The primary calculation is how much anode material will be required to protect the structure for the required time.
The better the coating, the less anode material is needed.
The green coke must have sufficiently low metals content in order to be used as anode material.
Lead dioxide is used as anode material in electrochemistry.
Lithium metal is the current choice of anode material for Li-air batteries.
The anode material must be stable to the required high potentials of a few volts and therefore is either platinum or its alloys.
Common anode materials are zinc or lithium.
The X-ray spectrum depends on the anode material and the accelerating voltage.
This value is somewhere in the range 0.4-0.8 W/ m depending on the anode material.
Values in the range 3-6 W/ m have been reported for different anode materials (gallium and tin).