Thickness of lead apron to prevent radiation -: (A) 1 mm, (B) 3 mm, (C) 0.5mm, (D) 7mm
Answer is C. lead aprons of thickness 0.5mm will reduce the intensity of scattered X rays over 90% and should be worn by all workers regularly exposed to X ray procedures. Radiation protection is the youngest bramch of hygiene and is called radiation hygiene. Parks textbook of preventive and social medicine.K Park. Edition 23.page no: 745