how to build a geiger counter / radiation detector from household materials

READ THIS DESCRIPTION for background information, ie how this device works at all (see links below)! ps: technically, this is NOT a geiger counter. a geiger counter is a special type of ion chamber that runs on very high voltages. the device demonstrated in this video is just a very simple ion chamber. more videos about how ion chambers and radiation detectors in general work: geiger mueller counter (a special type of ion chamber): www.youtube.com scintillation counter (not an ion chamber): www.youtube.com radioactive decay modes; alpha and beta radiation: www.youtube.com radioactive decay modes; gamma radiation: www.youtube.com