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(D) When a radioactive substance is inside the human body,the radiation emitted is absorbed by the surrounding tissues. $\alpha$-particles have the hi

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$\alpha$-particles

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(D) When a radioactive substance is inside the human body,the radiation emitted is absorbed by the surrounding tissues. $\alpha$-particles have the highest ionizing power among the given options. Because they are heavy and carry a $+2$ charge,they cause intense localized damage to biological cells and tissues when emitted internally. Therefore,$\alpha$-emitters are the most harmful when ingested or inhaled.

If by mistake some radioactive substance gets inside the human body,then from the point of view of radiation damage,the most harmful will be the one which emits

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