The exposure group including 24 employees in the high voltage laboratory and in the generator soldering department was compared to a control group consisting of 24 workers. Besides electric and magnetic fields, oil mist and vapor were measured. In addition to conventional lymphocyte cultures, the lymphocytes were also treated with hydroxyurea and caffeine. This treatment inhibits DNA synthesis and DNA repair in vitro, revealing in vivo genotoxic lesions that are repaired during conventional culturing and in this way remaining unconsidered.
short curcuit testing
Exposure duration: several hours
applied potential test
Modulation type: pulsed
Exposure duration: 12 - 25 single pulses
Exposure duration: 2- 5 h/day for several days per week
generator soldering group
three groups of test persons: i) transformer testers working in two high-voltage laboratories A and B ii) generator soldering group working in two high-voltage laboratories A and B ii) control group without EMF exposure
|Rise time||1 µs|
half-value time 50µs
|electric field strength||3 kV/m||-||-||-||control room at plant A|
|electric field strength||700 V/m||-||-||-||control room at plant B|
|electric field strength||15 kV/m||-||-||-||test hall at plant A|
|electric field strength||2.3 kV/m||-||-||-||test hall at plant B|
|magnetic flux density||70 µT||-||-||-||test hall at plant A|
|magnetic flux density||3 µT||-||-||-||test hall at plant B|
An increased number of chromosome aberrations was observed among high voltage laboratory employees in DNA synthesis and DNA repair inhibited cultures compared to the control group, but not in conventional cultured lymphocytes. Further analysis of the inhibited culture data indicated that years of exposure and smoking increased the risk of chromosome aberrations.
No significant difference were found in the lymphocytes of workers in the generator soldering department.