I have only the natural radioactivity of the region to work with."

Potassium-40 is the largest source of natural radioactivity in animals and humans.

In 1904, Nature published a study on the natural radioactivity of different mineral waters.

"Natural radioactivity is also an expression of the weak interaction.

He says the ice will cool the phototubes, making them more sensitive, and also provide an environment free of natural radioactivity.

Any natural radioactivity strong enough to do that would be detectable from Xerxes."

In 1905 Thomson discovered the natural radioactivity of potassium.

Antineutrinos are another kind of antiparticle created by natural radioactivity (β decay).

"What I am doing is to introduce a very gradual acceleration of the natural radioactivity in the Earth's crust.

Shales and clays are responsible for most natural radioactivity, so gamma ray log often is a good indicator of such rocks.

Another advantage of using uranium as the absorber was that the natural radioactivity allowed the calorimeter's sensitivity to be conveniently monitored.

Natural radioactivity is the spontaneous decay of the atoms of certain isotopes into other isotopes.

Substances containing natural radioactivity are known as NORM.

This natural radioactivity became a basis for a mistaken claim of the discovery for element 87 (the next alkali metal after caesium) in 1925.

The scintillator is to be used in a neutrino detection project in Japan that requires material as free from natural radioactivity as possible.

Boron occurs sparsely, probably because bombardment by the subatomic particles produced from natural radioactivity disrupts its nuclei.

The formation evaluation gamma ray log is a record of the variation with depth of the natural radioactivity of earth materials in a wellbore.

In 1911, he had used natural radioactivity, in the form of alpha particles, in the first man-made nuclear transmutation, converting nitrogen nuclei into oxygen.

He said that unrelated seasonal effects, such as temperature variations around the sensitive detectors or changes in levels of natural radioactivity, could still be mimicking the expected signal.

The highest values of natural radioactivity are recorded in the canyon of the Sorocaba River, downstream from the Dam Itupararanga.

On the other hand, radiogenic isotope analysis involves measuring the abundances of decay-products of natural radioactivity, and is used in most long-lived radiometric dating methods.

For two of them, natural radioactivity was observed, and three others are predicted to be radioactive but their decays were never observed, due to extremely long half-life times.

Background radiation due to cosmic rays and natural radioactivity is always present; background radiation may also be due to the presence of radioactive substances in building materials.

In certain locations, natural causes of air pollution among others are forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity.

A log of the natural radioactivity of the formation along the borehole, measured in API, particularly useful for distinguishing between sands and shales in a siliclastic environment.