MTLE-2100 Structure of Engineering Materials, Questions VI-Answer 1. Lead screens for the protection of personnel in x-ray diffraction laboratories are usually at least 1 mm thick. Calculate the transmission factor, Itrans/Iincident, of such a screen for Cu Ka, Mo Ka, and the shortest wavelengadiation from a tube operated at 30,000 volts. p =11.34 g/cm A oc /p oC X 0.1 Itrans/Lincident Cu Ka 1.54A 233.1 264.3 1.7E-115 Mo Ka 0.711A 122.8 139.3 3.3E-61 ASWL (12400/30KV) 0.413 A33 37.4 5.8E-17 (by extrapolation) 101