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Types of radiation and the penetrating power through paper, aluminum, lead, and concrete. Alpha, beta, and gamma rays in penetration of materials.
Electron shells of the first ordinary elements of the periodic table. In chemistry and atomic physics, an electron shell may be thought of as an orbit followed by electrons around an atomic nucleus.
International Atomic Energy Agency waving flag with texture background - 3D illustration - 3D render
Atom molecule in female hands on a blue background.

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