## Gamma Ray Shielding for Engineering Reference |

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3b and 3c Aluminum Appendix attenuation Brookhaven National Laboratory centimeter Chart of Nuclides Circular 499,3 ignoring cm cm cm cm‘1 for lead collimated Compton scattering Cowang Avg Cyclotron Data—NBS Circular 499,3 Desired factor distance effect of scattering emitted energy range factor of reduction factor of safety final radiation intensity Gamma Radiation gamma rays gamma-ray shielding horizontally to read HVL curve inside surface inverse square law Isotopes left-hand ordinate limonite concrete limonite or magnetite linear absorption coefficient M.I.T. Laboratory magnetite concrete mass-absorption coefficient Mev Absorber millicuries narrow beam Nuclear Data—NBS Circular Nuclear Science Nuclear Shielding Studies Nuclides or Nuclear Number of HVL’s Penetration of Gamma photoelectric photons Phys point source r/hr required to reduce right-hand ordinate roentgens per hour safely shield Science and Engineering shield is 18.1 shielding computations shielding material spherical geometry standard concrete Table Technical Report thickness of absorber Thickness of HVL total thickness