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Atom model diagram, protons and neutrons, and electrons orbiting in shells
Radon gas radiation detectors testing. Dosimetrist holding a portable gamma radiation dosimeter set on a long tube with sample probe .
Crab Nebula in constellation Taurus. Supernova Core pulsar neutron star. Elements of this image are furnished by NASA.
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vector illustration of up and down quarks in proton and neutron on white background

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