Average Exposure to Radiation from Common Sources Source Dose (mrem/year) Naturally Occurring Radiation Cosmic rays Terrestrial radiation (rocks, buildings) Inside human body (K-40 and Ra-266 in the bones) Radon in the air 27 28 39 200 Total 294 Artificial Radiation Medical Xrays Nuclear medicine Consumer products Nuclear power plants All others 39 14 10 0.5 1.5 Total 65.0 Grand total 359 Use the data in the table to decide which is more serious: an accident involving radiation exposure in which a person receives 4.14×104 Sv or the amount of radiation that the average person receives annually from terrestrial radiation (rocks, buildings) . (1 rem = 0.01 Sv)

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