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HTDS Guide > How the Study
Was Conducted > Native Americans and the HTDS
HTDS Guide
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Native Americans and the HTDS
The HTDS research team conducted a feasibility study to determine
whether it would be possible to conduct a study like the HTDS of the
Native American populations that were exposed to Hanford's iodine-131.
Those Tribes and Nations include: Colville, Couer d'Alene, Kalispell,
Kootenai, Nez Perce, Spokane, Umatilla, Warm Springs and Yakama.
A separate feasibility study was conducted because it was recognized
that aspects of the lifestyles of Native Americans differed from
non-Natives, particularly regarding diet, food sources and seasonal
residence changes. All of these factors could have affected the dose
people received.
Eight of the nine tribes provided tribal-specific information for use
in estimating the number of tribal members exposed and the likely
magnitude of their radiation dose to the thyroid. Based on these
estimates, it was determined that a separate study like the HTDS among
Native Americans would not be feasible because it would have too little
chance of detecting any health effects from Hanford's iodine-131.
Nevertheless, Native Americans were included in the HTDS if they were
identified in the group of 5,199 that made up the study cohort.
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