Whether the half-life is seconds or thousands of years, radioactive material is deadly to living organisms. Plutonium 239 has a half-life of 24110 years and is one of the most "poisonous" material on earth. Iodine 131 takes 8 days and is deadly as well. While you are right the half-life is not everything, I wouldn't say its exaggeration. When it comes to radioactivity cautious is essential
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