[Problems of regulation and definition of exposure limits in the national and international fields].
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After a short review of biological effects of non-ionising electromagnetic radiations, their pathological effects are examined, insisting on methods usable to gain informations. Techniques used for field surveys are studied with definition of various irradiation classes. Then protection methods are dealt with, either individual or global, together with medical surveillance.
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The rise in the level of environmental radiation resulting from man's activities has been relatively small in relation to naturally occurring background [corrected] radiation. (One exception to this is microwave radiations.) There are no quantitative data on the effects of low levels of radiation on man, and the possible health consequences remain unclear. The risks of hazardous amounts from x-rays can be minimized by careful use.
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The purpose of this review is to summarize the experience gained thus far on the potential health hazards of electromagnetic radiation. Far less information is available in the medical literature on this kind of radiation than on ionizing radiation, which has been recognized as a health hazard long ago. Increased rates of cancer morbidity and mortality have been noted in populations exposed to ionizing radiation, and international quantitative safety criteria have been established. Electromagnetic radiation (radiofrequency levels between several hundred kilohertz and 300 GHz) is not an infrequent phenomenon. The literature consists mainly of epidemiological studies out of which grew the assumption that this kind of radiation may be carcinogenic. However, only limited data are available on electromagnetic radiation as a potential cancer inducer. A review of the literature does not demonstrate a direct and clear linkage between electromagnetic radiation and the occurrence of malignant tumors, but much more research and clarification are necessary before reaching any conclusions.
Non-ionizing radiation is extensively used in medicine for diagnostic and therapeutic purposes. Health risks from exposure to different sources of non-ionizing radiation are still not well known. High exposure to non-ionizing radiation produces acute effects on sensitive organs, mostly depending on radiation intensity, frequency and exposure duration. Prolonged low-level occupational exposure may also be hazardous. It is therefore necessary for the medical personnel to be aware of their occupational risk and to know how to apply protective measures in order to protect own health as well as that of the patients.
The U.S. Air Force is concerned with the health and safety of personnel working with emitters of nonionizing electromagnetic radiation. Therefore, an understanding of basic mechanisms of interaction of this radiation with biosystems is essential. A nonresonance, nonclassical mechanism exists for interactions with biosystems under low energy (isothermal) field conditions. This mechanism is slow, or delayed, luminescence. Such a mechanism can form the basis for very sensitive biosensors naturally or artificially connected to metabolic and synthetic cellular processes.
Did exposure to non ionising electromagnetic radiation during World War II in the short term have a stimulating effect on the anterior pituitary gland, and in turn on the gonads of both sexes, since the figures obtained appeared to affect the sexes equally? Is it that the long-term effect of microwave radiation on personnel is to cause adenoma and carcinoma? Is this long-term effect similar to the long-term effect of X-rays on infants, children and adolescents? According to Harrison's Principles of Internal Medicine 1980 (page 1710): "X-rays to the head and neck in infancy, childhood or adolescence is associated with a high incidence of thyroid disease later in life. Nodular disease is found to be particularly common on 20% of patients at risk, and may not be apparent until 30 years or more after exposure. One-third of the nodular type are found to be carcinomatous." The effect of non ionising electromagnetic and microwave radiation on those who work in these fields certainly needs much more investigation. What will be the long-term effect of using micro-ovens on the rising generation?
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In a report prepared by an expert committee of the Health Council of the Netherlands, health-based exposure limits for radiofrequency electromagnetic fields in the frequency range 300 Hz-300 GHz are given. The present paper is a summary of the recommendations in the report and of their rationales.