방사능 농도가 가장 높은 지역은 어디인가?
About 100,000 Bq/m<sup>3</sup> of radon was found in Stanley Watras's basement in 1984. He and his neighbours in Boyertown, Pennsylvania, United States may hold the record for the most radioactive dwellings in the world. International radiation protection organizations estimate that a committed dose may be calculated by multiplying the equilibrium equivalent concentration (EEC) of radon by a factor of 8 to 9 and the EEC of thoron by a factor of 40 .
Pennsylvania