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background radiation
ionizing radiation that is naturally present in the environment.
background process
(computing, Unix) A process that is not currently able to receive input from its controlling terminal.
background processes
background fodder
A work or medium used (mostly) for the purpose of boosting the enjoyment of another medium.
background music
Any music played in a public space whose main function is to create an atmosphere suitable to a specific occasion, rather than to be listened to.
low-background steel
Used other than figuratively or idiomatically: see low-background, steel. / Steel with low inherent radiation levels, suitable for instruments and experiments highly sensitive to radiation.
low-background lead
Used other than figuratively or idiomatically: see low-background, lead. / Lead with low inherent radiation levels, suitable for instruments and experiments highly sensitive to radiation.
gravitational wave background
gravitational-wave background
cosmic microwave background
(astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the big bang, produced during the epoch of recombination.
