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HTDS Guide

The Hanford Thyroid Disease Study
HTDS Guide > Overview > Findings

HTDS Guide

Overview
About the Hanford Thyroid Disease Study
What Happened at Hanford
How the Study Was Conducted
Findings
Public Involvement and Scientific Review
About Thyroid Disease

Findings

The HTDS data show that the risk of thyroid disease was about the same regardless of the radiation doses people received from Hanford. In other words, no associations between Hanford's iodine-131 and thyroid disease were observed.

> Researchers studied all types of thyroid disease, a disease of the parathyroid glands, and abnormalities of the thyroid gland that can be seen on ultrasound examinations.
> The percentages of people with each kind of thyroid disease or with ultrasound abnormalities were about the same regardless of their estimated radiation dose from Hanford's iodine-131.

The findings do not prove that Hanford radiation had no effect on the health of the area population. However, they show that if there is an increased risk of thyroid disease from exposure to Hanford's iodine-131, it is probably too small to observe using the best epidemiologic methods available.

Thyroid disease was found in the study population. This was expected because thyroid disease is common in other populations, especially among older people and women.

Based on a review of other studies, researchers found that the rates of thyroid disease in the HTDS population were generally consistent with the rates of disease detected in other populations.

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