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When mounting BGAs, X-Ray is necessary for inspection of the ball soldering.
But what if I have a BGA on a copper-core PCB?
Are there exisiting inspection systems covering this?
Or would I have to cut out the copper under the area of the BGA?

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X-ray will easily see right through the copper.

This is an X-ray image of a BGA on an 18 layer board that has 6 planes:

BGA X-ray image

As you can see, the solder balls are clearly visible.

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  • \$\begingroup\$ Ok... thank you! Meanwhile I did some research and found a calculator confirming what you say. Before I'd expected the attenuation to be much higher than "almost nothing"... \$\endgroup\$ – mic Mar 10 '16 at 7:45

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