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method for determining a korrelverdelingsdiagram of sedimentatievat residing in a dispersion with korrelgrootten smaller than 1 micron by application of a functiecurveschijf,device with a curveschijf and needle for a centrifuge, both applicable in practice.
method for determining a korrelverdelingsdiagram of sedimentatievat residing in a dispersion with korrelgrootten smaller than 1 micron by application of a functiecurveschijf,device with a curveschijf and needle for a centrifuge, both applicable in practice.
1,158,338. Monitoring sedimentation by radiation. EUROPEAN ATOMIC ENERGY COMMUNITY (EURATOM). Oct.10, 1966 [Oct.12, 1965], No.45134/66. Heading G1A. Apparatus for analyzing the sizes of particles dispersed in a fluid, comprising a tank in which the dispersion is contained and the particles subjected to an accelerating force a source of radiation and a radiation detector arranged to receive rays from the source passing through the tank, and means for moving the tank relative to the source and detector parallel to the accelerating force, the rate of relative movement being corelated according to a predetermined programme with the differential distribution of the particles caused by the accelerating force. The diameter of particles whose concentration is measured may be varied linearly or logarithmically with time. The equation of motion of the tank is derived for instances in which sedimentation takes place by gravity or by a centrifuge. The motion may be given to the tank by a rotary or linear cam either directly or via an electric servo, Fig. 5 (not shown). X-rays from a source, Fig.3 pass through apertures in a lead shield 9, filters 19, 20 the sedimentation tube 2 and fall on scintillation detectors 3, 12. The scintillation signals are applied to a recorder 15 which plots the concentration directly. In a modification, Fig.4 (not shown) the difference in scintillation signals moves a wedge in front of detector 12 to balance the signals and the wedge position is recorded. In another modification, Fig. 6 (not shown) one detector is used, the beams being directed on to it alternately. The wedge position may be recorded directly for a gravity sedimented sample or after multiplication by a suitable function for a centrifuged sample.
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