mcnp # operator

mnikph

in defining cell you can use '#' but i read some where use this operator slowing your computation but i think mcnp at first chage your code and transform this oprator by use of (':' & ' ') and build new code then start to computation to prevent it , are you know about this subject?

MCNPX

Looks reasonable. You can test your file w/ and w/o '#' to see the difference. The common sense is to design input file containing as simple cell definitions as possible to speed up the computation.