Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/last-will-of-bga-void.pdf
Krastev of Nordson Dage on the Nordson Dage XD7600NT100 X-ray inspection system before and after thermal cycling. Only those voids found in the BGAs that were above 25% of X- ray image area were chosen for further X-ray analysis. Once a void exceeded this
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