In 1946, Robert Wilson, a physicist at FermiLab near Chicago pointed out that protons with an energy of between 200 and 250 MeV and carbon ions with an energy of 3500 to 4500 MeV work in a different way. Inside the body, they tend to dump all their energy at the end of their range. Not only that, but because the particles are charged, they can be sharply focused. He said that makes these particles ideal for targeting tumours.
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