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HTDS Guide > Overview
> How the Study Was Conducted
HTDS Guide
How the Study Was Conducted
To study the health effects of Hanford's iodine-131, researchers
investigated a group of people with a wide range of radiation doses to
the thyroid. In this way, researchers could compare groups of people
with similar characteristics (such as lifestyle and diet) but different
levels of exposure.
Participant Selection – Other studies suggest that young
children may be the most susceptible to the effects of radiation on the
thyroid gland. Therefore, the HTDS selected participants who were young
children when Hanford releases of iodine-131 were highest. Scientists
also ensured that the HTDS participants included many people who lived
in areas around Hanford where the highest thyroid radiation doses
occurred.
From a sampling of 5,199 birth records, scientists were able to
locate 3,440 people who were both willing to participate and able to
provide the necessary data for evaluation of thyroid disease.
Data Collection – Participants underwent complete evaluations
for thyroid disease, and provided detailed information about the places
they lived and the quantities and sources of the food and milk they
consumed.
Data Analysis – For each type of thyroid disease, the research
team examined how the rates of disease varied in relation to
participants' estimated radiation doses from Hanford's iodine-131.
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