Airborne Radioactivity Area 4
Airborne Radioactivity Area 4 : Radiation and Radiological Disasters. Any area, accessible to individuals, where: - The concentration of airborne radioactivity, above natural background, exceeds or is likely to exceed the derived air concentration (DAC) values listed in appendix A or appendix C of this part; or - An individual present in the area without respiratory protection could receive an intake exceeding 12 DAC-hours in a week
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