Average Exposure to Radiation from Common Sources Source Naturally Occurring Radiation. Cosmic rays Terrestrial radiation (rocks, buildings) Inside human body (K-40 and Ra-266 in the bones) Radon in the air Total Artificial Radiation Medical Xrays Nuclear medicine Consumer products Nuclear power plants All others Total Grand total Dose (mrem/year) 27 28 39 200 294 39 14 10 0.5 1.5 65.0 359 Use the data on the table to calculate the percentage of total annual radiation from naturally occuring sources that the average person receives from cosmic rays. percent

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