L0_2016_Athens_Physics_Programme_V6

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Pencil Beam Approximation
 Irradiation field decomposed in thin pencil beams
 Superposition of pencil beam kernels in 2D (much faster since 2D
integration)
 Summation of individual narrow beams
 Pencil beam kernel cannot be modified locally (i.e. for inhomogeneities)
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