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GB/T 23901.1-2019 English PDF (GBT23901.1-2019)

GB/T 23901.1-2019 English PDF (GBT23901.1-2019)

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GB/T 23901.1-2019: Non-destructive testing -- Image quality of radiographs -- Part 1: Determination of the image quality value using wire-type image quality indicators

GB/T 23901.1-2019
Non-destructive testing--Image quality of radiographs--Part 1. Determination of the image quality value using wire-type image quality indicators ICS 19.100
National Standards of People's Republic of China
Replace GB/T 23901.1-2009
Non-destructive testing radiographic inspection image quality
Part 1. Determination of image quality values of silk-type image quality Part 1.Determinationoftheimagequalityvalueusingwire-typeimage
(ISO 19232-1.2013, IDT)
Published on.2019-05-10
2019-12-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword I
1 range 1
2 Normative references 1
3 Terms and Definitions 1
4 wire image quality specification 1
5 use of image quality 4
6 Determination of image quality 4
Appendix A (informative) ASTME747-04 Generalized Silk Marking Guide 6
Reference 7
GB/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 first 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 23901.1-2009 "Non-destructive testing of radiographic film quality - Part 1. Linear image quality The determination of the index, compared with GB/T 23901.1-2009, the main changes are as follows. ---Modified normative references;
---Modified terms and definitions;
---" 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-type image quality meter"; --- Added Appendix A for the conversion between the ASTM wire type image quality mark and the GB image quality wire number. This section uses the translation method equivalent to ISO 19232-1.2013 "Non-destructive testing radiographic inspection image quality Part 1. Silk Determination of the image quality value of the image quality meter.
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 23901.4-2019 Non-destructive testing - Radiographic image quality - Part 4. Image quality and image quality Evaluation (ISO 19232-4.2013, IDT)
--- GB/T 27050.1-2006 Conformity assessment supplier's declaration of conformance Part 1. General requirements (ISO /IEC 17050-1. 2004, IDT)
This part is proposed and managed by the National Non-Destructive Testing Standardization Technical Committee (SAC/TC56). This section drafted by. Shanghai Aerospace Power Technology Engineering Co., Ltd., Shanghai Space Propulsion Research Institute, China Guangdong Nuclear Engineering Co., Ltd., Lake Beisanjiang Aerospace Jiangbei Machinery Engineering Co., Ltd., Zhejiang Jinyun Image Quality Meter Factory, Matrix Science and Technology Testing Technology (Beijing) Co., Ltd., Shanghai Materials Materials Research Institute, Shanghai Aerospace Precision Machinery Research Institute, Shanghai Aerospace Equipment Manufacturing General Co., Ltd., Shanghai Satellite Equipment Research Institute, Sichuan Aerospace Chuanan Fire Technology Co., Ltd., 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. Xu Guozhen, Chen Yiwei, Jiang Jiansheng, Ding Jie, Wang Xiaoyong, Liu Zhanglong, Jiang Yunxi, Zhu Congbin, Zhou Jianping, Wei Yu, Xu Wei, Sun Jianwei, Zhang Zheng, 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 23901.1-2009.
Non-destructive testing radiographic inspection image quality
Part 1. Determination of image quality values of silk-type image quality 1 Scope
This part of GB/T 23901 specifies equipment and methods for determining the quality of radiographic images using a silk-type image quality meter. This section applies to the determination of image quality by radiographic determination using a silk-type image quality meter. 2 Normative references
The 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 5580 Non-destructive testing industrial radiography viewing lamp minimum requirements (Non-destructive testing-Industrialradi- ographiciluminators-Minimumrequirements)
ISO /IEC 17050-1 Conformity Assessment Suppliers - Conformity Assessment Part 1. General (Conformityassessment- Supplier'sdeclarationofconformity-Part 1.Generalrequirements)
ISO 19232-4 - Non-destructive testing - Radiographic image quality - Part 4. Evaluation of image quality and image quality (Non- destructivetesting-Imagequalityofradiographs-Part 4.Experimentalevaluationofimagequality Valuesandimagequalitytables)
3 Terms and definitions
The following terms and definitions apply to this document.
Image quality
Image quality
Radiographic detection image features reflecting the extent of the displayed details. 3.2
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. 3.3
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 number of the wire type image meter is shown in Table 1. 4 wire image quality specification
4.1 Image size and name
The wire type image quality meter is shown in Figure 1.
The unit is mm
l --- the length of the wire;
S---wire center spacing.
a Image quality marker area.
Figure 1 silk type image quality meter
The image quality series consists of 19 wires of different diameters with corresponding tolerances and corresponding wire numbers, see Table 1. These gold The filaments are divided into four groups with overlapping ranges, each consisting of 7 consecutively numbered wires, namely W1~W7, W6~W12, W10~ W16 and W13~W19. The seven wires in the image quality meter are arranged in parallel with each other, and the length l of the wires is 10 mm, 25 mm or 50 mm, respectively. The name of the image should include the image number, standard number, and the number of the thickest wire specified by the standard (for example. W10, see Table 1), silk material. (Example. FE) and wire length (for example. 25).
Example 1. IQIGB/T 23901.1-W10FE-25.
An image quality meter with "ISO 19232-1" or "EN462-1" is equivalent to an image quality meter with "GB/T 23901.1". Note. The wire number in this section is converted against the ASTME747-04 universal wire type mark, see Appendix A. The image quality name can be reduced to the thickest wire number and silk material. Example 2. W10FE.
Table 1 Wire number, size and tolerance in millimeters
Image quality group
W1 W6 W10 W13 wire numbered wire nominal diameter limit deviation
Wire center spacing S
× W1 3.20
× W2 2.50
× W3 2.00
9.6 1 0
7.5 1 0
× W4 1.60
× W5 1.25
× × W6 1.00
× × W7 0.80
× W8 0.63
±0.02 5 1 0
× W9 0.50
× × W10 0.40
× × W11 0.32
× × W12 0.25
× × W13 0.20
× × W14 0.16
× × W15 0.125
× × W16 0.100
× W17 0.080
× W18 0.063
× W19 0.050
4.2 Image quality material
The same set of image quality materials should be identical and embedded in materials that have a protective effect and do not affect the determination of image quality. Common image quality meter The materials are CU-copper, FE-steel, TI-titanium and AL-aluminum. Other image quality materials are SS-stainless steel, NI-nickel, ZR-zirconium and so on. Table 2 lists the image quality categories and silk materials used for the selected material group. 4.3 Image quality mark
The image quality marker area (see Figure 1) should contain the following information. a) the silky wire number (1, 6, 10 or 13) on the side of the thickest wire; b) a mark representing a silk material, for example. FE refers to steel; c) GB mark, for example. 10FEGB .
For example. 10FEGB . An image quality meter with "ISO " or "EN" is equivalent to an image quality meter with "GB ". The marking material should not produce glare in the radiographic image that may affect the image evaluation, and the attenuation should not exceed twice the maximum thickness. 4.4 Quality Assurance
Each image quality meter should be accompanied by a certificate that complies with ISO /IEC 17050-1 or is issued by a qualified laboratory and that complies with this part of the technology. Certificate of conformity for the condition. For ease of identification, manufacturers should also number and mark image quality meters. 5 use of image quality meter
5.1 Selection
The image quality meter should be selected according to the material to be inspected and the image quality value to be achieved. The attenuation factor of the silk material should be as close as possible to the attenuation coefficient of the material being tested. Table 2 lists some of the materials that can be applied to the quality meter. The listed ISO 19232-4 is selected for selection. The attenuation coefficient of the silk material shall not be higher than the attenuation coefficient of the material to be tested, when the attenuation between the two is If the difference between the numbers is too large to be used, the image quality meter should use the same silk material as the material to be inspected. When the same material quality timing is missing, Use a material with a low atomic number to customize the image quality meter instead. Table 2 Image quality categories and silk materials for selected material groups Image quality mark silk number silk material for test materials
W1CU W1~W7
W6CU W6~W12
W10CU W10~W16
W13CU W13~W19
Copper, copper, zinc, tin and alloys thereof
W1FE W1~W7
W6FE W6~W12
W10FE W10~W16
W13FE W13~W19
Iron (low alloy) ferrite material
W1TI W1~W7
W6TI W6~W12
W10TI W10~W16
W13TI W13~W19
Titanium titanium and its alloys
W1AL W1~W7
W6AL W6~W12
W10AL W10~W16
W13AL W13~W19
Aluminum aluminum and its alloys
5.2 Placement of the image quality meter
For radiographic inspection, the image quality meter should be placed on the source side surface of the workpiece to be inspected. When the image side surface of the workpiece to be inspected cannot be placed in the image quality timing, the image quality meter can be placed on the detector side of the workpiece to be inspected, but near the image quality meter. The typeface "F" needs to be placed to show the difference.
The image quality meter should be placed in a relatively uniform area of the workpiece. If there are special requirements, it should be carried out according to the standards adopted. 6 Determination of image quality
With film radiographic inspection, when determining the image quality, the viewing conditions should meet the requirements of ISO 5580. Recognizable on the image The number of the finest filament is the image quality value. When the image density (or gray scale) is uniform, the continuous gold with a length of not less than 10 mm can be clearly identified. When it is a silk image, the image of the silk is considered to be identifiable. In general, each radiographic test should verify that the image quality meets the requirements by determining the image quality. When translating similar workpieces and areas, the same exposure and processing techniques can be used to ensure and obtain the image quality values. There is no difference, no need to verify the quality of each image, the scope of verification of image quality can be agreed by the parties to the contract. Appendix A
(informative appendix)
ASTME747-04 General Wire Type Marking Guide
The wire diameter equivalent of the wire type image meter described in ASTME747-04 is identical to that listed in Table 1, but the expression is different. Table A.1 gives ASTM A guideline for the comparison of the E747-04 silk type markings with the silk type image quality yarn numbers described in this section. ASTME747-04 for radiographic inspection The consent of the parties is required.
According to the requirements of 4.4, the ASTME747-04 wire type image quality meter used should have a manufacturer number and mark for identification. Table A.1 GB/T 23901.1 silk number and ASTME747-04 universal silk type mark comparison conversion table GB/T 23901.1
Silk number
Corresponding ASTME747-04
Silk group
W2 16
W3 15
W4 14
W5 13
W6 12
W7 11
W12 6
W13 5
W14 4
W15 3
W16 2
W17 1
Group C
Group A
GB/T 23901.1
Silk number
Corresponding ASTME747-04
Silk group
- twenty one
- 20
- 19
- 18
W1 17
W2 16
W7 11
W8 10
W9 9
W10 8
W11 7
W12 6
Group D
Group B
[1] EN462-1.1994 Non-destructivetesting-Imagequalityofradiographs-Part 1.Image Qualityindicators(wiretype)-Determinationofimagequalityvalue
[2] ASTME747-04 Standardpracticefordesign,manufactureandmaterialgroupingclassifi- Cationofwireimagequalityindicators(IQI)usedforradiology

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