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English: The new supplementary ionizing radiation warning symbol launched on 15 February 2007 by the International Atomic Energy Agency (IAEA) and the International Organization for Standardization (ISO). Contains radiating waves, a skull and crossbones and a running person, on a red triangle.
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Beta (β) radiation, consisting of electrons, is halted by an aluminium plate. Gamma (γ) radiation, consisting of energetic photons, is eventually absorbed as it penetrates a dense material. Neutron (n) radiation consists of free neutrons that are blocked by light elements, like hydrogen, which slow and/or capture them.
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Correct radiation warning symbol. Based on specification from . The magenta-on-yellow symbol can be found at Image:radiation warning symbol-US.svg. Created by user:Fibonacci in gedit. This image is highly optimized SVG, and uses less than 1K. For the same symbol with a yellow background, see Image:Radiation warning symbol.svg. Date
Correct US radiation warning symbol. Based on specification from . The black-on-yellow (international) symbol can be found at Radiation warning symbol.svg. The black-on-yellow version is acceptable in the US as well. For a version that is black with no background, see Radiation warning symbol2.svg. Created by myself in Inkscape. Date
English: This diagram demonstrates the constitution of different kinds of ionizing radiation and their ability to penetrate matter. Alpha particles are stopped by a sheet of paper whilst beta particles halt to an Tin foil . Gamma radiation is dampened when it penetrates matter. Gamma rays can be stopped from 4 meters of lead.
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