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Some concerns have been raised that these signals might increase the risk of cancer, and research in this area continues. Often neither type of study provides enough evidence on its own, so researchers usually look at both lab-based and human studies when trying to figure out if something causes cancer. The following is a brief summary of some of the major studies that have looked at this issue to date.
However, this is not a comprehensive review of all studies that have been done. Some studies have found possible increased rates of certain types of tumors in lab animals exposed to RF radiation, but overall, the results of these types of studies have not provided clear answers so far. A few studies have reported evidence of biological effects that could be linked to cancer, but this is still an area of research. In large studies published in by the US National Toxicology Program NTP and by the Ramazzini Institute in Italy, researchers exposed groups of lab rats as well as mice, in the case of the NTP study to RF waves over their entire bodies for many hours a day, starting before birth and continuing for at least most of their natural lives.
Both studies found an increased risk of uncommon heart tumors called malignant schwannomas in male rats, but not in female rats nor in male or female mice, in the NTP study. The NTP study also reported possible increased risks of certain types of tumors in the brain and in the adrenal glands. While both of these studies had strengths, they also had limitations that make it hard to know how they might apply to humans being exposed to RF radiation.
Still, the results of these studies do not rule out the possibility that RF radiation might somehow be able to impact human health. Studies of people who may have been exposed to RF radiation at their jobs such as people who work around or with radar equipment, those who service communication antennae, and radio operators have found no clear increase in cancer risk.
This is a false-color image, just like the one of the cat. False-color infrared images of the Earth frequently use a color scheme like the one shown here, where infrared light is mapped to the visible color of red. This means that everything in this image that appears red is giving off or reflecting infrared light.
This makes vegetation like grasa and trees appear to be red. The visible light waves drawn on this picture are green, and the infrared ones are darker red. This is an image of Phoenix, Arizona showing the near infrared data collected by the Landsat 5 satellite. The light areas are areas with high reflectance of near infrared waves. The dark areas show little reflectance. What do you think the black grid lines in the lower right of this image represent?
This image shows the infrared data appearing as red composited with visible light data at the blue and green wavelengths. The amount of thermal radiation emitted by an object depends on its surface temperature, area and characteristics.
Warmer object emits more thermal radiation than cooler one. Handheld infrared ear or forehead thermometers are used to probe body temperatures by detecting the infrared radiation emitted by human bodies.
Infrared cameras are also used for fast screening of travelers with a fever at airports, ports and border crossings. Higher cloud tops are of lower temperature and emit infrared radiation of smaller intensity.
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