GB/T 19348.1-2014 in English

《GB/T 19348.1-2014无损检测 工业射线照相胶片 第1部分：工业射线照相胶片系统的分类》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准化管理委员会。
GB/T19348的本部分的目的是确定胶片系统的性能。
本部分适用于工业射线照相(无损检测)胶片系统与规定的铅增感屏组合的分类。其目的是为了保证射线照相的影像质量(受胶片系统的影响),从而与其他标准如ISO5579、ISO17636和 EN12681的要求相符。
本部分不适用于荧光增感胶片的分类。本部分中胶片系统的测量仅限于一个选定的辐射质量以简化程序。胶片的性能会随着辐射能量而不是胶片系统质量等级而变化。
评定照相处理的其他方法在 GB/T19348.2中有规定,当给出工作条件时,可以通过这些方法来控制胶片系统的性能。

Non-destructive testing - Industrial radiographic film - Part 1: Classification of film systems for industrial radiography
1 Scope
The purpose of this part of GB/T 19348 is to establish the performance of film systems.
This part is applicable for the classification of film systems in combination with specified lead screens for industrial radiography (non-destructive testing). This part is intended to ensure that the image quality of radiographs - as far as this is influenced by the film system - is in conformity with the requirements of other standards such as ISO 5579, ISO 17636 and EN 12681.
This part does not apply to the classification of films used with fluorescent intensifying screens. The measurement of film systems in this part is restricted to a selected radiation quality to simplify the procedure. The properties of films will change with radiation energy, but not the ranking of film system quality.
Additional methods for evaluating the photographic process are described in GB/T 19348.2, by which the performance of film systems may be controlled under the conditions given in industry.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 19348.2 Non-destructive testing - Industrial radiographic films - Part 2: Control of film processing by means of reference values
GB/T 27025 General requirements for the competence of testing and calibration laboratories
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
film system
combination of film and film processing which is carried out in accordance with the instructions of the film manufacturer and/or the manufacturer of the processing chemicals
3.2
film gradient
slope of the characteristic curve of a film at a specified optical density D
3.3
granularity
stochastic density fluctuations in the radiograph, superimposed on the image of the object
Note: The limiting values given in this part of GB/T 19348 are related to fixed radiation energies and specified screens.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling and storage
5 Test method
5.1 Preparation
5.2 Measurement of gradient G
5.3 Measurement of granularity σD
5.4 Measurement of ISO speed S
5.5 Other equipment and procedures
6 Limiting values for classification
Bibliography
Table 1 Limiting values for gradient, gradient/noise-ratio and granularity
Table 2 Determination of ISO speed S from dose KS needed for a film density D=2 above D0