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Above Image: Fission neutrons can be distinguished from background radiation using a novel variation of a metal-organic framework (MOF) scintillator that was a new class of scintillator previously patented by Sandia: Crystals of a metal organic framework (left) emit light in the blue (middle) when exposed to ionizing radiation. Infiltrating them with an organometallic compound causes the crystals to emit red light as well (right), creating a new way to differentiate fission neutrons from background gamma particles. (Sandia National Laboratories Press Release 6/29/12).