Backscattering of electrons and atomic number

• Higher atomic number ⬆️ ⇒ More number of backscattered electrons ⏫
• Focusing on gathering only the backscattered electrons(rather than secondary electrons) for imaging(to reduce costs and size of equipment)
• How much energy do they posses(?)

How many electrons required to differentiate each pixel (Visibility 👁️)

• 5*σ (5 standard deviation of electron density) to properly differentiate [please cite]
• People at RCA: 10,000 dots per pixel

Cathode Ray Tubes

• HP using electrons to print paper using transparent cathode ray tubes

Electron Scattering

• Scattering within the sample as well scattering in the air

High Voltage Power Source(40 kV ±10%)

• Some ideas
  • Cockroft Voltage Multiplier using diodes and capacitors
  • Van De Graaff Generator combined with smoothening circuits
  • Array of printed battery cells
  • Flyback transformer (Lethal?)
• Stability required: 5-10 parts/million, should be able provide at least 20mA(not sure about this) for at least 5 minutes(time for imaging)
• [GRAPHICS Needed]