Lead aprons of ___ mm will reduce the intensity of scattered X -rays over ____ per cent and should be worn by all workers regularly associated with X-ray procedures.
Lead aprons of 0.5 mm will reduce the intensity of scattered X -rays over 90 per cent and should be worn by all workers regularly associated with X-ray procedures.
0.2 and 60
0.3 and 70
0.4 and 80
0.5 and 90
Air, Light, Sound, Housing, Radiation, Waste Disposal