Abstract: A device for folding or rolling up an intraocular lens 1 that is to be implanted into an eye, with a lens receiving compartment 2 that is formed by two swivel-connected lens receiving parts 3, 4, which lens receiving compartment 2 is to be moved from an open position for receiving the lens 1, in which the lens is unfolded, into a closed position for folding or rolling up the lens 1 by swiveling the lens receiving parts 3, 4 relative to each other, and with a holding device which is formed by two holding elements 5, 6, one of which holding elements 5 is attached to one lens receiving part 3 and the other holding element 6 is attached to the other lens receiving part 4.

Abstract: A device for folding or rolling up an intraocular lens 1 that is to be implanted into an eye, with a lens receiving compartment 2 that is formed by two swivel-connected lens receiving parts 3, 4, which lens receiving compartment 2 is to be moved from an open position for receiving the lens 1, in which the lens is unfolded, into a closed position for folding or rolling up the lens 1 by swiveling the lens receiving parts 3, 4 relative to each other, and with a holding device which is formed by two holding elements 5, 6, one of which holding elements 5 is attached to one lens receiving part 3 and the other holding element 6 is attached to the other lens receiving part 4.

Abstract: Stereotactic frame having a ring which, for a radiological treatment in the head area, can be supported under pressure on a patient's skill bone by several posts fastened on the ring. A measuring device is provided on at least one post to measure the material deformation on the post resulting from the pressure.

Abstract: The Alpha Energy Range Discrimination (AERD) method employs first and second proportional counter tubes separated by a foil and an electronic evaluation system, and comprises the following steps:(a) a filter is disposed in the stream of air flow and is thereby covered with dust, no artificial aerosol alpha activity being present;(b) the radiation of natural nuclides is measured by means of the first and second counter tubes in pulses per second, and respective count rates alpha.sub.1 and alpha.sub.2 are determined;(c) the ratio alpha.sub.1 /alpha.sub.2 is plotted graphically against alpha.sub.2 and corresponding constant values a.sub.1 and a.sub.2 are determined for each counter tube in accordance with the least square fit method;(d) the counter tubes are arranged with the second counter tube above the first counter tube, separated by the separating foil, so that the lower counter tube measures the radiation of both natural and artificial nuclides (count rate alpha.sub.

Abstract: A method and apparatus for detecting .alpha.-rays present in a specified energy range includes a chamber in which is located a filter, an .alpha.detector and a measuring space which is kept at less than 40% of normal atmospheric pressure. The reduced measuring space pressure in turn reduces energy loss of the .alpha.-particles as they travel from the filter to the detector, thereby permitting a high degree of differentiability of the .alpha.-particles according to their energy levels while at the same time providing a large enough sample of .alpha.-particles for .alpha.-activity measurement. Sufficient collimation of the .alpha.-rays is effectuated by limiting the linear distance across the detector receiving surface as compared with the distance between the detector and filter receiving surfaces. The collimation is further improved by tapering conically the inside surface of the chamber toward the detector, and by disposing the average aperture angle of the surface elements of the filter between 90.degree.

Abstract: A measuring head 1 which contains in a shielding housing 3 a measuring chamber 5 with a surface barrier-layer detector 9 is provided for measuring the noble gas activity concentration and the aerosol activity concentration. The gas whose activity concentration is to be measured is compressed and introduced into the measuring chamber 5. Due to the pressure increase of the gas, the volume of the measuring chamber 5 and, therefore, the weight of the shielding housing 3 can be reduced.