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 P: 58 Hi! I would like some clarification about the straggeling phenomena, why the tip of the curve is pointy ( stiff ) att the topp for 1 particle, but for several particles the top is rounded off. I founf Wikis explanation a little bit dry, or perhaps that is the only way to describe it? http://en.wikipedia.org/wiki/Range_(particle_radiation) " [...] a range may be well defined for that radiation, depending on its energy and charge, as well as the ionisation energy of the stopping medium. Since the nature of such interactions is statistical, the number of collisions required to bring a radiation particle to rest within the medium will vary slightly with each particle, i.e. some may travel further and undergo less collisions than others. Hence, there will be a small variation in the range, known as straggling." Thanks!