love those kiddies squealin' in the background

I was totally going to post this a while ago but thought no one would care/understand it/think it was interesting. This one is also REALLY good! http://www.youtube.com/watch?v=dCmcNve191M Right at the end you can actually see a tiny branched ray which I think is indicating a Compton scattering event! wow!

very awesome

For those that may not know, the subatomic particles being emitted by the radioactive sample (most likely alpha particles) streak through the air at a high enough speed to quickly compress the air in front of it. After it passes, the air decompresses rapidly and water vapor is formed. This leaves a visible trail of water vapor, much like the trail left behind a jet as it flies at high speeds.

*geek even

Video added to geek channel (geek called by gold star member pho3n1x)

the ones with curved paths are probably beta particles (low mass/charge ratio)

*promote

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Watch Atoms Decay in Real-time in Cloud Chamber has been added as a related post - related requested by oritteropo on that post.