Usual

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Possible Answers: NORM.

Last seen on: LA Times Crossword 21 May 2018, Monday

Random information on the term “Usual”:

Common may refer to:

Usual on Wikipedia

Random information on the term “NORM”:

Background radiation is a measure of the ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources.


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Background radiation originates from a variety of sources, both natural and artificial. These include cosmic radiation and environmental radioactivity from such as naturally occurring radioactive materials including radon and radium, and man-made fallout from nuclear weapons testing and nuclear accidents.

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 dose which is already in a location, which is defined here as being “background”, and the dose due to a deliberately introduced and specified source. This is important where radiation measurements are taken of a specified radiation source, where the existing background may affect this measurement. An example would be measurement of radioactive contamination in a gamma radiation background, which could increase the total reading above that expected from the contamination alone.

NORM on Wikipedia