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354: Major Major Major Major
Dear Hank & John
What Is Radioactivity?
Caroline asks how can radiation begin emanating from a piece of clothing after it is exposed to pumpkins and penguins. Can you wash the radioactivity back out of a previously safe object? Or is it part of the atoms now? So, so there are basically two kinds of radiation. There's the kind that's made of photons and so it has no mass, but it has energy. And then there's the kindThat's made of particles that do have mass and energy - photon radiation can be dangerous if it's high energy enough. Whereas radiation that is made of particles because it has mass is going and is going very fast is more dangerous.
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