There is an average total dose of radiation received from all three sources by a person residing at sea level, which is approximately .91 mSv per year1. However, a dose twice this size may be received by a person residing at a higher elevation where cosmic rays are more intense. A person living in a geographic region where the radium content of the soil is relatively high can also receive twice the dose of .91 mSv per year. In the latter form is what this paper is going to be concerned with. Radon a chemical element is a heavy, radioactive, noble gas. It is generated by the radioactive dec

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