Commercial Geiger Tube gas contain: Br2, Neon, Argon.

Following is the producting equipment.

high vacuum is important factor of the process. bromine is the Quenching gas.

If you are interested in making one working geiger tube, one Gas composition scheme could be: Ne:98.4%,Ar2:0.1%, Br2:1.5%

following equitments are help for your lab experiment.