Radioactive materials — if handled improperly — or radiation accidentally released into the environment, can be dangerous because of the harmful effects of certain types of radiation on the body.

如果由于处理不当导致核物质或辐射不慎泄漏到环境中，将会非常危险，因为有些辐射对人体会造成有害影响。

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Nuclear medicine - USES radioactive tracers which can be administered to examine how the body and organs function, for example the kidneys or heart.

核医学-使用放射性示踪剂，可管理，研究如何身体和器官的功能，例如肾脏或心脏。

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Therefore, I view is that the human body with radioactive material should be said that the possibility of harm does not exist.

因此，我的观点是，用放射性物质对人体造成伤害的可能性应该说是不存在的。

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Some medicines,like Prussian blue pills, can help expel radioactive elements from the body.

VOA: special.2011.03.30

One concern raised by such contaminants is that chemically, radioactive and non-radioactivie iodides are too similar for the body to tell apart, thus raising the risk that radioactive iodides can accumulate and lead to further health risks.

FORBES: Researchers Develop Material to Remove Radioactive Contaminants From Drinking Water

Most of the radioactive iodine leaves your body in your urine in the first few days after treatment.

CNN: Thyroid cancer