haikeihōsha
1. background radiation
Noun
#236450
1. background radiation
1. radiation
1. radioactivity
1. radioactive
1. radiation; emission
1. Dear (so and so); Dear Sir
1. background; scenery
2. background (of an incident, situation, etc.); circumstances
3. backing; support (from behind the scenes)
1. Not radiation.; Not radioactive.
1. It is not radiation.; It isn't radiation.
1. With radiation; By radiation