During 1955 biophysics researchers under contract with the U.S. Navy reported that in order to prevent deep-tissue burning, radiofrequency radiation exposures should not take place when an exposed individual is wearing or carrying any metal objects such as hair pins, metal implants, buckles, coins, or metal-framed eye glasses, "[a]s any of these objects may concentrate the field and cause burning."
When considering tissue burning the researchers pointed out that radiation can be absorbed deeply and is actually greater in tissue such as muscle or the brain compared to the poorer absorption in the bone and fatty layers near a body surface. They also noted that radiofrequency energy exposure of arterially blocked tissue can result in serious tissue damage and cautioned against exposure of ischemic individuals, those suffering from any such arterial blockages, to radiofrequency radiation.
Even in normal, non-ischemic individuals, the body must compensate for the absorption of radiofrequency radiation through an increase in blood flow to carry away excess energy. However, for a given exposure, the compensation mechanism does not take effect immediately, but occurs over a period of minutes. These researchers reported that maximum increased blood flow, that is maximum compensation, took place only near the end of an exposure. Prior to that time the body was not fully coping, in the thermal sense, with the absorbed radiation. But in any event, they were considering compensation only in the thermal equilibrium context and emphatically indicated that microwave or radiofrequency radiation exposure should be avoided during pregnancy.
... push to build things and make things work, but he also thinks like a physicist about the basic properties of matter and electromagnetic radiation. ...
- BBC World News: "REFUGEES FROM RADIOWAVES" (video report HD)