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The first gamma ray source to be discovered was the radioactive decay process called gamma decay. In this type of decay, an excited nucleus emits a gamma ray almost immediately upon formation. [note 1] Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium.
The radio and X-ray light increased to a peak 150 days after the merger, [33] [34] diminishing afterwards. [35] Astronomers have monitored the optical afterglow of GW170817 using the Hubble Space Telescope. [36] [37] In March 2020, continued X-ray emission at 5-sigma was observed by the Chandra Observatory 940 days after the merger. [38]
Gamma-ray spectroscopy is the qualitative study of the energy spectra of gamma-ray sources, such as in the nuclear industry, geochemical investigation, and astrophysics. [1] Gamma-ray spectrometry , on the other hand, is the method used to acquire a quantitative spectrum measurement.
Pentecost (also called Whit Sunday, Whitsunday or Whitsun) is a Christian holiday which takes place on the 49th day (50th day when inclusive counting is used) after Easter Day. [1]
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