Exposure limits for ultra-short wave radiation in work environments.
Exposure limit values for ultra-short wave radiation of humans were derived on the basis of epidemiological survey and experimental exposure of rabbits. Eighteen male rabbits were divided into 4 groups randomly. Three groups were irradiated with ultra-short waves (100 MHz) at 35, 1.5-3.5, and 0.07 mW/cm2 power density in an E-polarized TEM Cell at 24 +/- 4 degrees C ambient temperature. The last group in a sham chamber served as controls. Irradiation was performed 3 hours per day, 5 days per week for 24 weeks. Thermal effects occurred in the group irradiated at 35 mW/cm2. The thermal threshold limit value was set at 1.5 mW/cm2. An epidemiological survey was carried out on 136 factory workers and TV operators exposed over one year to ultra-short wave radiation at 0.2 mW/cm2. They were compared with 108 controls. The only complaint of the exposed group was neurosis. The exposure limit value (ELV) to short wave radiation was set at 0.2 mW/cm2 by using a 15- and 20-fold safety factor.
Zhao
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Department of Occupational Health, Beijing Medical University, China.
Zhang
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Wang
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Yao
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Zho
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Tao
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Tao
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D000818:Animals; D003430:Cross-Sectional Studies; D004784:Environmental Monitoring; D006801:Humans; D008297:Male; D008452:Maximum Allowable Concentration; D009497:Neurotic Disorders / Q000209:etiology; D016273:Occupational Exposure / Q000032:analysis; D011817:Rabbits; D011846:Radio Waves