Radon class demo

[Joe Provost <provost@mhd1.moorhead.msus.edu>]

Last year a string went out about demonstrations of half life.

One very interesting idea was to use a vacuum cleaner and an air filter
(even tissue/toilet paper) to  capture enough radon progeny to not only
show half-life, but natural
background, counting limitations, etc

I tried this using thick filter paper and after 2 min of filtering I did
not detect any activity over background with a GM counter.

Any ideas?  I am in the upper midwest and this area should have a pretty
high conc of radon gas.


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