Which type of radiation does the most tissue damage, but only when the emitter is internally ingested?

Name: Which type of radiation does the most tissue damage, but only when the emitter is internally ingested?
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Question

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Alpha particles are relatively large and heavy, and they ionize more matter in their path, causing more tissue damage. However, they are only dangerous when the emitter is internally ingested (for example, inhaled or ingested) because they cannot penetrate the skin.

Which Type of Radiation Does the Most Tissue Damage, but Only