| http://www.w3.org/ns/prov#value | - A given entity can be both a signal absorber and a signal generator, i.e., fluorescent or phosphorescent substances can absorb light and emit light; boron absorbs neutrons and emits radiation, and many other such examples; e.g., such as, but not limited to, contrast agents, for example, Gd, Mn or Fe, and electron beam opacifiers such as Pb or Fe;
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