That would create a blast of energy but those atmospheric processes take order of milliseconds.
It will last on the order of 10^-23 seconds. Nothing long-lived is produced.Īntiproton proton annihilation is a strong interaction. The pions and muons are unstable and decay quickly into stable particles such as electrons. The medium-energy gammas are absorbed in nearby matter. Matter is nearly transparent to the high-energy gammas the downward-emitted ones are absorbed somewhere underground. The neutrinos fly off harmlessly and undetectably into outer space. You get high-energy (~100 MeV) gammas, medium-energy (e.g., 511 keV) gammas, pions, muons, and neutrinos. Matter-antimatter annihilation from a hypothetical macroscopic explosion would produce the same particles as proton-antiproton annihilation in microscopic quantities in accelerator experiments. In practice, although nuclear bombs must produce this kind of artificial transmuation of the surrounding matter (e.g., they do emit neutrons), I think there isn't enough of this kind of process to contribute noticeably to the fallout. In theory, yes, e.g., exposure to neutrons in reactors can be used to intentionally produce radioactive isotopes. Fusion bombs are basically the same idea, because they use fission triggers.Īnd is ionizing radiation capable of radiating materials for a long time ? In a fission bomb, the fallout consists of fission-decay fragments, which are nuclei that can have long enough half-lives to be transported by winds.
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