How Geiger Counters work, Geiger Mueller Tubes, DIY and semi-DIY Geiger Counters and how to determine Alpha / Beta / Gamma Radiation.
Heres another good Video on building youre owm Geiger Counter from Tanner Tech;
https://www.youtube.com/watch?v=lRNw5JOoL-w
And heres the cheapest DIY Radiation Detector you can possibly build from Bionerd23 (Its technically a Ion Chamber, not a Geiger Counter..):
https://www.youtube.com/watch?v=cfVBW622Vbs
And heres a great Link that helps alot checking out wich Geiger Tubes to buy:
https://sites.google.com/site/diygeigercounter/gm-tubes-supported
