射线检验程序

equivalent wire sizes for the JB /T7902-1999 IQI are given in Table 1.

像质计体现了射线拍照的质量，所以要采用那种可以保证足够灵敏度（获得要求的像质计指示） 的射线透照方式。胶片上也应显示像质计的标记字母和数字。等同于相应的线型像质计JB/T7902-1999类型，见表1。

6.2.7 FILM IDENTIFICATION底片标记

Each film will be identified by the use of lead symbols to indicate the following minimum information:

每张底片都应当用铅字，至少标明下述信息：工程名称或工件名称，接头编号，接头片子编号，拍片日期，焊工号，材料的厚度或直径。

·The job or workpiece

·The joint

·The section of the joint

·The date of the test

·The welders identification

·The wall thickness or diameter

6.3 TECHNICAL PARAMETERS AND REQUIREMENTS技术参数及要求

6.3.1 GEOMETRIC RELATIONSHIPS几何不清晰度

The geometric unsharpness is calculated as follows:

几何不清晰度应按照下式计算；

Geometric unsharpness UG= fd/S-d

几何不清晰度

Where:

f is the Focal Spot Size or Source Size

f指焦点或源的尺寸

d is the Object to film Distance

d指被检物体至胶片的距离

S is the FFD (X-Ray) or SFD (Gamma Ray)