Volume 1, No. 3.

• PLEASE NOTE: There are two distinct areas of the electromagnetic spectrum covered in this publication: 1. The powerline frequency range of 50 or 60 Hertz (cycles per second) which falls in the extremely low frequency (ELF) range of the electromagnetic spectrum, which ranges from 1 to 300 Hz. [Electromagnetic Fields] In this range electric fields are measured in Volts per metre(V/m) and magnetic fields in Amps per metre (A/m).The magnetic portion, referred to as the magnetic flux density is measured in units of either Tesla or Gauss. For fields normally encountered in the environment units are in milli-, micro-, or nanotesla (mT, uT, nT) or if in units of Gauss, in milliGauss.(mG) 2. The radio and microwave frequency range (RF/MW). For radio frequency, this is 100 KiloHertz (KHz) to 30 MegaHertz (MHz). The microwave (MW) range spans from 30 MHz to 300 GigaHertz (GHz). [Electromagnetic Radiation] The usual unit of measurement for this range is for the power density level, expressed in units of watts per square metre ( W/m), milliwatts/cm sq. (mW/cm.sq.), or micro Watts/cm sq.(uW/cm/sq. Another unit is the Specific Absorption Rate (SAR) expressed as Watts/kilogram (W/k), which is the rate at which RF/MW radiation is absorbed in body tissues. The rate of absorption varies with frequency and body size but it is possible to determine approximately what intensity of the power density level produces a certain level of heating in the body.