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absorbed dose appendix H attenuate barrier thickness bearing the radiation Burial Caution signs collimating Concentrations of Radioactive consecutive days container controlled area device dose in excess enter the enclosure Europium exceed Exemptions exposed film badges FLUOROSCOPIC SHOE X-RAY gamma gamma rays gonads health commissioner high radiation area INDUSTRIAL RADIOGRAPHIC INSTALLATIONS Installations APPENDIX ionizing radiation isotope Lanthanum larger thicknesses Lead thickness required limits specified material in excess maximum permissible measured in air Microcuries millirem minimum mr/hr mrem natural uranium occupancy factor occupied-area distance operation patient permissible dose person personnel potentials primary barrier Protection Requirements protective enclosures quantity radiation caution symbol radiation source registered material regulations roentgens Sealed Source secondary SHOE X-RAY MACHINES sign or signs sources of ionizing sources of radiation specified in appendix t-en target-to Technetium Teletherapy Tellurium therapeutic thorium tion tube housing U. S. Department uncontrolled x-ray apparatus x-ray installations Yttrium