The sensitivity of living tissue to microwave field

The fundamental electrical noise of living cells due to thermal and current carrier fluctuations is discussed. It is shown that the levels of thermal and shot noise at the cell's membrane are comparable. The ionic channel opening-closing fluctuations can substantially increase the noise level and add an excess noise. The sensitivity of a typical cell is about of 10/sup -8/ W/m/sup 2/. Numerical modelling of electromagnetic wave propagation in multilayered tissue is used for field level determination inside the body. The radiation density inside the body at a depth of 3-5 cm is 10/sup -5/-10/sup -6/ from this level near the surface at 4500 MHz frequency. Experiments with low-level extremely low frequency amplitude-modulated radiation at 450 MHz frequency are carried out.