G:	PHYSICS
G21:	NUCLEAR PHYSICS; NUCLEAR ENGINEERING
G21G:	CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
G21G1/00:	Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes
G21G1/00D:	. Isotope delivery systems use of radioisotopes as tracers G21H5/02
G21G1/00R:	. Recovery of specific isotopes from irradiated targets
G21G1/02:	. in nuclear reactors
G21G1/04:	. outside nuclear reactors or particle accelerators
G21G1/06:	. . by neutron irradiation
G21G1/08:	. . . accompanied by nuclear fission
G21G1/10:	. . by bombardment with electrically charged particles
G21G1/12:	. . by electromagnetic irradiation, e.g. with gamma or X-rays
G21G4/00:	Radioactive sources
G21G4/02:	. Neutron sources
G21G4/04:	. Radioactive sources other than neutron sources
G21G4/06:	. . characterised by constructional features
G21G4/08:	. . . specially adapted for medical application
G21G4/10:	. . with radium emanation
G21G5/00:	Alleged conversion of chemical elements by chemical reaction
G21G7/00:	Conversion of chemical elements not provided for in other groups of this subclass