Three Cones (IMAGE)

DOE/Lawrence Berkeley National Laboratory

Three Cones

Caption

How a gamma-ray camera constructs an image: when any three gamma-ray photons are absorbed in a segmented germanium detector, their source can be found by calculating all possible directions, mapped as the surfaces of cones, from which each photon may have arrived. The source γ lies at the point where all three cones intersect.

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Lawrence Berkeley National Laboratory and Lawrence Livermore National Laboratory

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