Notsofantastic - Geiger counter is measuring the wrong radiation hazard so it's worthless.
FE years ago took one on flights. It was interesting to see the difference but found out that it wasn't the threat. Matter of fact, we were leaving TAPA(ANU) and all of us were sunburnt.
Prior cancer survivor, long time high flyer, the risk I face is skin cancer from sunburns while younger.