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During proton therapy, most of the damage is actually done in the last few mm before the beam stops - at the point called the Bragg Peak Yes, the penetration distance is largely determined by the energy above a few MeV; as the particle slows down, it starts to dump more energy per unit length. Quoting from "The physics of protons for patient treatment" (...


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Pu 239 can be put in highly toxic radioactive isotopes. As you know radio isotopes are mostly generated from the radioactive decay reactions and the heaviest material naturally occurring is U238. Pu239 is mostly created in artificial nuclear reactions. The danger of the radio isotopes is measured by their half lives. Radio isotopes having longer half ...



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