A Study of Extremely Low Frequency-Magnetic Field (ELF-MF) Exposure Levels of Korean Students by Daily Activity Pattern

The objectives of this study was that investigated ELF-MF exposures among the student class(elementary, middle and high school) for 24-hour activity pattern and find out ELF-MF related factors for the exposures. As a result of the evaluations for ELF-MF exposures about the experimental subjects of 87 students, an TWAAM was 1.03mG(TWASUBGM/SUB: 0.59mG). Results for 24-hour ELF-MF exposures according to gender are as follows: female showed that TWASUBAM/SUB and TWASUBGM/SUB were higher than male in 1.49 and 1.14 times respectively. But, there were not statistically significances in individual ELF-MF exposures according to power lines, city types, age, transportation, residential type, residential size and annual incomes. A result of overall ELF-MF exposure levels for the students in all activities was that 93% of the students was exposed bellow 2mG, and 3.45% was exposed to above 4mG. They spent the longest time in sleep at home: This is 465.05 minutes(GM: 450.98 minute). The ELF-MF exposure level was 0.84±2.92mG(GM: 0.30mG). Thus, these results can be used for data of students ELF-MF level and prevent ELF-MF exposure from the living environment sources.