Watching uranium emit radiation inside a cloud chamber is mesmerizing

Here's a really neat, classic experiment that's always fun to see. When you place uranium inside a cloud chamber, you can see it decay and emit bits of radiation. It's like seeing little alpha particle torpedoes shooting out in every direction, leaving a trail behind.


You can actually do this type of experiment at home too by following these instructions. Below is a video showing nearly an hour's worth of footage.

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and where is one to obtain pure uranium... haha