What Types of Radiation Are There? 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.
Fatigue: A condition characterized by a lessened capacity for work and reduced efficiency of accomplishment, usually accompanied by a feeling of weariness and tiredness. Fatigue can be acute and come on suddenly or chronic and persist.
Definition of fatigue for English Language Learners. : 1  the state of being very tired : extreme weariness. 2  fatigues : the uniform that soldiers wear when they are doing physical work. : 3  the tendency of a material (such as metal) to break after being bent or moved many times.