Jason answered only when they were in the triple-shielded office where no radiation could penetrate to reveal spoken words.

Since its radiation cannot penetrate the skin, an accidental exposure aboard an airplane is likely to prove insignificant.

Teeth appear lighter because less radiation penetrates them to reach the film.

Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material.

Experts say its use is necessary to obtain the most accurate information about how much radiation from the sun and stars penetrates the human head.

Since some ionizing radiation can penetrate matter, they are used for a variety of measuring methods.

The radiation will penetrate it in a few minutes, and you'll die horribly.

A measure of the depth to which radiation can penetrate the shield is the so-called skin depth.

Ultraviolet radiation from distant objects does not penetrate Earth's atmosphere.

The things's radiation, which no man could outrun, already had penetrated their flesh.