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The absorption of x‐rays by a solid organic phosphor can be enhanced to a great extent by the inclusion of a disperse second solid phase that consists of heavy atoms. In consequence the x‐ray to visible light conversion can be enhanced by one or two orders of magnitude when using composite screens. Experiments on composite anthracene‐ PbCl2 screens reveal an amplification factor of about 30. The experimental results are discussed and are compared with existing theories.

A general introduction is given to the in situ growth of anisotype multiheterojunctions. Structures based on the CdTe-GaTe system are discussed in some detail. Electrical measurements including J-V characteristics and the photovoltaic effect are reported.

Für Phosphore: von geringer Dichte, die aus Atomen mit kleiner Kernladungszahl bestehen , wird die Umwandlung von Röntgen‐ in sichtbares Licht begünstigt, wenn dem Phosphor eine feste dispers verteilte Phase, die aus schweren Atomen besteht, zugesetzt wird.