RE: ASTM E1165 Measurement of Focal Spots by Pinhole Imaging

X-Ray NDT Forum � Standards for X-Ray NDT � ASTM Standards of E07 � Standards for Focal Spot Measurement for NDT � ASTM E1165 Measurement of Focal Spots by Pinhole Imaging

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#16 | RE: ASTM E1165 Measurement of Focal Spots by Pinhole Imaging datum

Sun May 01, 2022 7:14 pm

I have some for review

#1 looks descent, can easily measure lines and distance between them

#2 faint lines, still able to measure, bottom line is half of the width of top tho, what's that means?

#3 lines are extremely faint, one goes at aslant? Hard to tell

#4 I truly do not know what happened here

#5 lines again are extremely faint/invisible, dark body showed next to focal spot

#6 similar situation as with photo number #4

Extra question:
What exactly are the consequences of using X-Ray tubes with bad focal spots?

reply

#17 | RE: ASTM E1165 Measurement of Focal Spots by Pinhole Imaging datum

Sat Jun 25, 2022 3:49 pm

Welcome in the forum, LoneWanderer.
I am sorry to tell you that I am not an expert of focal spots. In my previous life - when I worked for a leading X-Ray system house - I was a user of focal spots and only in the digital world.
May be here is an expert who knows more about film images of focal spots?

Zitat von LoneWanderer
Extra question:
What exactly are the consequences of using X-Ray tubes with bad focal spots?

The degradation of the focal spot may have several consequences in images. Simplest the dose goes down - you could compensate with longer exposure times (film and CR). Then the focal spot may increase (due to lower dose from the center) which could create unsharper images. The influence of unsharpness in the image is explained here. Sometimes some tungsten from the target spotters on the beryllium window and the focal spot is like a donut - showing some strange ring artifacts in the image. Of course there may be some more consequences ... .
For safety critical applications you should not use tubes with bad focal spots.

Best Regards
Klaus

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