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The thyroid gland in the neck is one of the few places in the body with a significant concentration of iodine.
To evaluate thyroid activity, a measured dose of I is administered to a patient, and the next day a scanner is used to measure the amount of radioactivity in the thyroid gland.
Radioactive isotopes are effective tracers because their radioactivity is easy to detect.
A is a substance that can be used to follow the pathway of that substance through some structure.
Produce such as tomatoes, mushrooms, sprouts, and berries are irradiated with the emissions from cobalt-60 or cesium-137.Contrary to the belief of some people, irradiation of food Radioactive isotopes have numerous medical applications—diagnosing and treating illness and diseases.One example of a diagnostic application is using radioactive iodine-131 to test for thyroid activity (Figure 15.4 “Medical Diagnostics”).Once a living thing dies, it no longer acquires carbon-14; as time passes the carbon-14 that was in the tissues decays.(The half-life of carbon-14 is 5,370 y.) If a once-living artifact is discovered and analyzed many years after its death and the remaining carbon-14 is compared to the known constant level, an approximate age of the artifact can be determined.