm-0.5 mm.
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| CN202111000064.8A CN113804708A (en) | 2021-08-28 | 2021-08-28 | A method for testing shielding performance of X-ray shielding materials |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030063704A1 (en) * | 2000-08-29 | 2003-04-03 | Philipp Lang | Methods and devices for quantitative analysis of x-ray images |
| US20100119037A1 (en) * | 2007-04-23 | 2010-05-13 | Kabushiki Kaisha Toshiba | Nondestructive identification method and nondestructive identification device |
| US20110165269A1 (en) * | 2010-01-07 | 2011-07-07 | BLoXR, LLC | Radiation Protection System |
| CN107437438A (en) * | 2010-01-07 | 2017-12-05 | Bloxr解决方案有限责任公司 | Radiation protection system |
| KR20190052502A (en) * | 2017-11-08 | 2019-05-16 | 대구가톨릭대학교산학협력단 | Evaluation of radiation shielding sheets using x-ray imaging equipment |
-
2021
- 2021-08-28 CN CN202111000064.8A patent/CN113804708A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030063704A1 (en) * | 2000-08-29 | 2003-04-03 | Philipp Lang | Methods and devices for quantitative analysis of x-ray images |
| US20100119037A1 (en) * | 2007-04-23 | 2010-05-13 | Kabushiki Kaisha Toshiba | Nondestructive identification method and nondestructive identification device |
| US20110165269A1 (en) * | 2010-01-07 | 2011-07-07 | BLoXR, LLC | Radiation Protection System |
| CN107437438A (en) * | 2010-01-07 | 2017-12-05 | Bloxr解决方案有限责任公司 | Radiation protection system |
| KR20190052502A (en) * | 2017-11-08 | 2019-05-16 | 대구가톨릭대학교산학협력단 | Evaluation of radiation shielding sheets using x-ray imaging equipment |
Non-Patent Citations (1)
| Title |
|---|
| 邢健 等: "《全国普通高等医学院校五年制临床医学专业"十三五"规划教材 医学影像学》", 30 November 2016 * |
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