Power frequency magnetic fields in the home

The methodology and findings of a domestic magnetic field measurement program are presented. The purpose was to improve understanding of power-frequency magnetic fields in typical domestic locations for exposure assessment applications. Spot measurements were made at ninety-one sites in six states. In addition, twenty-four-hour continuous measurements were made at a few homes. The household magnetic fields are highly variable and exhibit diurnal cycles. Results suggest that the statistical distributions of magnetic field measurements follow a lognormal probability model. Typical mean values of the resultant in most rooms for these data are about 1 mG, with a standard deviation of about twice the mean peak values of 12 mG. Measurements taken during use of appliances are much higher and have resultant means of about 9-20 mG, with standard deviations of about 40-75 mG and some peak values exceeding 1000 mG