| http://www.w3.org/ns/prov#value | - As an approximation, the thickness of top portion 58 is a function of the accelerating voltage of electron beam 52 and the relationship can be expressed as: R g = 0.046 ??? V a 1.75 d where Rg is the penetration depth in microns, Va is the accelerating voltage or energy in keV, and d is the density of the target material (e.g., layer 16) in g/cm3.
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