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= Photon Capture =
= Photon Capture =
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[[Image:BCF10,20,98_comp.png]]
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[[Image:BCF10,20,98_comp.png|frame]]
Taking the accepted photon yield in plastic scintillator to be 8000γ/MeV, the following considerations control the total photon capture:
Taking the accepted photon yield in plastic scintillator to be 8000γ/MeV, the following considerations control the total photon capture:
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* taking the energy deposition in plastic (~1 <math>g/cm^3</math>) to saturate at ~2 MeV/cm with 2 cm length of scintillator yields 4 MeV
* taking the energy deposition in plastic (~1 <math>g/cm^3</math>) to saturate at ~2 MeV/cm with 2 cm length of scintillator yields 4 MeV
* The critical angle in multi-clad BCF scintillating fibers is 27.4<sup>o</sup> C resulting in forward capture of 5.6%
* The critical angle in multi-clad BCF scintillating fibers is 27.4<sup>o</sup> C resulting in forward capture of 5.6%
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* BCF-98 optical fiber transmits 83% and 92% for spectra of BCF-10 and BCF-20 respectively (Efficiency curves shown in adjacent figure)
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* Lastly, frequency-dependent efficiencies must be taken into account. Using nominal efficiency specifications, SiPM PDE distribution weighted by scintillator (BCF-10 or BCF-20) emission and BCF-98 transmission spectra is integrated over all wavelengths. These distributions are shown in adjacent figures.