129I, a very long lived fission product, persisted in the environment after discharge from the chemical reprocessing plants at Hanford. The significance to human health is evaluated by considering the maximum possible impact it might have. Allowing the total production of 129I to be discharged to the air and considering the location where the maximally exposed individuals residue, the lifetime cumulative thyroid dose is calculated as a function of birth year. The maximally exposed individual at the maximum exposure location was born in 1954 and accumulates a thyroid dose between 1954 and 1995 of slightly over 9,000 microSv (900 mrem) at an average rate of 220 microSv (22 mrem) y-1. Over the same period of time, the soft tissue dose from background radiation due to both external and internal radiation is about 38,000 microSv (3,800 mRem).
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