  In high energy physics experiments, the numerical estimation of primary
ionization is crucial. An advance study on primary ionization can help in
minimizing the effects such as electrical discharges that can damage the
gaseous detectors used in high energy physics experiments. The simulation of
primary ionization of electrons and positrons with the noble gases using the
geant4 toolkit have been presented. The obtained primaries have been separated
from secondaries as the later contribute towards electrical discharges and
further damage the detectors. The xenon gas shows highest primary ionization
among the noble gases.
