M.Sc.

THE ABERRATION CORRECTION DUE TO MISALIGNMENT IN ELECTROSTATIC LENSES

     A computational investigation has been carried out in the field of charged-particle optics. The work is concerned with the design of electrostatic lenses with and without misalignment effect operated under different magnification conditions.The potential field distributions of einzel and immersion electrostatic lenses have been represented by analytic functions. The paraxial ray equation has been solved for the proposed fields to determine the trajectory of the charged particles traversing each lens.

English

Simulation of Buildup Factor for Bremsstrahlung Produced by Complete Absorption of Beta Rays

        The Monte Carlo simulation method has been applied to generate the first data for bremsstrahlung buildup factor (BBUF) produced by the complete absorption of beta particles in different materials. The bremsstrahlung buildup factor was computed by the present method for different thicknesses of water, concrete, aluminum, tin and lead at the maximum bremsstrahlung energy of 2.2 MeV for 90Sr/90Y beta source.

English