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Surveys of environmental 90Sr and 137Cs in fallout , water , soil , food chain ... showed that maximum permissible exposure levels should be reconsidered for ... Ig . Mod .; 62 : 651-64 ( 1969 ) . ... and cumulative ) , broken down by type of work , e.g. , industrial radiography , medical work , and other types . ... Med .; 4 : No. eaeb29290e
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