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,
The Butterfly Effect The Butterfly Effect The Butterfly Effect is a 2004 American supernatural psychological thriller film written and directed by Eric Bress and J. Mackye Gruber, starring Ashton Kutcher and Amy Smart. The title refers to the butterfly effect, a popular hypothetical situation which illustrates how small initial differences may lead to large unforeseen consequences over time, but this effect is not really used in the film; moreover, the scenario contradicts to this theory: only the consequences over time change which are directly connected to the causes. Kutcher plays 20-year-old college student Evan Treborn, with Amy Smart as his childhood sweetheart Kayleigh