#8148
vansig
Participant

seems like we want all electrical conductors to be transparent to x-ray, then.

every layer of the onion will be a sandwich, of: a thin semiconductor, that catches a small fraction of x-rays; and two plates of a thicker foil, that carries the current, but is otherwise transparent. there is a maximum thickness, due to skin effect, as well.

if i’m looking at this correctly, then
within each uniformly distributed pulse, upon each layer of the onion, there’d be ~100 nm lateral separation between collisions.

each x-ray absorption imparts an electron with a lot of momentum, like striking a pool cue ball, during the break, causing maybe 10,000 secondary collisions, and lots of electrons rise up about 4 or 5V to the conduction band. the respective plates are thus charged, and we want this current to be collected.

the onion is looking like a big capacitor. the capacitance calculator at http://deepfriedneon.com/tesla_f_calccap.html
gives me ~500 µF, if we choose 1000 of each +ve and -ve plates, with 1mm spacing, assuming average 5317×5317 mm overlap.

unlike an ordinary capacitor, every other layer of insulation is the semiconductor.

will a greater charge than the breakdown voltage develop, from a single pinch?