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.: (A) 0.2 and 60, (B) 0.3 and 70, (C) 0.4 and 80, (D) 0.5 and 90
Answer is D. 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.