hello, everybody, I try to use mcnp to calculate view factor of radiation heat transfer, could somebody give me some advice? I want to use surface source, but I do not know how to get the number of the particles emitted from the source from the output file? and I use F4 tally, I do not know how to use the values of the tally from the output file, the values seem to be very small? Thanks a lot. The attachment is the output file, Hope you can help me .