射线检验程序(8)

射线检验程序

S指X射线的FFD，γ射线的SFD

Geometric unsharpness of the radiograph shall not exceed the following:

射线的几何不清晰度不能超过下列要求：

Material材料 Ug几何不清晰度

Inches 最大（英寸） Thickness, Inches厚度（英寸） Maximum,

Under 2 0.020

2 through 3 0.030

Over 3 through 4 0.040

Greater than 4 0.070

Note: Material thickness is the thickness on which the penetrometer is based.

备注：材料厚度指像质计放置位置的材料厚度。

6.3.2 SENSITIVITY 灵敏度

Sensitivity of the radiographs shall comply with AWS D1.1 and Owner´s specification

底片的灵敏度应满足AWS D1.1及业主规格书的要求

6.3.3 FILM DENSITY 底片黑度

Film density will be the following range:

底片黑度应在下列范围内

For X-ray source: 1.8~4.0 X 射线1.8~4.0

For gamma-ray source: 2.0~4.0 伽玛射线 2.0~4.0

6.3.4 散射射线

Wherever necessary 3mm thick lead sheet shall be placed behind the film cassette to prevent scattered radiation from fogging the film. if be needed.

如有必要，应当在胶片暗袋的背面放置3毫米厚的铅板，以减小被散射线对胶片的影响。

6. 4 RADIOGRAPHIC PROCEDURES射线程序