natural background

It is 200m long with clear water and natural background.

The colors were simple red and blue on a natural background.

There is no evidence of increased cancer risk at natural background levels(6).

But even that figure would only add about 10 percent to the natural background radiation.

For example, the risk associated with natural background radiation is very small.

On an average the levels are only 10 times greater than the region's natural background radiation.

The testing found that radiation is not present above natural background levels.

The area is known for its relatively high levels of natural background radiation.

Data is required only if product use results in environmental contamination greater than natural background levels.

Therefore, language is influenced by its natural background in a variety of ways.

Include other factors such as the natural background quality, or flow regimes.

And, yes, the natural background at those frequencies, the noise level.

Natural background levels can be detected in soils, air, and water around the world.

It is also the dose rate which arises from natural background levels in several places.

The effects everywhere else would be way below the natural background level that exists anyway.

However, natural background concentrations form the basis for the threshold values.

Some animals' colours and patterns resemble a particular natural background.

This is essentially a natural background flux of water from the lake.

Even natural background levels of ozone exceed the legal limit.

These limits are exclusive of natural background and medical exposures.

The wood and steel design is supposed to blend in with the natural backgrounds.

The ship looked across the entire electromagnetic spectrum and saw nothing but the natural background.

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

EC levels quite low similar to natural background conditions.

The following day, as they set out, the natural background noise of the jungle had turned into an uncomfortable silence.