Sentence examples for natural background from inspiring English sources

The low saturation residual nature of the source zone required correction of tracer breakthrough data for natural background sorption.

They might be just barely detectable above natural background radiation.

This rate is the natural background seismicity for the Midwest.

Billions of years ago, the natural background was stronger.

The fall-out reaching Scandinavia was only twice the natural background level of radiation.

(Neither dose is higher than what the typical American receives from natural background radiation).

Hence, it is uncertain whether any such effects result from natural background radiation.

Driving and walking, however, do seem to be natural "background" actions.

Natural background radiation around the world is about 2.4mSv a year.

According to the Environmental Protection Agency, people receive 0.3 rem per year from natural background radiation.

Natural background exposure for most Americans is about one-third of a rem a year.