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  2. Radiation damage - Wikipedia

    en.wikipedia.org/wiki/Radiation_damage

    By causing the materials to become radioactive (mainly by neutron activation, or in presence of high-energy gamma radiation by photodisintegration). By nuclear transmutation of the elements within the material including, for example, the production of Hydrogen and Helium which can in turn alter the mechanical properties of the materials and ...

  3. Gamma ray - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray

    High-energy (from 80 GeV to ~10 TeV) gamma rays arriving from far-distant quasars are used to estimate the extragalactic background light in the universe: The highest-energy rays interact more readily with the background light photons and thus the density of the background light may be estimated by analyzing the incoming gamma ray spectra.

  4. Very-high-energy gamma ray - Wikipedia

    en.wikipedia.org/wiki/Very-high-energy_gamma_ray

    Air showers of elementary particles made by gamma rays can also be distinguished from those produced by cosmic rays by the much greater depth of shower maximum, and the much lower quantity of muons. [7] Very-high-energy gamma rays are too low energy to show the Landau–Pomeranchuk–Migdal effect. Only magnetic fields perpendicular to the path ...

  5. Ultra-high-energy gamma ray - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-energy_gamma_ray

    The ratio of primary cosmic ray hadrons to gamma rays also gives a clue as to the origin of cosmic rays. Although gamma rays could be produced near the source of cosmic rays, they could also be produced by interaction with cosmic microwave background by way of the Greisen–Zatsepin–Kuzmin limit cutoff above 50 EeV. [4] Ultra-high-energy ...

  6. Atomic gardening - Wikipedia

    en.wikipedia.org/wiki/Atomic_gardening

    Gamma gardens were typically five acres (two hectares) in size, and were arranged in a circular pattern with a retractable radiation source in the middle. Plants were usually laid out like slices of a pie, stemming from the central radiation source; this pattern produced a range of radiation doses over the radius from the center.

  7. Neutron star merger - Wikipedia

    en.wikipedia.org/wiki/Neutron_star_merger

    These high-energy gamma ray photons would extinguish life directly, through thermal stress, molecular breakdown, and terminal radiation damage to both plants and animals. Apart from an unlucky hit by a focused beam, any neutron star merger occurring within 10 parsecs of Earth would also result in conclusive human extinction. [34]

  8. Radioactive waste - Wikipedia

    en.wikipedia.org/wiki/Radioactive_waste

    The back-end of the nuclear fuel cycle, mostly spent fuel rods, contains fission products that emit beta and gamma radiation, and actinides that emit alpha particles, such as uranium-234 (half-life 245 thousand years), neptunium-237 (2.144 million years), plutonium-238 (87.7 years) and americium-241 (432 years), and even sometimes some neutron ...

  9. Photodisintegration - Wikipedia

    en.wikipedia.org/wiki/Photodisintegration

    The incoming gamma ray effectively knocks one or more neutrons, protons, or an alpha particle out of the nucleus. [1] The reactions are called (γ,n), (γ,p), and (γ,α). Photodisintegration is endothermic (energy absorbing) for atomic nuclei lighter than iron and sometimes exothermic (energy releasing) for atomic nuclei heavier than iron.