A radiation detector in a laboratory is being used to measure background radiation. Which row gives the readings and the reason for them?
- Areadings: vary with no pattern; cause: background radiation is random
- Breadings: vary with no pattern; cause: radiation detectors are unstable
- Creadings: slowly increase during the day; cause: background radiation increases as temperature increases
- Dreadings: slowly reduce during the day; cause: background radiation decreases as temperature increases