Annihilation radiation Annihilation radiation Annihilation radiation is a term used in Gamma spectroscopy for the gamma radiation produced when a particle and its antiparticle collide and annihilate. Most commonly, this refers to 511-keV gamma rays produced by a normal (negative) electron colliding with a positron. Annihilation radiation is not monoenergetic, unlike gamma rays produced by radioactive decay. The production mechanism of annihilation radiation introduces Doppler broadening. The annihilation peak produced in a gamma spectrum by annihilation radiation therefore has a higher full width at half maximum (FWHM) than other gamma rays in spectrum. The difference is more apparent with high resolution detectors,
Sort Sol Sort Sol Sort Sol is a pioneer rock band from Copenhagen, Denmark. The band was formed in 1977 as a punk rock outfit, originally under the name Sods (stylized as SODS). The name "Sort Sol" was taken in the early 1980s. It translates to English as "black sun" and is named after a nature phenomenon particular to Denmark, where huge bird flocks gather in the sky and appear to block out the sun. For reasons unknown, the Danish press often refers to their musical style as punk due to their origin, though nearly everything they have put out since 1980