DOSE DISTRIBUTIONS IN TUBING IRRADIATED BY ELECTRON-BEAM - MONTE-CARLO SIMULATION AND MEASUREMENT

A set of nine tube sleeves was prepared by wrapping polyethylene film around a mandrel. Wall thicknesses ranged from a nominal 0.3 to 0.6 cm and diameters ranged from 2 to 5 cm. The sleeves were irradiated with a scanning 3 MeV electron beam and were dose-mapped by indexing and u nwrapping the tube sleeves and measuring the dose by an FTIR spectrosc opic technique. A Monte Carlo simulation model is also described which includes all important elements of 3-D geometry necessary to describe this experiment including window foil and beam scan angle. The simula tion results were compared with the highly detailed dose distribution measurements in the tubing and the differences were found to be genera lly within 3 to 6 percent. Published by Elsevier Science Ltd.