HVL See Half-value layer. I See Intensity. The energy per unit time that crosses a unit area at right angles to a beam of radiation. The intensity of radiation at any distance from a point source varies inversely with the square of that distance. Any electromagnetic or particulate radiation capable of producing ions, directly or indirectly, in its passage through matter.
Chemical properties are virtually identical for all isotopes of a given element.
The fractional number of photons removed from a beam per unit thickness of material through all absorption and scattering processes. The number of protons and neutrons in the nucleus of an atom. Anyone other than individuals performing assigned duties for the licensee or registrant that involve exposure to sources of radiation. MeV Million electron volts. A submultiple of the common unit of activity, the curie.