Sher L D, Kresch E, Schwan H P
Biophys J. 1970 Oct;10(10):970-9. doi: 10.1016/S0006-3495(70)86346-9.
Two mechanisms for the interaction of alternating electrical fields with biological tissue are the development of heat, via i(2)R losses, and field-induced force effects, via differences in passive electrical properties. It has been shown that for continuous wave (CW) fields in media of physiologic electrical conductivity, the development of heat (>1 degrees C) always precedes the possible appearance of a field-induced force effect. Using pearl-chain formation as a model effect and experimentally demonstrating that its time constant varies inversely as the square of the electrical field strength, we show that a pulsed field has no greater ability than a CW field of equal rms field strength to produce a field-induced force effect. Thus, the statement above for CW fields can be broadened to include pulsed fields of any description. By relating incident power density to electric field strength in tissue, we show that the American National Standards Institute's radiation protection guide obviates the production of genetic effects in man, if they exist, via field-induced force effects.
通过i(2)R损耗产生热量，以及通过被动电学性质的差异产生场诱导力效应。研究表明，对于生理电导率介质中的连续波（CW）场，热量的产生（>1摄氏度）总是先于场诱导力效应的可能出现。以珍珠链形成为模型效应，并通过实验证明其时间常数与电场强度的平方成反比，我们表明，与具有相同均方根场强的连续波场相比，脉冲场产生场诱导力效应的能力并不更强。因此，上述关于连续波场的陈述可以扩展到包括任何形式的脉冲场。通过将入射功率密度与组织中的电场强度相关联，我们表明，如果存在通过场诱导力效应在人体中产生遗传效应的情况，美国国家标准学会的辐射防护指南可避免这种情况的发生。
