ELECTRON-EMISSION FROM FOILS INDUCED BY HEAVY-ION COLLISIONS

Absolute double differential yield per ion has been calculated for for ward and backward electron emission produced by collisions of highly c harged uranium ions with carbon foils of varying thicknesses. A Monte Carlo method has been developed which employs multiple ionization of t he carbon and subsequent energy and angular straggling of freed electr ons through the foil. A comparison with experimental double differenti al electron emission yields shows general agreement. Calculated total electron emission is in agreement With experiment at 44 mu g cm(-2) as well as the results of Rothard et al. In addition, the radial distrib ution of energy deposited by the electrons as they pass through the fo il has been calculated. Comparison with the radial dose data of Tobure n et al shows qualitative agreement. The radial dose calculations were also performed for two different cases having the same stopping power (1 MeV/u U23+ and 21 MeV/u U67+) in order to test the supposition tha t the radial dose distribution is inversely related to the square of t he radial distance (Kellerer).