| Interaction Codes | |
| Code | Description |
| 200000 + p | Null boundary for particle p |
| 201000 | Photon spectral reflection |
| 202000 | Photon diffuse reflection |
| 203000 | Photon spectral refraction |
| 204000 | Photon diffuse transmission |
| 302000 | Photon created within PMT |
| 303000 | Photon Rayleigh scattering |
| 304000 | Photon (created within PMT) escapes |
| 305000 | Photon bounces (enters and leaves PMT) |