background radiation

1. Low-level radiation at the surface of the Earth that comes from cosmic rays and from small amounts of radioactive materials in rocks and the atmosphere.

Example Sentences

Researchers put detectors deep underground to shield them from cosmic rays and background radiation.

From Science Daily

In recent years, the foundation has funded a new observatory in Chile’s Atacama Desert to observe microwave background radiation from the big bang, and created the Flatiron Institute, which applies computational methods to scientific research.

From Science Magazine

The simulation is based on the same astrophysical assumptions about the ultraviolet background radiation produced by the first stars in the Universe, the gas cooling and heating, and the process of star formation.

From Science Daily

It confirmed that the universe wasn’t infinitely old and static but rather had begun as a primordial fireball that left the universe bathed in background radiation.

From New York Times

The result is a Hubble constant closer to the background radiation method, but whether the kilonova method can resolve the Hubble trouble, the researchers do not yet dare to state:

From Science Daily