. Is this a cause for concern for the pregnant worker? Is there a maximum allowable limit for commercial microwave oven radiation?
The US Food and Drug Administration (FDA) has a regulation on microwave oven leakage. In Title 21 it states that the power density limit from an operating microwave oven “shall not exceed 1 milliwatt per square centimeter at any point 5 centimeters or more from the external surface of the oven, measured prior to acquisition by a purchaser, and, thereafter, 5 milliwatts per square centimeter at any such point.” The power leakage from the microwave oven will be even lower once an individual is a foot (12 inches) or more away from the oven, since the power is inversely proportional to the square of distance. A recently published review paper in Bioelectromagnetics (Volume 24, Supplement 6, Page S174-S186, 2003) on “Radiofrequency Fields and Teratogenesis” indicated in the conclusion of the review that only if the fetal tissue is heated could there be biological effects. The microwave oven leakage would not cause heating of the fetal tissue.
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