SGA - Single Gamma Analysis utilizes a single gamma-emitting radioisotope to measure the weight and density of a material. This process involves measuring the single gamma signal attenuation and applying a global calibration to provide the material weight and density.
DGA - Dual Gamma Analysis utilizes two gamma-emitting radioisotopes to measure ash, weight, and density. This process involves measuring the signal attenuation of both radioisotopes individually and using ratios of these signal attenuations to provide ash, weight, and density.
PGNAA - Prompt-Gamma Neutron Activation Analysis utilizes a single neutron-emitting radioisotope to determine the elemental composition of bulk material. The process involves measuring the prompt gamma-ray signature produced when a material is bombarded with neutrons. These neutrons are emitted by a radioactive source (ETI uses CF-252), and a detector senses the gamma rays and converts them to electrical signals for further processing. The gamma-ray energies detected indicate the elements present, and the intensity of the energy is proportional to the amount of the element present.