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Other RF sources in the community Paging and other communications antennae such as those used by fire police and emergency services operate at similar power levels as cellular base stations and often at a similar frequency In many urban areas television and radio broadcast antennae commonly transmit higher RF levels than do mobile base stations Health effects RF fields penetrate exposed tissues to depths that depend on the frequency - up to a centimetre at the frequencies used by mobile phones RF energy is absorbed in the body and produces heat but the bodys normal thermoregulatory processes carry this heat away All established health effects of RF exposure are clearly related to heating While RF energy can interact with body tissues at levels too low to cause any significant heating no study has shown adverse health effects at exposure levels below international guideline limits Most studies have examined the results of short-term whole body exposure to RF fields at levels far higher than those normally associated with wireless communications With the advent of such devices as walkie-talkies and mobile phones it has become apparent that few studies address the consequences of localised exposures to RF fields to the head WHO has identified research needs to make better health risk assessment and promoted the research to funding agencies Briefly at present time this research indicates oCancer Current scientific evidence indicates that exposure to RF fields such as those emitted by mobile phones and their base stations is unlikely to induce or promote cancers Several studies of animals exposed to RF fields similar to those emitted by mobile phones found no evidence that RF causes or promotes brain cancer While one 1997 study found that RF fields increased the rate at which genetically engineered mice developed lymphoma the health implications of this result is unclear Several studies are underway to confirm this finding and determine any relevance of these results to cancer in human beings Three recent
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