[ RadSafe ] Re 30mCi vs 200 mCi I-131 Therapy

[FISHER Spencer -NUCLEAR]

The data for excretion of a 30 mCi or less dose is totally different than that of a 200 mCi dose.  Less than 30 mCi are typically given for hyperthyroidism, in which case the individual still has a functioning thyroid gland.  
Doses of Greater than 70 mCi are typically given for Thyroid Ca, and the patient has had a thyroidectomy, and you are looking to destroy  a little residual tissue and mets.  

And as someone else stated, it is highly variable from individual to individual.

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