Radioactive Sources [g21g-4/00] *** (producing Neutrons Or Other Subatomic Particles, X- Or Gamma Rays, In Fusion Reactors Dig. 1+, In Nuclear Reactors Dig. 5+; In Accelerators H05h; X-ray Tubes H01j-35/00; Gamma Masers H01s-4/00) Patents (Class 976/DIG403)