Hi experts,

I’m curently simulating a plane parrallel ionization chamber geometry filled with air in order to get the gain of the IC. I’m at low field (5000 V/cm) so no multiplication. The gain should then be the total number of electrons created. I shoot protons with E_{kinetic} = 230 MeV across 0.1 cm gap.

Using TrachHeed and taking the mean on 1000 tracks I get **10.4**.

Multiplying the mean energy loss on those 1000 tracks by the mean energy of pair W `track.GetW()`

I get **12.89**.

And using the stoping power S `track.GetStoppingPower()`

and calculating this way Gain = \frac{S~d}{W} I get **12.26**

Shouldn’t those 3 ways give the same result ? Which one is the more realistic ?

Thank you in advance for your help

Kind regards

Pierre