title: Holder for uncovered high-activity radionuclide sources of alpha particles and fission fragments.
mesh_terms: D000512:Alpha Particles; D002142:Californium; D004867:Equipment Design; D009680:Nuclear Fission; D009686:Nuclear Physics / Q000295:instrumentation*; D011835:Radiation Protection / Q000295:instrumentation*
chemical_list: D002142:Californium