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Is Heat From Radiofrequency Exposure Damaging Human Health?
Date:7/5/2011

recommended by the WHO and adopted by the majority of the world's governments, are - in thermal terms - far below temperatures that could harm the body," says Foster. "Indeed, under ordinary environmental conditions, exposure at the whole body limits for the general public, will lead to no detectable increase in core body temperature due to thermoregulatory responses.

That said, both sets of current guidelines on exposure to radiofrequency are subject to limitations, despite the fact that they form the basis for exposure guidelines throughout most of the world.  The IEEE (Institute of Electrical and Electronics Engineers) and the ICNIRP (International Commission on Non-Ionizing Radiation Protection) limits set out basic restrictions in terms of power absorbed in tissue. However, the biologically significant quantity is the thermal exposure (increase in temperature and duration of exposure to elevated temperature).

Within the human body, time-temperature functions for thermal damage to different tissue types varies widely and current limit definitions are complex and difficult to explain to the public. In addition, new technologies employing high-power mm wave sources are coming into use and the possibility of human exposure to such energy at potentially injurious levels is increasing.

"If the limiting hazards of RF energy are indeed thermal, several questions must be addressed," says Mark Dewhirst, Professor of Radiation Oncology, Pathology and Biomedical Engineering at Duke University. "Are current limits adequate to protect diverse tissues from thermal injury?  Would it make sense to move to a time-temperature based limit?  Are present standards adequately protective for exposures to the types of energy employed by modern electronic devices?"

"The workshop and resulting special issue of the International Journal of Hyperthermia addresses these questions and sets out areas wher
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SOURCE International Journal of Hyperthermia
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