Thickness offend apron to prevent radiation?: (A) 1 mm, (B) 3 mm, (C) 0.5mm, (D) 7mm
Answer is C. Ans. is 'c' i.e., 0.5 mm o Lead aprons (0.5 mm of lead) will reduce the intensity of scattered X-ray over 90% and should be worn by all workers regularly associated with x-ray procedures.