GB/T 19938-2005 无损检测 焊缝射线照相和底片观察条件 像质计推荐型式的使用

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ICS19.100

J04

中华人民共和国国家标准

GB/T19938-2005八SO2504:1973

无损检测焊缝射线照相和底片

观察条件像质计推荐型式的使用

Non-destructivetesting-Radiographyofweldsandviewingconditionsfor

films-Utilizationofrecommendedpatternsofimagequalityindicators

(ISO2504:1973,Radiographyofweldsandviewingconditionsfor

films-Utilizationofrecommendedpatterns

ofimagequalityindicators(I.Q.1.)，IDT)

2005-09-19发布2006-04-01实施

中华人民共和国国家质量监督检验检疫总局发布

中国国家标准化管理委员会

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GB/T19938-2005八SO2504:1973

目次

前言·······，，，，，，·······，，，，，，，·，··，··················································································……

1范围·，····，，，·，，，，，，，，，，，，·，，，，···························，·······，·，··················，······················，····……

2规范性引用文件································································································……

3像质计的位置，·····，··，·························································································……

4像质计灵敏度(像质值)的确定···············……“““““““““‘”“‘””””””’““””””””’“““‘’‘

5可接受的钢的像质值，·，·，····，，，，，，，，，，，，，，·，，，··，·，······················，··，，·····················，·……“‘·““

5.1要求值···。·················，一·，·。，·，，，，，，·，·，，，，，，，，，，，，，，，，，，，，，··，，·········，，，···，··············，，，······……

5.2容限········································，····，·····，，··，，··，·。。·。。··。·。·····，··，，，，，，，，，···，，，，·，···，，，，，，，，一

6射线照相底片观察条件，，，···，·，，··，，，···························，····，·，···············，··…““·‘·“‘·‘，““““‘

6.1引言，，，·，，，，，·。，。，，一一。一·。，。·。··············，，，，，，，，，，，，，，··，·，··，·，，，，，，，············，，，··，···········，，，一

6.2观片灯亮度··············································。。。·······。·。。··。·。。。·······，，，···，，，，，，，·，，，，····，，…

6.3光的颜色··································································，··，····，·，，，。·····一，。，。。。·……

6.4光的漫散射··································································································。·一

6.5亮度的均匀性································································································……

6.6观察时的环境光·························································，，，，。，。·。·。····。····。··。，。。·。·……

6.7暗适应································································································。·····。·。。。一

6.8观察距离······································································································……

6.9观察者的视力································································································……

附录A(规范性附录)阶梯孔型像质计的可见度指数···················································……

表表表图视力表

X射线检测B级(GB/T19943)

铱192伽玛射线检测·········……

钻60伽玛射线检测

表A.1可见度指数N和灵敏度%之间的关系

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GB/T19938-2005/ISO2504:1973

前言

本标准是首次制定

本标准等同采用ISO2504:工973(焊缝射线照相和底片观察条件推荐使用的像质计(IQD型式》