If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, the most harmful will be one that emits.

If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, the most harmful will be one that emits.
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If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, ... neutrons C. `beta`-rays D. `alpha`-rays
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