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Properties of proton beams Figure 1 Protons accelerated to 60% of the speed of light (, km/s, MeV of kinetic energy) by cyclotrons and synchrotrons penetrate approximately 38 cm into the body.

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Description:
of penetration depth in various materials, the ultimate purpose being to estimate the energy deposition or dose rate at a given depth or on the surface of a shielded target such as a man.

Lower energy protons will produce very similar distributions, with the depth of penetration reduced. The radiation penetration of protons or alpha particles from a real isotope will be a combination of many of these curves, all of different energies, smoothing out the shape of the curve.

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