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More on homely radon.

Routine monitoring at the Limerick nuclear plant near Philadelphia identified a construction worker who had been exposed to high levels of radiation. Subsequent investigation showed that the exposure occurred at home. Levels of naturally occurring radon gas and its radioactive decay products were exposing the worker's family to more than 50 times the annual radiation limit for uranium miners, according to the Nov. 1 MORBIDITY AND MORTALITY WEEKLY REPORT (MMWR). Radon, which emanates from soil, water and rock, often builds up in homes aftering entering through cracks in basement floors (SN:9/18/82, p. 186).

A state survey found that roughly 40 percent of 2,000 homes neighboring the construction worker's also exceed EPA's indoor radon guidelines. An MMWR editorial note by the Atlanta-based Centers for Disease Control noted that the levels in 7 percent of the homes might, after a 10-year exposure, contributed a 3 percent risk of dying from lung cancer.
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Title Annotation:high levels of naturally occurring radiation found in houses
Publication:Science News
Date:Nov 23, 1985
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