This would be a cool home project (if I didn't have a curious three year old lurking). These types of fission batteries are common — we've left dozens on the moon still powering the bottom half of the landers from 1969. As long as you don't ingest it, it should be safe. This type of radiation can't penetrate your skin. It has the same risk level as wearing one of these types of watches.
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Some time ago I've published article about homemade cpu's, and today we'll be talking about more complex and dangerous things (especially in spite of recent Fukushima accident) – building nuclear reactor at home, which would be able to generate electricity. And before you will start worrying or being skeptical in advance (see Radioactive boyscout) I will say that everything mentioned in this article is more or less safe (at least, as safe as working with Hydrofluoric acid at home), so I strongly recommend anyone to not try this at home. Also, before thinking of doing something – talk to your lawyer – laws are different country-to-country, and many are already in prison
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