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Terrestrial (Earth) Radiation Radiation emitted by Earth is almost entirely long-wave radiation. Most of the terrestrial radiation is absorbed by the water vapor in the atmosphere and some by other gases (about 8 percent is radiated directly to outer space). This radiant energy is reradiated in the atmosphere horizontally and vertically.
The radiation one typically encounters is one of four types: alpha radiation, beta radiation, gamma radiation, and x radiation. Neutron radiation is also encountered in nuclear power plants and high-altitude flight and emitted from some industrial radioactive sources. Alpha Radiation. 2  Alpha radiation is a heavy, very short-range particle and is actually an ejected helium nucleus. 3  Some characteristics of alpha radiation are: 4  Examples of some alpha emitters: radium, radon, uranium, thorium.