بررسي شدت ميدان هاي مغناطيسي و الكتريكي اطراف رايانه هاي مورد استفاده و تأثير آن بر سلامت كاربران

Survey on severity of magnetic and electric fields around video display terminals and its association with health effects on operators

Background and aims: Intensity of Magnetic and Electric fields around visual display terminals and its association on health effects were studied. Methods: magnetic and electric fields intensities around 237 VDTs at distances 30j50; 60 cm and different operating conditions (active, screen saver, shut down) with use of HI-3603 device according to Svensk standard method were monitored. Results : magnetic and electric fields Intensities at 30 cm were higher than standard and at 50 cm Monitors in all measurements were lower than standard (20mA/m MPRII, TCO) and (1 V/m, TCO) Magnetic fields intensities of LCD monitors in rare side were higher than all other directions and rise versa intensities of magnetic fields of cathodiC monitors were in front than other sides. Differences of magnetic and electric fields intensities were not significant in various operating conditions (screen saver and active operation). Comparison of chronic syndrome of exhaustion in two groups of case and control, demonstrated higher of prevalence of symptoms such as shedding tears, eye irritation and fatigue in case rather than control group. Conclusion: at time of procurement of monitors TCO standard label should be noticed. During recess times, monitors should be turned off in order to reduce exposure to electric and magnetic fields.