The X-ray the PO uses are not powerful enough to kill germs in fertile eggs. They have to be low intensity to avoid wiping out exposed film. When I designed my packing for eggs, I packed the eggs, put the box on the ground, and took a swing at it with an 8 pound sledge, like you would be whacking a big square golf ball. Knocked it about 40 feet end over end. No broken eggs. The secret of shipping eggs is packing. I put 40 in an 81/2 X 11 Flat Rate Box.