MAINT: new Am 241 energy description for fast simulation
MAINT: new Am 241 energy description for fast simulation
jp-barron/Susi_Simulation,jp-barron/Susi_Simulation,SiLab-Bonn/SourceSim,SiLab-Bonn/SourceSim,DavidLP/SourceSim,DavidLP/SourceSim