method and device for the determination of elements in liquid or gasfoermigen materials using example: x-rays roentgenstrahlen uf roentgen rays

摘要

945,730. Irradiation apparatus. CHEMISCHE WERKE HULS A.G. July 30, 1962 [July 31, 1961], No. 29117/62. Heading H5R. [Also in Division G1] A method of quantitatively determining an element in a liquid or gaseous medium comprises irradiating the medium with the characteristic X-ray spectrum of an element excited by α- or #-rays and having an atomic number exceeding that of the element to be determined by at least 2, and measuring the specific absorption in the region of the K- or L-absorption edge of the element to be determined. To determine cobalt in benzene, the mixture is passed through a cell 2. An α- or #-ray emitting preparation 6 in a solid filler 5 is pressed against a copper foil 7 which produces X-rays at 1.53Š and 1.38Š which are in the strong absorption edge of cobalt. The radiation passing through the mixture is received by a NaI-Tl scintillation crystal 8 coupled to a photomultiplier by a light conductor 9, and the output is fed to a single channel pulse height analyser 10 and indicator 11. The detector system may be stabilized against sensitivity variations by measuring the height of the pulses produced and controlling the detector H.T. supply to maintain the pulse height constant. The radioactive source may be HSP3/SP, CSP14/SP, SrSP90/SP or NiSP63/SP for #-rays or RaSP210/SP for α-rays.