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PCE
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CPC Subgroup
G21H 3/02

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 H01J65/00)

Full Title

Arrangements for direct conversion of radiation energy from radioactive sources into forms of energy other than electric energy, e.g. light > 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 H01J65/00)