Abstract: The invention contemplates a radiation sensor containing material which w fluoresce upon incidence of radiation to be detected, wherein the sensor comprises an elongate cylindrical and fluorescible collector core with a cladding wall of material that is transparent to the wavelength of radiation to be detected, and wherein at least one detector which is sensitive to the fluorescent radiation is coupled to at least one of the ends of the cylindrical collector.

Abstract: Molded thermoplastic parts with aspherical surfaces are produced with molds whose molding-cavity surfaces are of spherical development and are elastically deformable. The spherical surfaces are so deformed in specific manner by the pressure of the thermoplastic material during the molding process that predetermined aspherical surfaces are produced. Aspherical surfaces of non-rotational symmetry are produced by additional, yieldably mounted auxiliary pistons which are connected to a hydraulic system.

Abstract: The invention contemplates mold tooling adapted for the molding of a variety of thermoplastic parts. The mold comprises two die elements which carry die-insert plugs, and the mutually facing surfaces of these plugs determine the shape of the part to be produced. In order to retain the insert plugs (3, 4) in the die elements (1, 2) in such manner that they can be simply and easily replaced, that surface (7, 8) of an insert plug (3, 4) which faces its supporting die element (1, 2), and that surface (5, 6) of the supporting die element (1, 2) which serves to receive the involved insert plug (3, 4), are developed as polished spherical surfaces of the same radius R.sub.N. Each interchangeable insert plug has a spherical seating surface of the same spherical radius R.sub.N.