The variance reduction technique for neutron deep penetration?

Biasing
1

i want to do a simulation about neutron deep penetration, which variance reduction technique is good for this case in Fluka? and which cards should be used?

2

Dear @Newconcept_1979,

You might have a look at the Biasing lecture from the last Fluka course. Region importance biasing should be enough for you.
You might also want to turn of the electromagnetic transport, have a look at the manual entry for the EMF card.

3

@ amario, thanks!