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Radio frequency (RF) has a range of 3kHz to 300GHz corresponds to the frequency of radio waves, and the alternating currents which carry radio signals Radiation protection standard Australian Radiation Protection and Nuclear Safety Agency. Radiating waves or electrical currents, has been used in medical treatments to generate images of the human body. If the human body comes in contact with high power RF currents it can cause superficial but serious burns called RF burns.
Exposure to Microwave at low-power levels below the Specific absorption rate set by government regulatory bodies are considered harmless non-ionizing radiation and have no effect on the human body. However, levels above the Specific absorption rate are considered potentially harmful Mobile phone radiation and health.
A typical microwave oven induces a tissue damaging cooking effect inside the oven at about 2 kV/m. Since radio frequency radiation has both an electric and a magnetic component, it is often convenient to express intensity of radiation field in terms of units specific to each component. The unit volts per meter (V/m) is used for the electric component, and the unit amperes per meter (A/m) is used for the magnetic component.
One can speak of an electromagnetic field, and these units are used to provide information about the levels of electric and magnetic field strength at a measurement location. Power density is measured in terms of power per unit area, for example, milliwatts per square centimeter (mW/cm2). When speaking of frequencies in the microwave range and higher, power density is usually used to express intensity since exposures that might occur would likely be in the far field zone.
Applications in RADAR use relatively high power pulse transmitters and sensitive receivers, so radar is operated on bands not used for other purposes. Most radar bands are in the microwave part of the spectrum, although certain important applications for meteorology make use of powerful transmitters in the UHF band.