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Backed
backed up
Backer
Backfall
backfield
backfire
backflow
backflowing
Backfriend
backgammon
backgammon board
background
background knowledge
background level
background noise
background processing
-- background radiation --
background retinopathy
background signal
backgrounder
backgrounding
Backhand
backhand drive
backhand shot
backhand stroke
Backhanded
Backhandedness
Backhander
Backheel
backhoe
Backhouse
Backing
backing store

background radiation

Noun1.background radiation - radiation coming from sources other than those being observed
background, background signal

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