noun
a stream of high-energy electrons or positrons emitted by a radioactive substance or generated by a particle accelerator
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Beta rays are a type of ionizing radiation that are produced during the decay of certain radioactive elements.
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I heard that beta rays can penetrate through skin but can be stopped by a thin sheet of aluminum.
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Dude, did you know that beta rays are like the ninja stars of radiation?
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Her words hit me like a beta ray, piercing through my defenses and leaving me vulnerable.