Some pitchblende contains radium how emits gammas.
On Sat, 11 Apr 2015 09:31:35 +1000, [email protected] wrote: > In reply to Jones Beene's message of Fri, 10 Apr 2015 12:48:35 -0700: > Hi, > [snip] >>which is why even small pitchblende samples make the Geiger >>counter go wild. > > Try putting a sheet of paper between the Geiger counter and the > pitchblende. I > think you will find that it makes a huge difference. Most of the activity > detected is due to alphas emitted from the surface. > > (Got your saw handy? ;) > > Regards, > > Robin van Spaandonk > > http://rvanspaa.freehostia.com/project.html
