Bosons are gluons, W and Z, deuterium nuclei, and other things you should probably type into Wikipedia. They all have integer spin.
Anyhoo, they're working on proton cancer treatments instead of photonic. Seems that protons will stop and radiate most of their energy at a specific point in the body, depending on their initial energy. Photons tend to release most of their energy at the skin, then release the rest evenly on their trip through tissue. Protons release little energy at the skin, and slow down continously until they reach a threshold velocity and then they stop with a burst of energy. I suppose that energy could be considered the latent friction energy a proton needs to move through a mixture of compounds such as flesh.
The issue, of course, is that you need a particle accelerator, which runs a little steep. But it's only a few times more expensive than X-rays, and many insurance providers will cover it if you've got a tumor in a weird spot.
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