SplenomegalySpleenWhole-Body IrradiationSplenectomyHepatomegalyUltraviolet RaysDose-Response Relationship, RadiationPrimary MyelofibrosisGamma RaysSplenic NeoplasmsFood IrradiationHypersplenismRadiation Injuries, ExperimentalLymphatic DiseasesSplenic DiseasesRadiation-Protective AgentsRadiation DosageLymphatic IrradiationMurine Acquired Immunodeficiency SyndromeBone Marrow