Valid

GB/T 25758.1-2010Non-destructive testing -- Characteristics of focal spots in industrial X-ray systems for use in non-destructive testing -- Part 1: Scanning method (English PDF)

无损检测工业X射线系统焦点特性第1部分：扫描方法

Preview PDF

This is a limited preview

Buy now to download the full PDF (7 pages)

Need quotation for your management?

Get a formal quotation for GB/T 25758.1-2010 in 30 minutes.

Issued by

Standardization Administration of China

Level / Type

National · Recommended

Issue date

December 23, 2010

Implementation date

October 1, 2011

Scope

GB/T 25758.1-2010 is the English-translated version of 无损检测工业X射线系统焦点特性第1部分：扫描方法.

GB/T 25758.1-2010 — 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.

Found what you need?

Document preview — GB/T 25758.1-2010

National Standard of the People's Republic of China

ICS: 19.100
Classification: J 04

Issued by: Standardization Administration of China

Foreword
Introduction
1 Scope
2 Terms and definitions
3.1 Principle and equipment

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.

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.

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

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Cited by

How to Download GB/T 25758.1-2010

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.