Die zionistische Ärzte-Expedition [Illustration] : Metall - Ahmed Pasch - Dornreich - Schalit - Stern - Mahmud Bey - Schwarz

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A LAPLACE TRANSFORM PAIR MODEL TO DETERMINE BREMSSTRAHLUNG SPECTRA FROM ATTENUATION DATA (RADIATION, X-RAY, SPECTRAL MODELING)

Every x-ray attenuation curve inherently contains all the information necessary to extract the complete energy spectrum of a beam. To date, attempts to obtain accurate spectral information from attenuation data have been inadequate.^ This investigation presents a mathematical pair model, grounded in physical reality by the Laplace Transformation, to describe the attenuation of a photon beam and the corresponding bremsstrahlung spectral distribution. In addition the Laplace model has been mathematically extended to include characteristic radiation in a physically meaningful way. A method to determine the fraction of characteristic radiation in any diagnostic x-ray beam was introduced for use with the extended model.^ This work has examined the reconstructive capability of the Laplace pair model for a photon beam range of from 50 kVp to 25 MV, using both theoretical and experimental methods.^ In the diagnostic region, excellent agreement between a wide variety of experimental spectra and those reconstructed with the Laplace model was obtained when the atomic composition of the attenuators was accurately known. The model successfully reproduced a 2 MV spectrum but demonstrated difficulty in accurately reconstructing orthovoltage and 6 MV spectra. The 25 MV spectrum was successfully reconstructed although poor agreement with the spectrum obtained by Levy was found.^ The analysis of errors, performed with diagnostic energy data, demonstrated the relative insensitivity of the model to typical experimental errors and confirmed that the model can be successfully used to theoretically derive accurate spectral information from experimental attenuation data. ^

Aus der Rede des Präsidenten Rektor Dr. A. Schwarz

A. Schwarz

Dr. Ignaz Schwarz : (incl. Verzeichnis seiner Veröffentlichungen in den jüdischen Wissenschaften)

Bernhard Wachstein

Dr. Ignaz Schwarz [Illustration] : (Porträtfoto)

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Rektor Professor Dr. Adolf Schwarz : Anläßlich seines 80. Geburtstages, 15. Juli 1926

Samuel Krauss

Dr. Eduard Schwarz [Illustration] : (Porträtzeichnung)

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Die Aschkenasische Synagoge in Jerusalem [Illustration] : Aus: Schwarz "Descriptive History of Palestine" 1850

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Ein Freitagabend mit Josef Schwarz

Heinrich York-Steiner

Opernsänger Josef Schwarz [Illustration] : geb. 1881 in Riga, gest. 1926 in Berlin

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Aus einem Schreiben des Hrn. Joseph Schwarz aus Jerusalem, an seinen Bruder, Hrn. H. Schwarz, Rabbiner in Hürben

Josef Schwarz

Fortsetzung eines Schreibens des Herrn Joseph Schwarz aus Jerusalem an seinen Bruder, Hrn. H. Schwarz, Rabbiner in Hürben

Josef Schwarz

Der unschätzbare Zaun, der Schwarz-Wallnussbaum und Pfirsiche

von Wilhelm Bruckisch

Georg Schwarz, Brustbild

Signatur des Originals: S 36/F06470

Georg Schwarz, Adolf Hamm, Alfred Hauck, Gruppenbildnis, Szenenfoto

Signatur des Originals: S 36/F06471