Radiofrequency Radiation

for the limit values of the simple dispersion that characterizes the frequency dependence. The time constant is
In these equations, C_{m} and G _{m} are capacitance and conductance per square centimeter of the cell membrane; R is the cell radius; is the cellular volume fraction, and _{i} = 1/_{ i} and _{a} = l/ _{a} are the conductivities of the cell interior and suspending medium. The equations apply for smallvolume fractions, , and assume that the radius of the cell is very large compared with the membrane thickness. More elaborate closedform expressions have been developed for cases when these assumptions are no longer valid (Schwan and Morowitz, 1962; Schwan et al., 1970), and an exact representation of the suspension dielectric properties as a sum of two dispersions is available (Pauly and Schwan, 1959). If, as is usually the case, the membrane conductance is sufficiently low, Equations 4.24.5 reduce to the simple forms to the right of the arrows.
Go to Chapter 4.1.2
Return to Table of Contents.
Last modified: June 24, 1997
© October 1986, USAF School of Aerospace Medicine, Aerospace Medical Division (AFSC), Brooks Air Force Base, TX 782355301