Glossary
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R
Radio waves
Electromagnetic waves in the radio-frequency (RF) range (usually about 3 to 50 MHz; we also use the term „radio waves“ (RW) although in English language area a wider frequency range is covered by this name) have a wavelength of some metres. Thus, their frequency is lower by a factor of about 100 when compared to the more common microwaves (MW). Due to their interaction with non-conducting, dielectric solids they can also be used for heating these materials. RF heating is advantageous for heating larger volumes in the technical (cubic metre) scale because the characteristic penetration depths are usually much larger than for MW.
Radionuklide
Radionuclides are instable atoms which decay radioactively (see Isotopes).
REDD (Reducing Emissions from Deforestation and forest Degradation)
Reducing Emissions from Deforestation and forest Degradation
Renaturation
Natural habitats are restored to their original condition in the course of renaturation. For example, straightened riverbeds or mining landscapes can be renatured.
Rhizosphäre
The rhizosphere is a region of soil immediately surrounding live roots. A region about 3 mm around the roots is generally designated as the rhizosphere. This region is of special interest from the soil ecological viewpoint, since it is here that soils and plants interact.
