15,000-1950 to 1957 occupational limit per year for adults, including radiation workers and soldiers. Limit changed in 1957 to 5,000 millirems. Occupational limit per year for adult radiation workers, including soldiers exposed to radiation. It is recommended that lifetime cumulative exposure is not to exceed the age multiplied by 1,000 millirems. 500-Occupational limit per year for a minor under 18 exposed to radiation.
Potassium is an essential dietary element that is present mostly in the muscles.
2-Annual exposure due to watching four hours of television every day. 20,000-Therapeutic radioactive iodine treatment of thyroid gland. A localized dose delivers 10,000,000 millirems to the thyroid and about 20,000 millirems to the rest of the body. A radiation dose to kill a cancerous tumor often sends a beam delivering 6,000,000 millirems to the cancerous tissue, but the whole body equivalent dose is much less, as in the thyroid case. The research showed iron supplements are more effective if not be taken with meals.