> I wonder how many people own a Geiger-counter. I've only seen one in my
> entire life. It was my dads, which I now have. But they are available.

Could build a KFM- simple nuclear-physics-based short-term integrating
dosimeter.

http://en.wikipedia.org/wiki/Kearny_Fallout_Meter

Probably the cheapest and easiest method for detecting radiation.  Not
very useful at low rates, and since it is integrating, worthless for observing
brief spikes.  Also depends on a solid surface, so you won't be wandering
the woods looking for a lost nuke with it.

Still, it's a marvel of a simple demonstration of nuclear physics.

Mike H.
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