G21H1/00	7	Arrangements for obtaining electrical energy from radioactive sources, e.g. from radioactive isotopes {, nuclear or atomic batteries}	G21H1/00	G21H1/00		214
G21H1/02	8	Cells charged directly by beta radiation	G21H1/02	G21H1/02		144
G21H1/04	8	Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation	G21H1/04	G21H1/04		99
G21H1/06	8	Cells wherein radiation is applied to the junction of different semiconductor materials	G21H1/06	G21H1/06		280
G21H1/08	8	Cells in which radiation ionises a gas in the presence of a junction of two dissimilar metals, i.e. contact potential difference cells	G21H1/08	G21H1/08		14
G21H1/10	8	Cells in which radiation&#160;heats a thermoelectric junction or a thermionic converter	G21H1/10	G21H1/10		64
G21H1/103	9	{Cells provided with thermo-electric generators}	G21H1/10	G21H1/10		226
G21H1/106	9	{Cells provided with thermionic generators}	G21H1/10	G21H1/10		50
G21H1/12	8	Cells using conversion of the radiation into light combined with subsequent photoelectric conversion into electric energy	G21H1/12	G21H1/12		140
G21H3/00	7	Arrangements for direct conversion of radiation energy from radioactive sources into forms of energy other than electric energy, e.g. {into} light {or mechanic energy}	G21H3/00	G21H3/00		85
G21H3/02	8	in which material is excited to luminesce by the radiation (lamps in which a gas filling or screen or coating is excited to luminesce by radioactive material structurally associated with the lamp&#160; H01J65/00)	G21H3/02	G21H3/02		49
G21H5/00	7	Applications of radiation from radioactive sources or arrangements therefor, not otherwise provided for&#160;	G21H5/00	G21H5/00		170
G21H5/02	8	as tracers	G21H5/02	G21H5/02		373
G21H7/00	7	Use of effects of cosmic radiation	G21H7/00	G21H7/00		44
