Table 2. Detected efficiency estimation for the #2 phantom in the incoherent scattering direction.

Internal conversion of nucleus decay	Fluorescence yield for K-shell of Fe	Probability of 6.4 keV photon escaping from 1.1 µm material	Solid angle of APD (sr)	APD efficiency (100 µm Si at 6.4 keV)	Fraction of time window used in APD†
0.89	0.3	0.95	0.21	0.93	0.64

^†Time window 23–120 ns.