By R. L. Heath (auth.), Kurt F. J. Heinrich, Charles S. Barrett, John B. Newkirk, Clayton O. Ruud (eds.)
The software of solid-state detectors of excessive power answer to x-ray spectrometry, and the expanding use of compu ters in either size and information overview, are giving a brand new stimulus to x-ray ideas in analytical chemistry. the 20 th Annual Denver X-ray convention displays this renewed curiosity in different methods. The invited papers, grouped in consultation I, evaluate the charac teristics of the detectors utilized in the dimension of x-rays. One paper is devoted to the detection of unmarried ions. even though any such topic might seem to be marginal to the needs of the Denver convention, we needs to realize the affinity of strategies utilized to comparable reasons. Ion probe mass spectrometry is devoted to projects just like these played via x-ray spectrometry with the electron probe microanalyzer. Scientists and technologists will see those ideas mentioned within the comparable conferences. The dialogue of automation and programming isn't constrained to the 2 invited audio system, yet extends to papers awarded in additional than one consultation. the problem of fluorescence research through isotope- and tube-excitation can also be of serious curiosity to these occupied with the sensible purposes of x-ray concepts. The communications contained during this quantity, and the energetic discussions which regularly the presentation of papers, attest to the energy of the themes that are the fear of the once a year Denver X-ray Conference.
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Extra info for Advances in X-Ray Analysis: Volume 15
A second method in use makes use of the fact that higher-order derivatives of a Gaussian function provide a point of inflection through zero at the midpoint of the peak(12). The method which we have found to be most accurate and versatile for the location of peaks in pulse-height spectra utilizes a cross-correlation technique. (13) This procedure makes use of the fact that the resulting correlation function will indicate a positive correlation where similar functional forms appear in the data. In the case of pulse-height data, the resolution function (Gaussian) is correlated against the spectrum.
Walter, IEEE Trans. on Nucl. 3, 196 (June 1970). DETECTION OF SINGLE IONS BY PULSE COUNTING: APPLICATION TO ION MICROPROBE MASS ANALYZER L. A. Dietz General Electric Company, Knolls Atomic Power Laboratory* Schenectady, New York 12301 ABSTRACT The need to detect low intensity beams of resolved ions with keY energy is encountered frequently in mass spectrometry. It is most readily accomplished by using some form of pulse-counting detector in which ions are allowed to strike a target surface (conversion dynode) where each ion releases a pulse of low energy secondary electrons.
The model has been published by Dietz (10), together with a description of the computer program used for calculations, so only its main features need be outlined here; with it one can predict the probability of occurence of 0, 1, 2, ••• , n secondary electrons/ion impact. The Polys model is based on Taylor series expansions of generating functions. It describes the shape of an output pulse-height distribution of a detector and allows one to estimate detection efficiency for a wide range of pulse-counting detectors.
Advances in X-Ray Analysis: Volume 15 by R. L. Heath (auth.), Kurt F. J. Heinrich, Charles S. Barrett, John B. Newkirk, Clayton O. Ruud (eds.)