Analysis of x-ray and other spectra

940,487. Analysis of X-ray and other spectra. T. I. (GROUP SERVICES) Ltd. June 27,1962 [ June 29,1961], No. 23511/61. Heading G1A. In a method of testing material to determine its constituents, the material D, Fig. 3, is bombarded with electrons and the resulting radiation (X, y or infra-red) is det...

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Zusammenfassung:940,487. Analysis of X-ray and other spectra. T. I. (GROUP SERVICES) Ltd. June 27,1962 [ June 29,1961], No. 23511/61. Heading G1A. In a method of testing material to determine its constituents, the material D, Fig. 3, is bombarded with electrons and the resulting radiation (X, y or infra-red) is detected by a proportional counter C whose output is applied through an amplifier A to a pulse height analyser P which sweeps through the amplitude range in half a volt steps and produces a count at each step. To enable reasonable accuracy, the sweep extends over a period of two to four minutes. The resulting signals, which represent the energy spectrum in the fashion shown in Fig. 2 and where the X coordinate is denoted by time, are applied to a ratemeter R the signal from which modulates a carrier signal at M. The final signal is then applied to record on one track of a multi-track magnetic tape recorder TR, the start of movement of the tape being synchronized with the start of sweep in gate P by a signal S. The procedure is then repeated with known pure elements in place of the sample, the elements being those known to be or suspected to be present in the sample. The resulting energy spectrum signals are recorded in similar fashion on further tracks 2-4. The recorded signals are then all played back simultaneously, Fig. 4, and applied through amplifying and detecting channels A', F to control a doublebeam oscilloscope DB. The signal from track 1 corresponding to the sample is applied to the Y-deflection plates of one beam,whilst the signal from tracks 2-4 corresponding to known elements are fed through individual adjustable attenuators V and a combining unit B to the Y-deflection plates of the other beam. The X-plate deflection is synchronized by a signal from the magnetic recorder, the tape in which is formed into a closed loop and run through repeatedly at a rate, say, thirty times greater than the recording rate. The oscilloscope has sufficient persistence to keep the whole of the two traces visible and the three attenuators V are adjusted until the trace from combining unit B matches that due to the sample. From the settings of the control knobs of attenuators V, the proportions of the known elements in the sample may be deduced. In ah alternative arrangement instead of using a double-beam oscilloscope, a single beam tube is employed, the sample signal being applied to one Y-deflection plate, the signal from combining unit B being applied to the other Y-defl