How can i cut off transmitted beam particle

Dear Fluka experts

      Is it possible to cut off only primary electrons which are
transmitted through the target, When 15 MeV electron beam is
incident on thin target. I have used EMFCUT card as

EMFCUT -0.0155 1e-5 0.0 43.0
region 43 is after the target.

This card cut the primary as well as secondary electron also positrons.
How can I cut the primary beam particle only (i.e. electron of ~ 15MeV).

      Thank you in advance.
B. J. Patil

Mr. Bhushankumar Jagnnath Patil.
Microtron Accelerator Lab.
Department of Physics,
University of Pune,
Ganeshkhind, Pune 411007
Ph. No. Off. 020-25692678 Ext. 421
Mob. 9823968377
Webpage http://physics.unipune.ernet.in/~bjp
Alternate e-mail amolbhushan_at_gmail.com
Received on Fri Jul 17 2009 - 16:25:16 CEST