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Potassium Iodide Comments - Need some help

Colleagues —
I'm trying to put the finishing touches on my comments to FDA regarding their new draft guidance document on the use of potassium iodide as a thyroid blocking agentin the event of a radiological emergency. For those of you who were putting off commenting on this little gem, the comment period expires at midnight on Monday, April 30.I
I have repeatedly, over the past few years, called various federal agencies to task when they try to use "data" from Chernobyl to "prove" the relationship between inhaled or ingested radioiodines and thyroid cancer. I sat through a presentation at the National Radiological Emergency Preparedness (REP) Conference in Nashville, TN a couple of weeks ago, in which the FDA representative repeatedly referred to the "irrefutable" nature of the Chernobyl data. The draft guidance document includes the following statement ... "The direct relationship between exposure to inhaled or ingested radioiodines and thyroid cancer risk, if ever in doubt, is firmly established in the aftermath of the 1986 Chernobyl accident. For the reasons discussed above, the Chernobyl data provide the most reliable information available to date on the relationship between internal thyroid radioactive dose and cancer risk. They suggest that the risk of thyroid cancer is inversely related to age, and that, especially in young children, it may accrue at very low levels of radioiodine exposure."
Can anybody cite some hard, factual data that I can use in an attempt to refute this statement?
Thanks in advance for your help!
Jim Hardeman