Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A

Note:
• If the electric field is too small, then the electrons do not acquire enough
energy.
• If the mean free path is too small, then the electrons do not acquire
enough kinetic energy.
• If the mean free path is too short, the electron collides too early with low
energy, gives up its acquired energy in a series of non-ionising collisions.
• If the mean free path is too long, then the electron reaches the anode
before colliding with another molecule.
Charlie Chong/ Fion Zhang
https://en.wikipedia.org/wiki/Townsend_avalanche