a. The method used for predicting the fluorescence or Cerenkov radiation production shall either:
¾ use a radiation transport calculation that includes Cerenkov and fluorescence physics models and the instrument shielding geometry, or
¾ use a simplified method capable to demonstrate that the level of error in the prediction is within the accepted margins defined for the project.
b. The prediction shall assess the effects of:
1. Direct ionisation of the cathode or dynode of a PMT by a particle, or direct ionisation of the walls of a MCP, in either case producing secondary electrons.
2. Scintillation of optical components of the PMT/MCP.
3. Cerenkov radiation induced in any optical components of the instrument from particles above the Cerenkov threshold.