## A graphic solution for gamma shielding |

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40 millicuries 9 inches absorption by air actual thickness air at 20 Atomic Energy Commission auspices Barrett beam build-up factor calculate California Berkeley California July 24 coefficient of absorption computed density of lead design engineers determine distance between source dose emits gamma photons equation equivalent thickness exceed 6 mr/hr feet foot FORMULA g/Cm gamma intensity rate gamma radiation GAMMA SHIELDING graph graphic solution Health Chemistry inches of lead interpolation intersection of F kEBu lead container lead shielding linear coefficient mixture Monitors and design nuclide requires photon energy photon to total Problem proper units r/hr Radiation Laboratory radionuclides receiver intensity rate second nuclide shield thickness shielding material SOLUTION FOR GAMMA source and receiver specific summation thickness of lead thickness of shielding total disintegrations total distance total radiation true curies U.S. Atomic Energy University of California unknown factor uranium container values of F William G