I am caunting number of particle that transfer energy to a certain cell more than 100 keV for a detector. I can do it by using number of entering particles to cell and pulse height tally F8 (probability of transferring energy more than 100 keV). 

My problem is, in realistic case, more than one particle can enter to cell at the same time (lets say each energy 70 keV) and they can transfer energy totally more than 100 keV. If i count them one by one (what MCNP do), no signal will be generated. But if i count them together i will get a signal. 

So, is there any way to count them together if many particle belongs to same primary and they enter to detection cell at the same time.

Thank you for your time.

Regards,