80 rats were divided into four groups (male and female separately, two sham exposed and two exposed groups). The applied magnetic flux density of 30 µT represents the exposure limit value for the occupational exposure of 20 kHz magnetic fields in Korea (in contrast to the applied magnetic flux density of a previous study (Lee et al. 2006) representing the exposure limit for the general population (6.25 µT)).
Exposure duration: continuous for 8 hr/day, 5 days/week over 18 months
|Exposure duration||continuous for 8 hr/day, 5 days/week over 18 months|
|Additional info||triangular waves|
|magnetic flux density||30 µT||effective value||measured||-||at the center of the top panel|
|magnetic flux density||31.09 µT||effective value||measured||-||+/- 1.16 µT at the top panel|
|magnetic flux density||30.73 µT||effective value||measured||-||+/- 0.46 µT at the bottom panel|
|magnetic flux density||0.11 µT||-||measured||-||60 Hz component|
The data showed that exposure of rats to a 20 kHz intermediate frequency magnetic field with 30 µT flux density for 18 months did not induce any abnormalities in organ weights and did not induce any significant changes in hematological factors, blood biochemistry, urological factors, and histopathological findings. Total tumour incidence was not different between sham-exposed and magnetic field-exposed animals.