Abstract:The safety, efficacy and reliability of photon beams is well established; however, new types of beams continue to be introduced and explored with the aim of achieving improved selectivity from better dose distribution or from radiobiological mechanisms. Fast neutrons were the first non-conventional radiation used in cancer therapy. Fast neutrons, a form of high-LET radiation, were introduced for the following radiobiological reasons: (1) a reduction of the OER with increasing LET, (2) a reduction in the differ… Show more
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