I seek to build a vacuum chamber for shipping radon contamination sensitive samples. The cylinder will have a height of approximately 2 inches, and needs an inner diameter of 10 inches. The plan is to weld stainless steel pipe to a plate on the bottom, and to have a lid bolt on to the pipe with a copper seal. I need to determine what thickness the top and bottom plates need to be to withstand vacuum. What sort of calculations would I need to do to figure this? I figure I need to find the displacement in the center and make sure it is less than some percentage of the thickness?