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Possible Answers: NORM.
Last seen on: Irish Times Crosaire Crossword – Dec 2 2017
Random information on the term “NORM”:
Background radiation is the ionizing radiation present in the environment. Background radiation originates from a variety of sources, both natural and artificial. Sources include cosmic radiation, and environmental radioactivity from such as naturally occurring radioactive materials including radon and radium, and fallout from nuclear weapons testing and nuclear accidents.
The term background radiation can have different meanings, depending whether we are considering an ambient radiation dose, or we wish to differentiate between an incidental background and a particular source of radiation of concern.
For example, in considering radiation safety , background radiation is defined by the International Atomic Energy Agency as “Dose or dose rate (or an observed measure related to the dose or dose rate) attributable to all sources other than the one(s) specified. So a distinction is made between sources of dose which are incidentally in a location, which are defined here as being “background”, and the dose due to a specified source. This is important where radiation measurements are taken of a specified radiation source, and the incidental background may affect this measurement. An example would be detection of radioactive contamination in a gamma ray background, which could increase the total reading above that expected from the contamination alone.