MCNP PTRAC filters

[MadGander]

Hi all,

I'm modeling an HPGe detector and want to determine the amount of downscatter that contributes to a Ba-133 spectra. I'm using a PTRAC card to filter scattering events that occur in my Ta4C3 shield that contribute to tally 1 (surface fluence across the front face of the detector). I want to further narrow down the events down so that only particles within a certain energy range in tally 1 are considered. In my case, the manual isn't clear whether the E1, E2, ERG entry would correspond to the particle energy at the time of scattering or at the time of tally. Input deck is linked below.

 

[Alex A]

I get no events in the ptrac file when I run that. Is that successful for you?

I don't know ptrac. I would try to do this sort of thing using F8/F6 tallies and PHL. I don't fully understand that either, but you get coincidence and anticoincidence when done right and this can be used to plot, for example a Compton suppressed spectrum.