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### Mu Ray MP3

Title:Mu-ray "Broken youth"

Duration: 4:51

Quality:320 Kbps

### Artist Info

Gamma ray

A gamma ray or gamma radiation (symbol γ or γ {\displaystyle \gamma } ), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of photons in the highest observed range of photon energy. Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900 while studying radiation emitted by radium. In 1903, Ernest Rutherford named this radiation gamma rays based on their relatively strong penetration of matter; he had previously discovered two less penetrating types of decay radiation, which he named alpha rays and beta rays in ascending order of penetrating power. Gamma rays from radioactive decay are in the energy range from a few keV to ~10 MeV, corresponding to the typical energy levels in nuclei with reasonably long lifetimes. The energy spectrum of gamma rays can be used to identify the decaying radionuclides using gamma spectroscopy. Natural sources of gamma rays originating on Earth are mostly as a result of radioactive decay and secondary radiation from atmospheric interactions with cosmic ray particles. However there are other rare natural sources, such as terrestrial gamma-ray flashes, that produce gamma rays from electron action upon the nucleus. Notable artificial sources of gamma rays include fission, such as occurs in nuclear reactors, as well as high energy physics experiments, such as neutral pion decay and nuclear fusion. Gamma rays and X-rays are both electromagnetic radiation and they have a considerable overlap in the electromagnetic spectrum; so that over a range of energies they cannot be differentiated by detection only. To distinguish them their origin must be known, and in the case of X-rays, the origin is outside the nucleus due to electron interaction. Terminology varies between scientific disciplines, and in astrophysics gamma rays are conventionally defined as having photon energies above 100 keV and are the subject of gamma ray astronomy, whilst radiation below 100 keV is classified as X-rays and is the subject of X-ray astronomy. This convention stems from the early man-made X-rays, which had energies only up to 100 KeV, whereas many gamma rays could go to higher energies. A large fraction of astronomical gamma rays are screened by Earth's atmosphere and must be detected from spacecraft. Gamma rays are ionizing radiation and are thus biologically hazardous. However, despite their high penetration power, for radiation protection purposes they are regarded as less damaging than alpha and beta particles which have greater ionising effect.