Über eine neue Methode zur Messung relativer Häufigkeiten von Isotopen

Mattauch, J.; Ewald, H.

doi:10.1007/bf01621670

Cited by 16 publications

(4 citation statements)

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“…A method of calibration which does not depend on either the time constancy of the ion yield or the validity of the reciprocity law for the emulsion has been reported by Mattauch and Ewald (16) . This method uses a spectrum of an element which has a large number of isotopes with abundances ranging in reasonably spaced steps from low to high values.…”

Section: Photographic Detectionmentioning

confidence: 97%

“…The method presented here for line width correction requires measurement of the width of each line. For this reason it does not require either perfect focusing or knowledge of the theoretical line width, as does the method used by Mattauch and coworkers {15, 16). The trace produced by the strip recorder as the photometer scans a spectrum line does not accurately depict the ion distribution in the beam causing that line, since the photometer response produces a % T trace.…”

Section: Photographic Detectionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Mass Spectrometry of Solids.

Owens¹,

Giardino²

1963

Anal. Chem.

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b Some sources of error in mass spectrometry have been investigated. It is concluded that with the proper development, calibration, and photometry procedures and by applying the appropriate corrections for ion mass and energy, photographic detectors can be used in mass spectroscopy with reasonable accuracy. The large errors that are experienced in solids mass spectrometry probably originate in the spark ion source. A number of processes occur simultaneously in the spark source and contribute in unknown proportions to the total error. This source must be studied further before it can be used for quantitative trace analysis.N THE early 1930's collaboration I between F. W. Aston and the Ilford Co.'s laboratories resulted in the production of the Ilford Q plates. The Q emulsion is made in three types (13): &I, low speed, small grain, and high contrast; Qz, intermediate in speed, grain size, and contrast; and Q, high speed, large grain, and low contrast. Good results have been achieved using the Q1 emulsion for isotope abundance measurements (I@, but the Q2 emulsion, because of its greater speed and intermediate granularity, has been the most widely used emulsion for general analytical mass spectrometry. A recent comparison of several emulsions by Rudloff ($1) indicates that Eastman SWR emulsion may be equal to or better than any of the Ilford Q emulsions. The SWR plates combine the high sensitivity a t low exposures of the &, emulsion with the steeper slope of the calibration curve characteristic of the Q1 emulsion. The work reported in the present paper was done entirely with Ilford Q 2 emulsion. PHOTOGRAPHIC DETECTIONEmulsion and Development Uniformity. The uniformity of photographic response over the total surface of a plate depends on both the uniformity of the emulsion applied to the plates and the ability of the experimenter to develop equally all portions of the emulsion. To minimize the photographic development variations, a mechanical developer (18) was built which provides uniform agitation and good temperature control during a carefully timed photoprocessing procedure.With this equipment, the combined effects of emulsion and development variations were shown to be 5% or less. Since this variation results not only from the nonuniformity of the emulsion but also from errors in making replicate exposures, the nonuniformity of the development process, and errors of densitometry, it is felt that the variation in emulsion uniformity is probably smaller than the total variation, although the possibility of compensating errors must be acknowledged. Thus it appears that emulsion nonuniformity makes only a small contribution to the over-all analytical error.

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Section: Photographic Detectionmentioning

confidence: 97%

Section: Photographic Detectionmentioning

confidence: 99%

Quantitative Mass Spectrometry of Solids.

Owens¹,

Giardino²

1963

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…Historically, the first methods of calibration were graphical. The "many isotope method" uses the measured transmittances of the isotopic lines from elements which have several stable isotopes (e.3_,, Cd, Sn, Os, Hg) plotted(215). A modified "many isotope method" has been developed which increases the number of elements available for the construction of the curve(178).…”

mentioning

confidence: 99%

“…A modified "many isotope method" has been developed which increases the number of elements available for the construction of the curve(178). The Churchill Two-line method uses the transmittance ratios of only two isotopic lines from a single element, but many pairs from different exposures, to construct a preliminary curve(215). The line transmittances of the more abundant isotope are plotted versus the line transmittances of the less abundant isotope.…”

mentioning

confidence: 99%