Case b , field and track perpendicular

For the sake of simplification, it is assumed that the particle track is deposited very close to the cathode. The current due to electrons from each track is given as 

Here the total charge is measured because Nq electrons are transferred from the cathode to the anode. If the track would be located at d/2, a factor of 0.5 would appear because of the contribution of the positive ions. 

The detection of individual pulses has the advantage that once the electrons have escaped geminate recombination, no volume recombination has to be taken into account provided the self-conductivity of the liquid is low. The only other effect influencing the electron signal is electron attachment to impurities during their drift to the anode. This effect is characterized by an electron lifetime x during which the number of electrons has decreased to 1/e of its initial value. Each electron which reacts with an impurity and forms a negative ion is lost for the electron current. For the case of a thin layer. Equations 118 and 119 become 

QeiW = eoNo- [l-exp( -ij or with the relative quantities t/tj and Qei(t/td)/eoNo we obtain 

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