Measurement by FIB on the ISS: Two Emissions of Solar Neutrons Detected?

Figure 4

The detection efficiency of the FIB sensor for neutrons as a function of incident energy. The vertical value of 0.02 corresponds to the detection efficiency of 2%. The curve was obtained by the Geant 4 program, taking account of the collision processes of neutrons with the proton or carbon target inside the scintillation fibers. The anticounter trigger condition was also taken into consideration.