amount of radiation that human can be exposed to per year
All radiation, even low-level background radiation, can damage exposed parts of the human body. Scientists use the term rem to describe an amount of radiation to which a person is exposed. A millirem is 1/1000th of a rem. Every person living in the United States is exposed to about 360 millirems of radiation per year.or example, if the dose rate is 50 millirems per hour, then a person has been exposed to a total dose of 50 millirems of radiation in one hour. At this same dose rate, the total dose in one-half hour would be 25 millirems.
The maximum permissible exposure for a person under 18 working with radiation is one-tenth the adult limit or not to exceed 500 millirems per year above the 300+ millirems of natural sources, plus medical radiation.5,000 millirems per year level was the federal occupational limit during World War II and until about 1950 for radiation workers and soldiers exposed to radiation. The occupational limit became 15,000 millirems per year around 1950. In 1957, the occupational limit was lowered to a maximum of 5,000 millirems per year.