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A thyroid blocking agent protects the user from:

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Question: A thyroid blocking agent protects the user from

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  1.  An over-active thyroid
  2.  External radiation sources
  3.  Dispersal of radioactive iodine throughout the body
  4.  Concentration of radioactive iodine in the thyroid

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4. Concentration of radioactive iodine in the thyroid

A thyroid blocking agent protects the user from concentration of radioactive iodine in the thyroid.

More information:

A thyroid blocking agent is a pill, typically containing potassium-iodide. The thyroid blocking agent contains non-radioactive iodine which if taken before or immediately after exposure to radioactive iodine, saturates the thyroid with non-radioactive iodine.

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