| 摘要 |
A luminescent material which is stimulable or excitable through the intermediary of X-rays for the emission of photographically effective light, and which consists of activated lanthanum oxide halogenide. A portion of the lanthanum is replaced by lead and/or thalium in the luminescent material. Thereby, at a reduced afterglow there are obtained crystals with an approximately spherical shape, so that the granularity, as well as the afterglow are reduced.
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