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We have used an organic radio-fluorogenic gel to make fixed fluorescent images of the track of an 80MeV proton pencil beam NB this is not a scintillation effect; rather a small fraction of the molecules of the medium are converted permanently from a non-emissive to an emissive form. The spatial resolution of the images is better than 0.1mm and the cuboid form of the gels allows the track to be viewed...
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