Source:
http://spectrum.ieee.org/energy/the-smarter-grid/sins-of-transmission==================================================================
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BY Alexander Hellemans // October 2005
The view is impressive, if strange. A forest of about two dozen huge towers supports an intricate web of antenna wires that together pump many hundreds of kilowatts into the atmosphere from a site 25 kilometers north of Rome. The antennas are the Vatican's portal to the world: signals from two medium-wave transmitters reach all of Italy at all times, while those from 27 shortwave antennas are beamed at selected parts of the world in different languages at varying times. (Only two of the shortwave antennas transmit at any given time.) Thus, papal speeches, news programs, and religious events are dispatched in 40 languages to all the corners of the world, making this complex as important to the Vatican as the Voice of America and Radio Free Europe were to the United States at the height of the Cold War.
But to the inhabitants of Cesano and neighboring communities, the antennas, some transmitting at an effective 600 kilowatts, represent not only a blight on the landscape and something of a nuisance--hearing the Pope's voice picked up by your front-door intercom is not always appreciated--but also a possible health threat [see photo, "
Radio Spikes"].
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When the antennas were erected in 1951 on a 3.9-square-kilometer plot, the surrounding area, known as Santa Maria di Galeria, was still largely rural. But during the last few decades the area has been built up, and now an estimated 60 000 people live within a radius of 10 km of the transmitters. In 2000, a small number of cases of childhood leukemia, first reported by a local physician, were blamed by residents on the strong radio-frequency fields generated by the Vatican antennas.On the one hand, leukemia incidence was higher close to radio towers; on the other hand, the difference was Statistically Insignificant
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This past May, an Italian court imposed suspended 10-day prison sentences on two Vatican officials responsible for operating the transmitters, a cardinal and a priest, for the "dangerous showering of objects"--meaning the antennas' electromagnetic waves. (The term "electromagnetic radiation" has not made it yet into Italy's legal vocabulary.) In addition, environmental groups and committees representing the local population will be awarded damages in a separate civil action, though the figures have yet to be determined.
Local residents and environmentalists have sought to have the Vatican close down the complex since 2000. Several years ago, an Italian environmental minister, Willer Bordon, organized field strength measurements and found that the Vatican's radio transmitters violated Italy's radiation standards, which are much stricter than those in other parts of the world. He threatened to cut off electric power to the site; in response, Vatican Radio reduced the time it was on the air and transferred some radio transmission to other sites.
The Vatican's situation improved in 2002, when courts ruled that the Italian government had no jurisdiction over the transmitters because of the Vatican's status as an independent state. But in 2003, Italy's Supreme Court overturned those rulings, which resulted in the two Vatican officials' having to stand trial [see photo, "
Divine Right of Way?"]
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Local inhabitants, on the other hand, reacted to the Italian court's finding with jubilation. "We are satisfied; we had to suffer the arrogance of the Vatican for years," one resident told the press. Representatives of Vatican Radio, maintaining that the radiation levels are safe, said that they found the judgment unjust and plan to appeal it.
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RF radiation is nonionizing--that is, it cannot break the bonds in molecules--and no plausible biophysical mechanism has been proposed that would predict biological effects from low-level fields, except as related to heating. Therefore, many scientists in the field have viewed research on the biological effects of radio waves with some skepticism. Radio frequencies do, however, induce currents in parts of the human body, which can resonate as a half-wave antenna: there is a maximum in the fraction of incident energy that is absorbed in the whole body at 100 megahertz and at 800 MHz in the head--the latter is close to the 850 and 900 MHz frequencies used for mobile phones in the United States and Europe. Exposure limits, such as those recommended by the IEEE, take that effect into account.
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So far, however, such studies "do not produce a coherent picture," says Maria Rosaria Scarfi, a researcher at CNR-IREA. Fundamentally, the absence of theoretical models explaining the interaction between electromagnetic fields and biological systems complicates the research, she says.
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