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A gamma-ray spectrometer (GRS) is an instrument for measuring the distribution (or spectrum—see figure) of the intensity of gamma radiation versus the energy of each photon. The study and analysis of gamma-ray spectra for scientific and technical use is called gamma spectroscopy , and gamma-ray spectrometers are the instruments which observe ...
Gamma-ray spectrometry, on the other hand, is the method used to acquire a quantitative spectrum measurement. [1] Most radioactive sources produce gamma rays, which are of various energies and intensities. When these emissions are detected and analyzed with a spectroscopy system, a gamma-ray energy spectrum can be produced.
A Radhound Geiger counter measuring radiation emitted by a tree in Chernobyl. Geiger counters are widely used to detect gamma radiation and X-rays, collectively known as photons, and for this the windowless tube is used. However, detection efficiency is low compared to alpha and beta particles.
Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing them. Work by Eugene Feenberg and Henry Primakoff in 1948, Sachio Hayakawa and I.B. Hutchinson in 1952, and, especially, Philip Morrison in 1958 [6] had led scientists to believe that a number of different processes which were occurring in the universe would ...
Hand-held ion chamber survey meter in use to detect gamma radiation. Survey meters in radiation protection are hand-held ionising radiation measurement instruments used to check such as personnel, equipment and the environment for radioactive contamination and ambient radiation.
A gamma ray, also known as gamma radiation (symbol γ), is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei.It consists of the shortest wavelength electromagnetic waves, typically shorter than those of X-rays.
In 2004 H.E.S.S. was the first IACT experiment to spatially resolve a source of cosmic gamma rays. In 2005, it was announced that H.E.S.S. had detected eight new high-energy gamma ray sources, doubling the known number of such sources. As of 2014, more than 90 sources of teraelectronvolt gamma rays were discovered by H.E.S.S. [2]
The gamma that would be emitted after the beta decay is missed, and the γ intensity decreases accordingly: IT = Iγ + Ie− = Iγ(1 + αe), so this phenomenon has to be taken into account in the calculation. Also, the x rays will be contaminated with those coming from the electron conversion process.