human thyroid culture and a method for radio iodine uptake

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I would like to learn about the method of measuring radioactive iodine uptake and metabolism ,in details, in human thyroid cell culture. I wand to know the type of iodine and its concentration needed for this method. And the way I can use a Gama-counter to measure the amount of iodine beeing uptaken. how many days should I wait after adding radioactive iodine to the medium and then measure the radioactivity? thanks a lot