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GB/T 25758.1-2010: Non-destructive testing -- Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing -- Part 1: Scanning method
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Non-destructive testing -- Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing -- Part 1: Scanning method
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GB/T 25758.1-2010
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Basic data | Standard ID | GB/T 25758.1-2010 (GB/T25758.1-2010) | | Description (Translated English) | Non-destructive testing -- Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing -- Part 1: Scanning method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 11,192 | | Date of Issue | 2010-12-23 | | Date of Implementation | 2011-10-01 | | Adopted Standard | EN 12543-1-1999, IDT | | Regulation (derived from) | National Standard Approval Announcement 2010 No.10 (Total No.165) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the methods of measurement tube voltage up to 500kV industrial X -ray focal spot size of the system. This section describes the use of strict collimation receiver to focus more than 0. 1mm of direct mechanical scanning methods. X -ray images with the image quality and resolution depends largely on the characteristics of focus. In particular, the size and two-dimensional intensity distribution. Commercial X -ray tube type (for example, in advertising or trade) characteristics. Appendix A should first consider the maximum given. | GB/T 25758.1-2010: Non-destructive testing -- Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing -- Part 1: Scanning method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
. Non-destructive testing Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing Part 1. Scanning method
ICS 19.100
J04
National Standards of People's Republic of China
Non-destructive testing of industrial X-ray system focus feature
Part 1. Scanning method
systemsforuseinnon-destructivetesting-Part 1. Scanningmethod
Issued on. 2010-12-23
2011-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 25758 "non-destructive testing of industrial X-ray system focus feature" is divided into five parts.
--- Part 1. Scanning method;
--- Part 2. Pinhole camera radiographic method;
--- Part 3. Slit camera radiographic method;
--- Part 4. Edge method;
--- Part 5. Measurement of the effective focal spot size smaller focus and micro focus X-ray tube.
This section GB/T 25758 Part 1.
This section identical with EN12543-1.1999 "Non-destructive testing of industrial X-ray system focus characteristics - Part 1. Scanning method"
(In English).
This section is equivalent translation EN12543-1.1999.
For ease of use, this section made the following editorial changes.
--- "This European standard" be replaced by "this section";
--- Remove the EN standard foreword;
--- With a decimal point "." Instead of a comma as the decimal point "."
Appendix A of this section is an informative annex.
This part of the National NDT Standardization Technical Committee (SAC/TC56) and focal points.
This section is drafted. Haitai Division Inspection Technologies Ltd., Shanghai IAC NDT Technology Co., Ltd., Shanghai Research Institute of Materials,
Shanghai - Friends Industrial Co., Ltd., Shanghai Wei Cheng Banda Detection Technology Co., Ltd., GE Sensing & Inspection Technologies (Shanghai) Co., Ltd., Dan
East Austrian-ray machines Limited, Shandong Institute of Light Industry.
The main drafters of this section. Fan Qin, Li Bo, Zhang YIMING, Jinyu Fei, Zhao, Ding Minghua, Li Yibin, Sunbao Jiang.
Introduction
In order to meet the needs of different focal spot size measured in GB/T 25758.1 ~ 25758.5, the five different methods are described.
Scanning method (GB/T 25758.1) applies constant focal spot size and intensity distribution of the occasion, for example, for calibration and image processing
process.
Radiographic methods (GB/T 25758.2 and GB/T 25758.3) is a conventional technique, in order to verify that the primary purpose for the highest
To 200kV occasions.
When the pinhole camera can not be used and slit edge method (GB/T 25758.4) may be effective, this method is suitable for simple
Occasions.
In order to take into account micro-focus system, GB/T 25758.5 \u200b\u200bproposes a special approach.
Non-destructive testing of industrial X-ray system focus feature
Part 1. Scanning method
1 Scope
This section GB/T 25758 specifies the method for measuring tube voltage up to industrial X-ray systems focus size of 500kV.
This section describes the use of collimated receiver to focus more than 0.1mm for direct mechanical scanning methods.
X-ray image of the image quality and resolution depends largely on the characteristics of focus, in particular, the size and two-dimensional intensity distribution.
Commercial X-ray tube type (for example, in advertising or trade) characteristics, should first consider the maximum value given in Appendix A.
2 Terms and definitions
The following terms and definitions apply to this part of the GB/T 25758 of.
2.1
Focus focalspot
X-ray emission from the region to see the measuring device X-ray tube anode.
Test Method 3
3.1 Principle and equipment
This chapter describes the process for obtaining the focus and size distribution of the radiation intensity and performs focus scan. Coarsely pre-collimated X-ray
Central beam tube through one pair of the slit collimator, using a scintillation counter to measure the radiation beam. Forming a collimator size h × h
hole. Width h depending on the size of the focal spot size d should be selected according to the corresponding values \u200b\u200bin Table 1.
Table 1 relationship collimator aperture size and focal spot size d of h
d/mm h
0.1 ~ 0.2 ≤10μm
0.2 ~ 0.3 ≤15μm
0.3 ~ 1.0 ≤20μm
> 1.0 ≤0.025d
Pre-collimator slit collimator and double-ray detector should be used as a whole xy scanning table mounted. Detector input
Signal to be input to the data acquisition device (Figure 1, Figure 2). Data collection should be able to work well synchronized with the xy scanning stage.
Data collected by certain steps were complete line scan (Figure 3). Step depends on the resolution of claims, but should not exceed
0.1mm.
Application of pre-collimator lead to production, including a hole diameter of about 5mm. The thickness depends on the maximum X-ray voltage, it should be to
With a value of at least one per cent level considerably.
Measured by the two collimator slits vertically formed as shown in Figure 4. Each slit and placed face to face with two thicknesses of metal block is L
It is formed at the edge of the metal block with a width of the separator to maintain the spacing h. Thickness L is satisfied.
L > 20 × (a/d) × h (1)
Wherein, a is the distance between the focal point of the collimator surface (source side), d is the size of the focus is to be measured. Because penetrating collimator material,
The minimum thickness of the collimator should be determined by. measuring a signal strength through the aperture obtained in at least 100 times greater than the background noise. Slit
Surface roughness Ra of less than 2μm, flatness and parallelism of less than h/5. The material should be selected piece of metal tungsten or other similar tools
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