PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
Radiation probe. Scientist using a sodium iodide radiation probe to measure the amount of radiation in a woman's thyroid gland. The probe contains a sodium iodide crystal that creates a pulse of light when radiation interacts with it. The pulse of light is proportional to the amount of radiation present. The thyroid gland produces and secretes hormones that regulate the body's metabolism. The gland requires iodine to produce the hormones. If radioactive iodine is released into the environment it may accumulate in the thyroid gland.
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