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Radiometric techniques in optics characterize the distribution of the radiation's power in space, as opposed to photometric techniques, which characterize the light's interaction with the human eye.
Radiometry is distinct from quantum techniques such as photon counting.
Radioactive dating enables geologists to record the history of the earth and its events, such as the dinosaur era, within what they call the geologic time scale.
Radioactive dating uses the ratios of isotopes and their specific decay products to determine the ages of rocks, fossils and other substances.
any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation. Each paddle is black on one side and silvery on the other.
Radiometers consist of a glass bulb containing a partial vacuum in which four diamond-shaped paddles are mounted on a central axis.
Radiometry is important in astronomy, especially radio astronomy, and plays a significant role in Earth remote sensing.
The measurement techniques categorized as radiometry in optics are called photometry in some astronomical applications, contrary to the optics usage of the term.
The object's approximate age can then be figured out using the known rate of decay of the isotope.