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dosimeter a portable instrument that measures amounts of radiation, such as gamma rays or x-rays, to which a person has been exposed.
electromagnetic spectrum the entire range of electromagnetic frequencies from radio, the lowest, to gamma rays, the highest.
radiation sickness sickness induced by overexposure to ionizing radiation such as x-rays or gamma rays, resulting in nausea, diarrhea, bleeding, hair loss, sterility, and often death.
radiopaque of a substance, resistant to penetration by radiation such as x-rays or gamma rays.
rem a unit of radiation exposure, equal to approximately one roentgen of x-rays or gamma rays; roentgen equivalent man.
roentgen a unit of x-radiation or gamma radiation equal to the amount that produces, in 0.001293 gram or one cubic centimeter of dry air at zero degree Celsius and standard atmospheric pressure, one electrostatic unit of electricity.