Radioactivity is atoms breaking down because they are unstable. By doing so, they emit high-energy rays (think invisible bullets) that go through your body and break down important things like your DNA. If you’re lucky you’re okay, if there was enough damage your cells might do things like die, stop multiplicating, or be cancerous (multiply like crazy).
That was if you’re hit by radiation. Now if you ingest radioactive elements, it’s as if you had a machinegun inside your body actively shooting you. Pretty bad.
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