Hypernyms (tenant is a kind of...): bearer; holder (the person who is in possession of a check or note or bond or document of title that is endorsed to him or to whoever holds it) Hyponyms (each of the following is a kind of tenant): cotenant (one of two or more tenants holding title to the same property)
Exposure from terrestrial radiation. The composition of the earth's crust is a major source of natural radiation. The main contributors are natural deposits of uranium, potassium and thorium which, in the process of natural decay, will release small amounts of ionizing radiation.-rays: X-rays are a form of radiation similar to gamma radiation but they are produced mainly by artificial means rather than from radioactive substances. Neutron radiation: Neutron radiation occurs when neutrons are ejected from the nucleus by nuclear fission and other processes.
Background radiationradiation: Energy carried by particles from a radioactive substance, or spreading out from a source. is all around us. Some of it comes from natural sources and some comes from artificial sources. Natural sources of background radiation include: 1  Cosmic rays - radiation that reaches the Earth from space. 2  Rocks and soil - some rocks are radioactive and give off radioactive radon gas.  Living things - plants absorb radioactive materials from the soil and these pass up the food chain.