All

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 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.768 Radiation D011827 +
    H01.671.768.513 Radiation, Ionizing D011839 +
      H01.671.768.513.055 Alpha Particles D000512 
      H01.671.768.513.115 Background Radiation D001417 
      H01.671.768.513.125 Beta Rays D001610 
      H01.671.768.513.235 Cosmic Radiation D003359 
      H01.671.768.513.400 Gamma Rays D005720 
      H01.671.768.513.918 X-Rays D014965