| Code | Meaning |
| ALL | Unknown |
| DXT | DXTRAN track |
| ESP | Energy Split |
| WWS | Weight Window Surface
Split |
| WWC | Weight Window Collision
Split |
| FCU | Forced Coll-n: Uncollided
Part |
| IMP | Importance Split |
| XXN | n from n (x,xn) (n,f) |
| PHN | Photon from Neutron |
| DFL | Double Fluorescence Photon |
| ANI | Annihilation Photon |
| PEE | Photoelectric Electron |
| CMP | Compton Electron |
| PPE | Pair Production Electron |
| AUG | Auger Electron |
| PPP | Pair Production Positron |
| BRM | Bremsstrahlung from
Electron |
| KNK | Knock-on Electron |
| XRE | X-rays from Electron |
| MGPHN | Photon from n (MG) |
| MGNNF | Neutron (n,f) (MG) |
| MGNXN | Neutron (n,xn) (MG) |
| MGPHP | Photon from Photon (MG) |
| MGADJ | Adjoint Weight Split (MG) |