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some 14 million curies of noble gases (~500 PBq) and 14 curies (~500 GBq) of I-131 were released during the course of the accident. About 50,000 curies (~2 PBq) of Kr-85 were vented from the containment and 2 million curies (~75 PBq) of tritium was released.
What people were justifiably freaking out about was iodine with the bio-concentration in the thyroid. Turned out there was very little of it.