CN105717141A - Method for detecting protection performance of cream type materials on X-ray radiation - Google Patents
Method for detecting protection performance of cream type materials on X-ray radiation Download PDFInfo
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Abstract
Provided is a method for detecting the protection performance of cream type materials on X-ray radiation. The method is characterized by comprising the following steps that firstly, the cream type materials with different concentrations are prepared; secondly, the interior of a detecting mold is coated with the cream materials with different concentrations, and detecting specimens with different thicknesses are obtained, and the detecting specimens made from the cream materials with different concentrations are correspondingly equal in thickness; thirdly, the detecting specimen of each concentration is placed between X-ray emitting equipment and X-ray detecting equipment for testing; fourthly, detecting results are subjected to statistics and disposal, and the optimal cream type material coating thickness under different irradiation voltages and different irradiation times is obtained. The method is simple and easy to achieve.
Description
Technical field
The present invention relates to a kind of medical protection technology, especially a kind of X-ray protection technology, specifically a kind of frost shaped material is to x-ray radiation barrier propterty detection method.
Background technology
At present, it is frequently necessary in every-day medical and army's emergency guarantee or in field work, training use X-ray machine or mobile CT, and both of which has x-ray ionizing radiation, human body can be produced many-sided impact by this: the impact of short-term can cause alopecia, cataract, dizziness and nausea, Skin peeling, diarrhoea, loss of appetite；Being under ionization radiation irradiation and the DNA in nucleus can be made to be destroyed, wherein the DNA in sexual cell can cause baby's congenital development deformity after destroying, and somatic cell can become tumor cell by abnormal growth after destroying, and hematoclasis can leukemogenesis.Wherein carcinogenic, teratogenesis and 3 kinds of negative effects of sudden change become the most concerned problem of people.Ionizing radiation is inducible factor and the exciting agent of canceration, and X ray has been classified as the carcinogenic factor of the 1st class by World Health Organization (WHO).Wherein risk factor that is carcinogenic and that take a hereditary disease is: 7.6% × equivalence unit dosage/10000, and as abdominal CT scan checks that equivalence unit dosage is 8mSv, then this time CT examination is carcinogenic and to take a hereditary disease as probability be 6/10000；It is 2.5 hundred million times that current China accepts X-ray examination total degree every year, accounts for 20% (total population by 12.5 hundred million) of total population.Nearly 10 years, the installation amount of each department x-ray equipment increased in various degree, carries out various x-ray inspection crowd and increases, the radiation threat of crowd's potentiality be can not be ignored.There are bibliographical information, CT examination to account for the 15% of all imaging examinations, but it brings the radiation dose of crowd and accounts for 70%.ICRP proposes, and accepting x-ray radiation dosage often increases 1mSv and will cause suffering from the probability of malignant tumor and increase by 5/,100,000, therefore how effectively to implement ionization and protects most important.
At present in the routine work of hospital, lead protection is ionization radiation protection means common during x-ray checks.Frequently with article such as plumbous clothing, lead apron, plumbous muffler, plumbous glasses, x-ray is protected clinically, reduce the radiation dose suffered by human body as far as possible.X-ray and material are had an effect, it is possible to being absorbed and scattering, namely ray is had shielding action by material, for x-ray, material (such as plumbous) effect high by atomic number is better, in real work, it is necessary to select shielding material according to situations such as the intensity of ray, purposes and operations.In the ideal case, x-ray weakening in material is to defer to simple index number attenuation law, N=N0E-μd, N and N0Representing that, through the number of photons that material is forward and backward, d is the thickness of material layer respectively, μ is x-ray line attenuation coefficient in this material, relevant with incident photon energy and material atom ordinal number.And, research finds, the absorption size of x-ray energy is directly proportional to 4 powers of the atomic number of absorbing material, and plumbous atomic number is 82, therefore has the absorbability of good X ray.But use plumbous have several disadvantages in that 1 as protective material, the quality of a normal plumbous clothing is more than 15Kg, also do not include the protective gears such as plumbous muffler and plumbous glasses, it is undoubtedly a bigger physical ability burden for the doctor in intervention operation, particularly operate for a long time, influence whether the agility of doctor, thus having influence on the effect of operation.2, the lead protection articles for use such as plumbous clothing, lead apron, plumbous muffler can not fold when placing, and otherwise easily produces, at angle folding, the phenomenon that x-ray protection effect declines.3, sheet lead is as the protective material of CT or DSA machine room, the impact of the vibration As time goes on caused and sheet lead self gravitation, and X-ray protection hydraulic performance decline even thread cast-off easily occurs for place or junction that sheet lead is fixing.4, lead is harmful, 2006, European Union enforces the regulation of " about prohibitting the use of some Hazardous Substances Directive in electronic electric equipment ", completely forbidding and use 6 kinds of harmful substances such as plumbous hydrargyrum cadmium in electronic and electrical equipment, green, environmental-friendly lead-free trend will become the theme of all electronics manufacturings.5, with existing lead protection clothes or material, the arm protection getting involved doctor is inadequate, temporarily without special arm preventer, and owing to plumbous weight is big, even if making glove also can affect the motility getting involved operation and the body burden adding doctor.
Therefore, on-the-spot protection and the protection to doctor and other staff it are difficult to existing x-ray radiation safeguard procedures and method.Using X-ray machine more and more frequent in clinical and military emergency guarantee or under field condition, Portable movable X-ray machine is allotted more in military emergency guarantee especially now.And lead protection weight is very much not portable.Therefore, the x-ray protection material studying applicable military emergency guarantee that is lighter, more portable and that launch is extremely important.
From above-mentioned x-ray radiation preventing principle it can be seen that the possible radiation protection ability of the atom bigger than lead atom ordinal number is more higher than lead.And the atomic number of bismuth is 83, bigger than plumbous atomic number 82.Being additionally, since plumbous poisonous, bismuth has replaced lead, plays an increasingly important role in the radiation shield of the pb-free solder of electronics industry, Thermal Cutoffs, fire-fighting fusible plug, TV and computer screen.Up-to-date exploration shows, China has abundant bismuth resource, is a bismuth great industry nation, and proved reserves account for the 70% of world's gross reserves.A kind of very safe nontoxic heavily the belonging to that bismuth is generally acknowledged as the whole world, at normal temperatures can stable existence.Bismuth had both had covalent bond, has again and can belong to key characteristic, and this structures shape bismuth has the physical and chemical performance of a series of uniqueness, the wherein compound oxidation bismuth (Bi of bismuth2O3) it is a kind of important functional material, Bi2O3Can be used for interposing catheter coated inside, manufacture the raw material of prosthese, bone implant, medical suture etc., can develop under x-ray bombardment, and nontoxic, without carcinogenesis, can be made into paste and be directly used in and smear the radiation protecting x-ray.Owing to the attenuation coefficient of bismuth is bigger than lead, Bi2O3Material as anti-gamma-ray is applied in glass.Plumbous density is 11.3437g/cm3, the Bi of sterling2O3One of main uses can as photoelectric material, density is 8.9g/cm3。
For this, Chinese patent 2016100497155 discloses a kind of with Bi2O3White type smears for raw material, the position of exposing to the open air being coated on medical personnel has good protection effect, but owing to not having corresponding detection method to carry out barrier propterty detection, coating thickness cannot be determined and irradiate voltage, relation between the time, cause that it is subject to certain restrictions in clinical practice, therefore, detection method and the corresponding detecting device of inventing this type of frost shaped material barrier propterty a kind of just seem very necessary.
Summary of the invention
It is an object of the invention to for lack at present frost shaped material barrier propterty and coating thickness, voltage, relation between the time and be difficult to the problem of larger scale clinical applied research, invention a kind of frost shaped material is to x-ray radiation barrier propterty detection method.
The technical scheme is that
A kind of frost shaped material, to x-ray radiation barrier propterty detection method, is characterized in that it comprises the following steps:
First, the white shaped material of variable concentrations is prepared；
Secondly, it is respectively coated in detection mould with the white shaped material of each concentration, obtains the detection specimen of different-thickness；The thickness correspondence of the detection specimen that the white shaped material of variable concentrations makes gained is identical；
3rd, the detection specimen of each concentration is placed between X-ray emission equipment and X-ray detecting equipment, carries out following test respectively:
1. different irradiation voltages, the X-ray transparent dose measurement under the same illumination time；Obtain each concentration, each coating thickness X-ray transparent dosage under different voltages, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；
2. same illumination voltage, the X-ray transparent dose measurement under different irradiation times；Obtain each concentration, each coating thickness X-ray transparent dosage under different irradiation times, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；
4th, testing result is carried out sorting-out in statistics, obtains best frost shaped material coating thickness under different irradiation voltage, different irradiation time, operation medical care precess code uses.
Described white shaped material is Bi2O3Preparation.
Bi in described white shaped material2O3The percentage by weight respectively 40%, 50%, 60%, 70% of concentration.
Described irradiation voltage respectively 70kV, 80kV, 90kV, 100kV, 110kV；Irradiation time is 10mAs, 40mAs, 80mAs respectively.
Thickness respectively 0.1mm, 0.2mm, 0.3mm, 0.4mm of described detection specimen.
Described detection mould includes at the bottom of mould 1 and die cap 2, and at the bottom of described mould, 1 is provided with a groove 3 forming coating layer, and the inner surface of described die cap 2 is provided with the projection 5 matched with described groove 3, and the concentration of groove 3 deducts the height of protruding 5 and is the thickness of coating layer；Described die cap 2 is provided with through the upper air-vent 4 of top and bottom.
Described projection 5 has at least one side to leave the gap for frost shaped material effusion after being pressed in groove 3.
Groove depth dimensions at the bottom of described mould is constant, and die cap is that seriation is arranged, the height of the projection 5 on different die caps is different, or the height of the projection 5 on die cap is adjusted by increasing or reduce number of laminations, in order to obtain the detection sample of different-thickness.
The described height of projection on die cap is constant, and the groove at the bottom of mould is that seriation is arranged, the degree of depth of the groove at the bottom of different moulds is different, or at the bottom of mould on the degree of depth of groove be adjusted by increasing or reduce number of laminations, in order to obtain the detection sample of different-thickness.
The thickness of described lamination is 0.1mm.
Beneficial effects of the present invention:
The popularization and application that the present invention is frost shaped material are laid a good foundation, and specifically apply for it and provide theoretical foundation, provide reference material on the other hand for operator's protection.Not only alleviate medical personnel's work load, improve the motility of operation, and radiation hazradial bundle can be greatly lowered, ensure that medical personnel's is healthy.
The inventive method is simple, easy, easy to operate, can be used for the detection of all frost shaped materials, different-thickness.
Experiment proves under 100kV, 16mAs, by Bi2O3Based on the paste protective material tentatively made when spreading upon in the template that homemade thickness is 0.1mm, the do.se fall measured has reached 50%, during smearing thickness 0.2mm, do.se fall has reached 80%, during smearing thickness 0.3mm, do.se fall has reached 85%, and during smearing thickness 0.4mm, do.se fall has reached 87%.Dose relationship curve such as Fig. 1 after its coating thickness and decay.
The present invention is applicable not only to Bi2O3Frost shaped material, and it is applicable to the detection of other frost shaped material, the performance detection for this type of material provides feasible method and means.
Accompanying drawing explanation
Fig. 1 is that the present invention tests gained Bi2O3The dose relationship schematic diagram measured after protective material coating layer thickness (0.1-0.4mm) and decay.
Fig. 2 is the structural representation at the bottom of mould in the detection mould of the present invention.
Fig. 3 is the structural representation of the die cap in the detection oil mould of the present invention.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the testing process schematic diagram of the present invention.
Fig. 6 detects wardrobe for lead protective clothes and frost shaped material protection effect experiment process schematic diagram respectively by the method for the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in figures 1 to 6.
A kind of frost shaped material is to x-ray radiation barrier propterty detection method, and it comprises the following steps:
First, compound concentration (percentage by weight, lower with) respectively 40%, 50%, 60%, 70% Bi2O3Frost shaped material；
Secondly, it is the Bi with 40%, 50%, 60%, 70% by concentration respectively2O3Frost shaped material is coated in the detection mould shown in Fig. 2-4, and each concentration is respectively coated totally 16, the detection mould obtaining thickness 0.1mm, 0.2mm, 0.3mm, 0.4mm, as detection specimen；Described each detection mould structure is identical, it includes at the bottom of mould 1 and die cap 2, at the bottom of described mould, 1 is provided with a groove 3 forming coating layer, and the inner surface of described die cap 2 is provided with the projection 5 matched with described groove 3, and the concentration of groove 3 deducts the height of protruding 5 and is the thickness of coating layer；Being provided with through the upper air-vent 4 of top and bottom on described die cap 2, described projection 5 has at least one side to leave the gap for frost shaped material effusion after being pressed in groove 3.In order to obtain the coating cream of different-thickness, groove depth dimensions at the bottom of mould can remain unchanged, making die cap is that seriation is arranged, the height of the projection 5 on different die caps is different, also the height that can make the projection 5 on die cap is adjusted by increasing or reduce lamination (thickness can be 1 millimeter) quantity, in order to obtain the detection sample of different-thickness；Similarly, also the height of projection on die cap can be made constant, and making the groove at the bottom of mould is that seriation is arranged, the degree of depth of the groove at the bottom of different moulds is different, or the degree of depth of the groove at the bottom of mould is adjusted by increasing or reduce number of laminations, to obtain the detection sample (present invention devises 24 detection samples altogether) of different-thickness, mould can adopt and the zero-decrement polytetrafluoroethylene of X ray is made.
3rd, 16 detection specimen described in above-mentioned preparation are placed between X-ray emission equipment (can adopt CT, DSA or stomach and intestine machine) and X-ray detecting equipment (can adopt SiemensSomatomdefinitionFlashCT, SiemensdTADSA, SafireII stomach and intestine machine, Barracuda doser), carry out following test respectively:
1. according to radio pressure respectively 70kV, 80kV, 90kV, 100kV, 110kV, the X-ray transparent dose measurement under the same illumination time (100mAs)；Obtain each concentration, each coating thickness X-ray transparent dosage under different voltages, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；
2. same illumination voltage (as arbitrary among 70kV, 80kV, 90kV, 100kV, 110kV), the X-ray transparent dose measurement under different irradiation times (such as 10mAs, 40mAs, 80mAs etc.)；Obtain each concentration, each coating thickness X-ray transparent dosage under different irradiation times, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；Result of the test is such as shown in subordinate list 1-8.
4th, testing result is carried out sorting-out in statistics, obtains best frost shaped material coating thickness under different irradiation voltage, different irradiation time, operation medical care precess code uses.
Details are as follows:
The present invention is broadly divided into two big modules: 1, measure based on Bi under CT and DSA equipment2O3The relation that x-ray is decayed by the various different outfit concentration of radiation proof material, different smearing thickness under different exposure；2, com-parison and analysis Bi under CT and DSA equipment2O3The x-ray radiation protective capacities of radiation protection material and lead apron or plumbous clothing.
The present invention use experimental tool be respectively as follows: SiemensdTADSA, SiemensSomatomdefinitionFlashCT, SafireII stomach and intestine machine, Barracuda doser (containing CT and x-ray dose measurement module), Catphan500CT standard dose body mould, plurality of specifications be used for smear Bi2O3Radiation proof material body mould, lead apron, plumbous clothing etc..Every time before experiment, being both needed to the running status of DSA, CT and gastrointestinal machine equipment is checked, parallel manual calibration operates, and reduces other factors and experimental data is produced harmful effect.
First, Bi is inquired into2O3Relation between radiation protection material and conditions of exposure (kV, mAs).
CT:(1) kV is set to 120kV, 100kV, 80kV, 70kV, keeps mAs, Bi2O3The parameter constant such as material thickness, concentration, the change of research kV and Bi2O3Characteristic relation between material damping capacity.(2) mAs is set to 150,200,250,300,350,400, keeps kV, Bi2O3Other parameter constants such as material thickness, concentration, use Bi2O3Material wraps BarracudaCT doser, measures the radiation dose that its capped front and back receive.
Using SIEMENSSomatomDefinitionFlashCT as scanning equipment, conventionally head sequence scanning pattern is scanned, and closes CareDose4D and CarekV.Collimation width 10mm, standard thickness 10mm, reconstruction matrix 512 × 512, FOV209mm, selecting SAFIRE iterative approximation, iterations is 3, and algorithm for reconstructing is H30Smediumsmooth, window is cerebrum, with conventional head exposure dose 120kV, 200mAs reference value.The change of the x-ray dosage in acquisition CT and Bi2O3Relation between material damping capacity；Except at Bi2O3The change of the CT dosage that before and after material shields, doser detects, also can obtain the indexs such as spatial resolution, density resolution, uniformity, signal to noise ratio simultaneously, analyze the relation between these index and attenuation characteristics.
DSA or stomach and intestine machine: similar with CT detection method, kV is set to 70kV, 80kV, 90kV, 100kV, 110kV；MAs is set to 10mAs, 40mAs, 80mAs.X-ray test body mould need to be utilized during collection to obtain spatial resolution and density resolution desired value.
Secondly, Bi is inquired into2O3The radiation protection ability of radiation protection material and Bi2O3Relation between concentration.
The present invention is by changing Bi2O3The concentration of radiation protection material, concentration arranges respectively 40%, 50%, 60%, 70%, and remaining sweep parameter all remains unchanged, the method for specific embodiment, detects Bi2O3The concentration impact on its radiation protection performance.
3rd, inquire into Bi2O3The impact on its radiation protection ability of the radiation protection material coating layer thickness.
The present invention is by Bi2O3One variable of radiation protection material coating layer thickness, coating layer thickness is respectively set to 0.1mm, 0.2mm, 0.3mm, 0.4mm, and remaining sweep parameter all remains unchanged, and referring in particular to the method for embodiment, research obtains Bi2O3The coating layer thickness impact on its radiation protection performance.
The method of the present invention can be additionally used in com-parison and analysis Bi2O3The radiation protection ability of radiation protection material and lead protection articles for use.
As shown in Figure 6, lead apron or plumbous clothing is used to cover Barracuda doser and Catphan500 standard dose body mould, and according to the method for the present invention, doser and detection die body are scanned, and measure the radiation dose that the doser in this situation is surveyed respectively, obtain the Catphan500 spatial resolution shown and density resolution simultaneously；By Bi2O3Radiation protection material covers Barracuda doser and Catphan500 standard dose body mould, regulates Bi2O3The concentration of radiation protection material and thickness, can obtain the reading of corresponding radiation dose, spatial resolution and density resolution.With SPSS16.0 statistics software, comparative analysis uses lead protection articles for use and Bi2O3Under radiation protection material, the statistics relation between the parameter such as radiation dose, spatial resolution and density resolution, Study On Lead protective characteristic and Bi2O3Relation between material protection characteristic.
The Technology Roadmap of the present invention can refer to Fig. 5-6 to carry out.
The invention solves a following difficult problem:
(1) Bi of differently configured concentration and thickness2O3Radiation protection material；
(2) Bi meeting requirement of experiment is made2O3Radiation protection material, can be used for CT dose measurement, DSA or the stomach and intestine machine dose measurement parcel to die body；
(3) Bi is determined2O3Relation between the concentration of radiation protection material, thickness and radiation dose；
(4)Bi2O3The preparation of radiation protection articles for use.
Table 140% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing mAs200mA100ms changes KV
Table 250% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing mAs200mA100ms changes KV
Table 370% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing mAs200mA100ms changes KV
Table 460% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing mAs200mA100ms changes KV
Table 5 thickness 0.4mm60% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing 80KV changes mAs
Table 6 thickness 0.4mm60% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing 100KV changes mAs
| KV | mA | ms | mAs | uGy | |
| Empty quick-fried | 105.3 | 200 | 50.41 | 10 | 313.9 |
| Block | 102.8 | 200 | 50.41 | 10 | 130.7 |
| 103.1 | 200 | 50.41 | 10 | 130.9 | |
| Empty quick-fried | 105.1 | 200 | 160.3 | 32 | 951.3 |
| Block | 105.8 | 200 | 159.8 | 32 | 407.8 |
| 105.8 | 200 | 159.8 | 32 | 404.1 |
Table 7 thickness 0.1mm60% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing 120KV changes mAs
Table 8 thickness 0.3mm70% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing 70KV changes mAs
| KV | mA | ms | mAs | uGy | |
| Empty quick-fried | 70.74 | 200 | 50.31 | 10 | 100.9 |
| Block | 70.25 | 200 | 50.31 | 10 | 24.04 |
| 70.02 | 200 | 49.93 | 10 | 24.43 | |
| Empty quick-fried | 71.9 | 200 | 140.2 | 28 | 284.6 |
| Block | 71.34 | 200 | 140.2 | 28 | 65.55 |
| 71.33 | 200 | 140.1 | 28 | 65.4 | |
| Empty quick-fried | 70.72 | 200 | 192 | 40 | 411.6 |
| Block | 70.18 | 200 | 192 | 40 | 90.89 |
| 70.24 | 200 | 191.8 | 40 | 90.76 | |
| Empty quick-fried | 71.68 | 250 | 191 | 50 | 511 |
| Block | 71.39 | 250 | 191 | 50 | 115.8 |
| 71.11 | 250 | 191 | 50 | 114.6 | |
| Empty quick-fried | 71.64 | 320 | 191 | 64 | 634.9 |
| Block | 70.84 | 320 | 191 | 64 | 146.5 |
| 70.91 | 320 | 191 | 64 | 146.8 |
Table 9 thickness 0.2mm50% concentration bismuth oxide Safire stomach and intestine machine arranges condition: fixing 90KV changes mAs
| KV | mA | ms | mAs | uGy | |
| Empty quick-fried | 90.74 | 200 | 50.31 | 10 | 256.9 |
| Block | 90.25 | 200 | 50.31 | 10 | 156.7 13 --> |
| 90.02 | 200 | 49.93 | 10 | 156.2 | |
| Empty quick-fried | 91.9 | 200 | 140.2 | 28 | 524.6 |
| Block | 91.34 | 200 | 140.2 | 28 | 424.9 |
| 91.33 | 200 | 140.1 | 28 | 423.4 | |
| Empty quick-fried | 90.72 | 200 | 192 | 40 | 561.6 |
| Block | 90.18 | 200 | 192 | 40 | 481.89 |
| 90.24 | 200 | 191.8 | 40 | 482.76 | |
| Empty quick-fried | 91.68 | 250 | 191 | 50 | 810.3 |
| Block | 91.39 | 250 | 191 | 50 | 729.8 |
| 91.11 | 250 | 191 | 50 | 728.6 | |
| Empty quick-fried | 91.64 | 320 | 191 | 64 | 1068.9 |
| Block | 90.84 | 320 | 191 | 64 | 949.5 |
| 90.91 | 320 | 191 | 64 | 948.8 |
Part that the present invention does not relate to is all same as the prior art maybe can adopt prior art to be realized.
Claims (10)
1. white shaped material is to an x-ray radiation barrier propterty detection method, it is characterized in that it comprises the following steps:
First, the white shaped material of variable concentrations is prepared；
Secondly, it is respectively coated in detection mould with the white shaped material of each concentration, obtains the detection specimen of different-thickness；The thickness correspondence of the detection specimen that the white shaped material of variable concentrations makes gained is identical；
3rd, the detection specimen of each concentration is placed between X-ray emission equipment and X-ray detecting equipment, carries out following test respectively:
1. different irradiation voltages, the X-ray transparent dose measurement under the same illumination time；Obtain each concentration, each coating thickness X-ray transparent dosage under different voltages, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；
2. same illumination voltage, the X-ray transparent dose measurement under different irradiation times；Obtain each concentration, each coating thickness X-ray transparent dosage under different irradiation times, and the empty roentgendosis that exposes compares with under same voltage, obtains the best coating thickness under this voltage to instruct clinical practice；
4th, testing result is carried out sorting-out in statistics, obtains best frost shaped material coating thickness under different irradiation voltage, different irradiation time.
2. method according to claim 1, is characterized in that described white shaped material is Bi-2O3Preparation.
3. method according to claim 1 and 2, is characterized in that Bi-in described white shaped material2O3The percentage by weight respectively 40%, 50%, 60%, 70% of concentration.
4. method according to claim 1 and 2, is characterized in that described irradiation voltage respectively 70kV, 80kV, 90kV, 100kV, 110kV；Irradiation time is 10mAs, 40mAs, 80mAs respectively.
5. method according to claim 1 and 2, is characterized in that thickness respectively 0.1mm, 0.2mm, 0.3mm, 0.4mm of described detection specimen.
6. method according to claim 1, it is characterized in that described detection mould includes (1) at the bottom of mould and die cap (2), (1) at the bottom of described mould is provided with a groove (3) forming coating layer, the inner surface of described die cap (2) is provided with the projection (5) matched with described groove (3), and the concentration of groove (3) deducts the height of projection (5) and is the thickness of coating layer；Described die cap (2) is provided with through the upper air-vent (4) of top and bottom.
7. method according to claim 6, is characterized in that having at least one side to leave the gap for frost shaped material effusion after in described projection (5) press-in groove (3).
8. method according to claim 6, it is characterized in that the groove depth dimensions at the bottom of described mould is constant, die cap is that seriation is arranged, the height of the projection (5) on different die caps is different, or the height of the projection (5) on die cap is adjusted by increasing or reduce number of laminations, in order to obtain the detection sample of different-thickness.
9. method according to claim 6, it is characterized in that the height of projection on described die cap is constant, groove at the bottom of mould is that seriation is arranged, the degree of depth of the groove at the bottom of different moulds is different, or the degree of depth of the groove at the bottom of mould is adjusted by increasing or reduce number of laminations, in order to obtain the detection sample of different-thickness.
10. according to claim 8 or claim 9 method, it is characterized in that the thickness of described lamination is 0.1mm.
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| CN111458355A (en) * | 2020-05-09 | 2020-07-28 | 中国建材检验认证集团安徽有限公司 | Method for detecting attenuation performance of X-ray protective material |
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