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GB/T 23901.3-2019: Non-destructive testing -- Image quality of radiographs -- Part 3: Image quality classes Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 23901.3: Historical versions
Similar standardsGB/T 23901.3-2019: Non-destructive testing -- Image quality of radiographs -- Part 3: Image quality classes---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23901.3-2019 Non-destructive testing--Image quality of radiographs--Part 3. Image quality classes ICS 19.100 J04 National Standards of People's Republic of China Replace GB/T 23901.3-2009 Non-destructive testing radiographic inspection image quality Part 3. Image quality classification Part 3. Imagequalityclasses (ISO 19232-3.2013, IDT) Published on.2019-06-04 2020-01-01 implementation State market supervision and administration China National Standardization Administration issued Content Foreword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 image quality level 2 5 placement of the image quality 2 6 Determination of image quality 2 7 image quality value of gamma radiography detection 2 8 Single-wall transillumination technology (source side A-level image quality) 3 9 Single-wall transillumination technology (source side B-level image quality) 4 10 double wall double shadow transillumination technology (source side A level image quality) 5 11 double wall double shadow transillumination technology (source side B quality) 6 12 double wall double shadow or double wall single shadow transillumination technology (detector side A level image quality) 7 13 double wall double shadow or double wall single shadow transillumination technology (detector side B quality) 8 ForewordGB/T 23901 "Non-destructive testing radiographic inspection image quality" is divided into five parts. ---Part 1. Determination of the image quality of the silk-type image quality meter; --- Part 2. Determination of image quality values of stepped hole image quality meters; --- Part 3. Image quality classification; --- Part 4. Experimental evaluation of image quality and image quality table; --- Part 5. Determination of image clarity of double-filament image quality. This part is the third part of GB/T 23901. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 23901.3-2009 "Non-destructive testing of radiographic film quality - Part 3. s. Class, compared with GB/T 23901.3-2009, the main changes are as follows. --- Removed the restriction on "black metal" in the range, and changed "black metal image quality classification" to "image quality classification"; --- Revised the normative reference document (see Chapter 2, Chapter 2 of the.2009 edition); ---Modified terms and definitions (see Chapter 3, Chapter 3 of the.2009 edition); --- Updated the image quality value determination method when using Ir192 and Se75, and the image quality value of gamma radiography detection (see Chapter 7, Table 1~Table 4 of the.2009 edition; --- Removed the footnotes from Table 1 to Table 12 (see Tables 1 to 12 of the.2009 edition); ---" Radiographic film quality" was changed to "radiography to detect image quality"; --- "Image quality index" was changed to "image quality value"; --- "film" changed to "detector"; --- "Linear image quality meter", changed to "silk image quality meter". This section uses the translation method equivalent to ISO 19232-3.2013 "Non-destructive testing radiographic inspection image quality Part 3. Image Quality classification. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 19802-2005 Minimum requirements for non-destructive testing of industrial radiographic viewing lamps (ISO 5580.1985, IDT) ---GB/T 19943-2005 Non-destructive testing of metal materials X and gamma radiography detection basic rules (ISO 5579. 1998, IDT) --- GB/T 23901.1-2019 Non-destructive testing - Radiographic image quality - Part 1 . s Determination (ISO 19232-1.2013, IDT) --- GB/T 23901.2-2019 Non-destructive testing - Radiographic image quality - Part 2. Stepped hole image quality image quality Determination of values (ISO 19232-2.2013, IDT) This part is proposed and managed by the National Non-Destructive Testing Standardization Technical Committee (SAC/TC56). This section drafted by. Shanghai Space Propulsion Research Institute, Shanghai Aerospace Power Technology Engineering Co., Ltd., Shanghai Materials Research Institute, Zhejiang Province Jinyun Image Quality Factory, Hubei Sanjiang Aerospace Jiangbei Machinery Engineering Co., Ltd., Matrix Science and Technology Testing Technology (Beijing) Co., Ltd., China Guangdong Nuclear Power Engineering Co., Ltd. Co., Ltd., Shanghai Aerospace Equipment Manufacturing Co., Ltd., Sichuan Aerospace Chuanan Fire Technology Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute, Shanghai Satellite Equipment Research Institute, Shanghai Feitian Zhongzhi Technology Co., Ltd., Zhejiang Special Equipment Inspection and Research Institute, Aerospace Materials and Process Research Research Institute, CITIC Daika Co., Ltd., Institute of Acoustics, Chinese Academy of Sciences, Donghai Research Station, Ningbo Special Equipment Inspection and Research Institute, Shanghai Airlines Tiantian Control Technology Research Institute, Aintik Testing Technology (Shanghai) Co., Ltd. The main drafters of this section. Chen Yiwei, Xu Guozhen, Jiang Jiansheng, Ding Jie, Liu Zhanglong, Wang Xiaoyong, Jiang Yunxi, Zhu Congbin, Xu Wei, Zhang Zheng, Zhou Jianping, Wei Wei, Sun Jianwei, Wang Daolong, Huang Wenda, Lu Yanda, Yuan Life, Liu Jun, Hu Ling, Chen Hu, Yuan Zhizuo, Zhang Rui, Zhang Yifeng, Yan Lianna, Ma Jun. The previous versions of the standards replaced by this section are. ---GB/T 23901.3-2009. Non-destructive testing radiographic inspection image quality Part 3. Image quality classification1 ScopeThis part of GB/T 23901 specifies the image quality values to be achieved during radiographic inspection to ensure the same radiographic inspection image. Quality Evaluation. This section applies to the wire-type image quality meter specified in ISO 19232-1 and the order specified in ISO 19232-2 for radiographic inspection. The ladder-type image quality meter evaluates the image quality.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 5579 Non-destructive testing of metal materials X or gamma radiographic inspection basic rules (Non-destructive testing-Ra- DiographicexaminationofmetalicmaterialsbyX-andgammarays-Basicrules) ISO 5580 Non-destructive testing industrial radiography viewing lamp minimum requirements (Non-destructive testing-Industrialradi- ographiciluminators-Minimumrequirements) ISO 17636 (all parts) Non-destructive testing of welds (Non-destructive testing ofwelds- Radiographictesting) Non-destructive testing - Radiographic image quality - Part 1 . Determination of image quality values of silk-type image quality (Non-de- structivetesting-Imagequalityofradiographs-Part 1.Determinationoftheimagequalityvalueu- Singwire-typeimagequalityindicators) Non-destructive testing - Radiographic image quality - Part 2. Determination of image quality values of stepped hole image quality (Non-destructivetesting-Imagequalityofradiographs-Part 2.Determinationoftheimagequality Valueusingstep/hole-typeimagequalityindicators)3 Terms and definitionsThe following terms and definitions defined by ISO 5579 apply to this document. 3.1 Image quality image qualityindicator; IQI The ability to measure the quality of the image, consisting of a series of different grades of wire or a stepped hole. Note. The image quality indicator can also be expressed by image quality indicator and IQI. The image quality type is usually a wire type or a stepped hole type. 3.2 Image quality value Expressed as a requirement to determine or achieve the most fine or smallest pore identifiable on the radiographic image of the image quality. Note. Image quality values can also be expressed in terms of image quality values and IQI sensitivity (IQIsensitivity). The image quality values are shown in Table 1 to Table 12. 3.3 Image quality table A summary of the image quality values required to correspond to the transillumination thickness.4 image quality level4.1 Single wall transillumination Meet the ISO 5579 testing requirements, can reach the image quality level of Table 1 ~ Table 4. a) for Class A radiographic inspection techniques, corresponding to Class A image quality (see ISO 5579); b) For Class B radiographic inspection techniques, corresponding to Class B image quality (see ISO 5579). The image quality values given in Tables 1 to 4 are used when the image quality meter is placed in the source. If the image quality meter cannot be placed in the source, it can be placed in the probe. On the side of the device, Tables 1 to 4 cannot be used in this case. Note. For special transillumination (for example, using Ir192 to transilluminate thin-walled workpieces), different image quality values can be selected as specified, see Chapter 7. 4.2 Double wall transillumination The ISO 5579 inspection requirements are met to achieve the image quality levels in Tables 5 through 12. a) for Class A radiographic inspection techniques, corresponding to Class A image quality (see ISO 5579); b) For Class B radiographic inspection techniques, corresponding to Class B image quality (see ISO 5579). Note. For special transillumination (for example, using Ir192 to illuminate thin-plate workpieces), different image quality values can be selected as specified, see Chapter 7. When a double-wall transillumination line photography technique is employed, the transillumination thickness w is the sum of the nominal thickness t of the workpiece through which the radiation penetrates. The image quality values shown in Tables 5 to 8 apply to the A-level and B-level image quality levels of the double-walled double-shadow transillumination method when the image quality meter is placed on the source side. The image quality values shown in Tables 9 to 12 are applicable to the A-level and B-level image quality of the double-wall single-shadow transillumination method when the image quality meter is placed on the detector side. Level, also applicable to the A-level and B-level image quality levels of the double-walled double-shadow transillumination method when the quality meter is placed on the detector side, as in ISO 17636. Line elliptical transillumination detection.5 placement of the image quality meterFor radiographic inspection, the image quality meter should be placed on the source side surface of the workpiece to be inspected. When the source side surface of the workpiece to be inspected cannot be placed in the image quality meter When the image quality meter can be placed on the detector side of the workpiece to be inspected, the word "F" should be placed near the image meter to distinguish it. The image quality meter should be placed in the work A relatively uniform thickness of the area. If there are special requirements, it should be carried out according to the standards adopted.6 Determination of image qualityWith film radiographic inspection, when determining the image quality, the viewing conditions should meet the requirements of ISO 5580. For a silk-type image quality meter, the number of the finest filaments that can be recognized on the image is the image quality value. When the image density (or grayscale) is uniform When a continuous wire image having a length of not less than 10 mm is clearly recognized, the image of the wire is considered to be identifiable. For a stepped hole type image quality meter, the number of the smallest hole that can be recognized on the film is the image quality value. When there are two holes on the same ladder, Both holes should be identifiable on the image. In general, each radiographic test should verify that the quality of the test meets the requirements by determining the image quality value. Similar in transillumination When the workpiece and area are inspected, if the same exposure and processing techniques are used to ensure that the resulting image quality values are not different, then no need is required. To verify the quality of each image, the scope of verification of image quality is agreed upon by the parties to the contract.7 Image quality values detected by gamma radiographyWhen using Ir192 or Se75 for radiographic inspection, if the parties agree to the following regulations, the obtained image quality value may be lower than Table 1~ Table 12 specifies. Double wall double shadow transillumination method (Table 5~ Table 8), transillumination thickness (w), image quality level including A grade and B grade. ---Use Ir192, 10mm \u003cw≤25mm,允许像质值减少1; ---Use Se75, 5mm \u003cw≤12mm,允许像质值减少1。 Single wall single shadow transillumination method and double wall single shadow transillumination method (Table 1, Table 2, Table 9 and Table 10), transillumination thickness (w), image quality level is Class A. ---Use Ir192, 10mm \u003cw≤24mm,允许像质值减少2; ---Use Ir192, 24mm \u003cw≤30mm,允许像质值减少1; ---Use Se75, 5mm \u003cw≤24mm,允许像质值减少1。 Single wall single shadow transillumination method and double wall single shadow transillumination method (Table 3, Table 4, Table 11 and Table 12), transillumination thickness (w), image quality level is Level B. ---Use Ir192, 10mm \u003cw≤40mm,允许像质值减少1; ---Use Se75, 5mm \u003cw≤20mm,允许像质值减少1。 8 single-wall transillumination technology (source side A-level image quality) The A-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Tables 1 to 2. Table 1 Silk quality image quality Class A image quality Nominal thickness t/mm image quality value T≤1.2 W18 1.2 \u003ct≤2 W17 2 \u003ct≤3.5 W16 3.5 \u003ct≤5 W15 5 \u003ct≤7 W14 7 \u003ct≤10 W13 10 \u003ct≤15 W12 15 \u003ct≤25 W11 25 \u003ct≤32 W10 32 \u003ct≤40 W9 40 \u003ct≤55 W8 55 \u003ct≤85 W7 85 \u003ct≤150 W6 150 \u003ct≤250 W5 t >250 W4 Table 2 Stepped hole image quality image quality Class A image quality Nominal thickness t/mm image quality value T≤2 H3 2 \u003ct≤3.5 H4 3.5 \u003ct≤6 H5 6 \u003ct≤10 H6 10 \u003ct≤15 H7 15 \u003ct≤24 H8 twenty four \u003ct≤30 H9 30 \u003ct≤40 H10 40 \u003ct≤60 H11 60 \u003ct≤100 H12 100 \u003ct≤150 H13 150 \u003ct≤200 H14 200 \u003ct≤250 H15 250 \u003ct≤320 H16 320 \u003ct≤400 H17 t >400 H18 9 single-wall transillumination technology (source side B-level image quality) The B-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Tables 3 to 4. Table 3 Silk quality image quality Class B image quality Nominal thickness t/mm image quality value T≤1.5 W19 1.5 \u003ct≤2.5 W18 2.5 \u003ct≤4 W17 4 \u003ct≤6 W16 6 \u003ct≤8 W15 8 \u003ct≤12 W14 12 \u003ct≤20 W13 20 \u003ct≤30 W12 30 \u003ct≤35 W11 Table 3 (continued) Class B image quality Nominal thickness t/mm image quality value 35 \u003ct≤45 W10 45 \u003ct≤65 W9 65 \u003ct≤120 W8 120 \u003ct≤200 W7 200 \u003ct≤350 W6 t >350 W5 Table 4 Stepped hole image quality image quality Class B image quality Nominal thickness t/mm image quality value T≤2.5 H2 2.5 \u003ct≤4 H3 4 \u003ct≤8 H4 8 \u003ct≤12 H5 12 \u003ct≤20 H6 20 \u003ct≤30 H7 30 \u003ct≤40 H8 40 \u003ct≤60 H9 60 \u003ct≤80 H10 80 \u003ct≤100 H11 100 \u003ct≤150 H12 150 \u003ct≤200 H13 200 \u003ct≤250 H14 10 double wall double shadow transillumination technology (source side A level image quality) The A-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Table 5 to Table 6. Table 5 Silk quality image quality Class A image quality Transillumination thickness w/mm image quality value W≤1.2 W18 1.2 \u003cw≤2 W17 Table 5 (continued) Class A image quality Transillumination thickness w/mm image quality value 2 \u003cw≤3.5 W16 3.5 \u003cw≤5 W15 5 \u003cw≤7 W14 7 \u003cw≤12 W13 12 \u003cw≤18 W12 18 \u003cw≤30 W11 30 \u003cw≤40 W10 40 \u003cw≤50 W9 50 \u003cw≤60 W8 60 \u003cw≤85 W7 85 \u003cw≤120 W6 120 \u003cw≤220 W5 220 \u003cw≤380 W4 w >380 W3 Table 6 Stepped hole image quality image quality Class A image quality Transillumination thickness w/mm image quality value W≤1 H3 1 \u003cw≤2 H4 2 \u003cw≤3.5 H5 3.5 \u003cw≤5.5 H6 5.5 \u003cw≤10 H7 10 \u003cw≤19 H8 19 \u003cw≤35 H9 11 double wall double shadow transillumination technology (source side B level image quality) The B-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Table 7 to Table 8. Table 7 Silk quality image quality Class B image quality Transillumination thickness w/mm image quality value W≤1.5 W19 1.5 \u003cw≤2.5 W18 2.5 \u003cw≤4 W17 4 \u003cw≤6 W16 6 \u003cw≤8 W15 8 \u003cw≤15 W14 15 \u003cw≤25 W13 25 \u003cw≤38 W12 38 \u003cw≤45 W11 45 \u003cw≤55 W10 55 \u003cw≤70 W9 70 \u003cw≤100 W8 100 \u003cw≤170 W7 170 \u003cw≤250 W6 w >250 W5 Table 8 Stepped hole image quality image quality Class B image quality Transillumination thickness w/mm image quality value W≤1 H2 1 \u003cw≤2.5 H3 2.5 \u003cw≤4 H4 4 \u003cw≤6 H5 6 \u003cw≤11 H6 11 \u003cw≤20 H7 20 \u003cw≤35 H8 12 double wall double shadow or double wall single shadow transillumination technology (detector side A level image quality) The image quality meter is placed on the detector side, and the A-level image quality values to be achieved are shown in Table 9 to Table 10. Table 9 Silk quality image quality Class A image quality Transillumination thickness w/mm image quality value W≤1.2 W18 1.2 \u003cw≤2 W17 2 \u003cw≤3.5 W16 3.5 \u003cw≤5 W15 5 \u003cw≤10 W14 10 \u003cw≤15 W13 15 \u003cw≤22 W12 twenty two \u003cw≤38 W11 38 \u003cw≤48 W10 48 \u003cw≤60 W9 60 \u003cw≤85 W8 85 \u003cw≤125 W7 125 \u003cw≤225 W6 225 \u003cw≤375 W5 w >375 W4 Table 10 Stepped hole image quality image quality Class A image quality Transillumination thickness w/mm image quality value W≤2 H3 2 \u003cw≤5 H4 5 \u003cw≤9 H5 9 \u003cw≤14 H6 14 \u003cw≤22 H7 twenty two \u003cw≤36 H8 36 \u003cw≤50 H9 50 \u003cw≤80 H10 13 double wall double shadow or double wall single shadow transillumination technology (detector side B level image quality) The image quality values of the B-class that should be achieved on the detector side are shown in Table 11 to Table 12. Table 11 Silk quality image quality Class B image quality Transillumination thickness w/mm image quality value W≤1.5 W19 1.5 \u003cw≤2.5 W18 2.5 \u003cw≤4 W17 4 \u003cw≤6 W16 6 \u003cw≤12 W15 12 \u003cw≤18 W14 18 \u003cw≤30 W13 30 \u003cw≤45 W12 45 \u003cw≤55 W11 55 \u003cw≤70 W10 70 \u003cw≤100 W9 100 \u003cw≤180 W8 180 \u003cw≤300 W7 w >300 W6 Table 12 Stepped hole image quality image quality Class B image quality Transillumination thickness w/mm image quality value W≤2.5 H2 2.5 \u003cw≤5.5 H3 5.5 \u003cw≤9.5 H4 9.5 \u003cw≤15 H5 15 \u003cw≤24 H6 twenty four \u003cw≤40 H7 40 \u003cw≤60 H8 60 \u003cw≤80 H9 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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