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  • 1
    Electronic Resource
    Electronic Resource
    Tumor therapy and track structure (1999)
    Springer
    Radiation and environmental biophysics 38 (1999), S. 229-237 
    Details
    ISSN: 1432-2099
    Keywords: Key words Ions ; Tumor therapy ; RBE ; Track structure ; Treatment planning ; Carbon beam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract  The elevated relative biological effectiveness (RBE) of heavy ions like carbon is the main reason for their use in radiotherapy and is due to the microscopic distribution of dose inside each particle track. High local doses produce lesions that are expected to have a diminished possibility of repair. Thus, RBE depends on track structure and on the biological repair capacity of the tissue that is affected by the irradiation. For tumor treatment planning with heavy ions, the beam quality and the tissue sensitivity have to be taken into account. Using the dependence of radial dose distribution on particle energy and atomic number on the physical side and x-ray dose response for the repair capacity on the biological side, the response to particle irradiation can be calculated in the local effect model (LEM) and used for treatment planning. This article traces the route from electron emission as the basis of track structure to the RBE calculation and the application in treatment planning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004110050163
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  • 2
    Electronic Resource
    Electronic Resource
    Beitrag zur Kenntnis der sauren Barium-diphosphateProfessor Paul Royen zum 60, Geburtstage am 17. Dezember 1964 gewidmet. (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 334 (1964), S. 15-20 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The precipitation of diphosphate from solutions of secondary alkali diphosphates by means of Ba2+ yields the acid salt Ba7H2P8O28·6H2O. With increasing alkalinity of the solutions, the hydrogen ion content of the Ba salt precipitate decreases. Precipitation from Na4-diphosphate solutions yields the neutral Ba2P2O7·1,5 H2O. From X-ray investigations (no structural differences between the two precipitates being found) it in concluded that the “neutral” Ba diphosphate has a phase range from Ba:H = 2:0 to 7:2.
    Notes: Ba2+ bildet-im Unterschied zu vielen anderen zweiwertigen Metallen-bei der Fällung aus Lösungen sekundärer Diphosphate ein saures Diphosphat, Ba7H2P8O28·6H2O. Mit steigender Alkalität der Fällungslösung nimmt die Acidität der Ba-Verbindung ab. Das neutrale Na-Diphosphat entsteht nur bei der Fällung aus quaternären Diphosphat-Lösungen. Bemerkenswerterweise besteht kein struktureller Unterschied zwischen den sauren Verbindungen und dem quaternären Salz, was zu der Annahme führt, daß das quaternäre Ba-Diphosphat eine Phasenbreite zwischen Ba:H = 2:0 und 7:2 besitzt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643340104
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    Paper (German National Licenses)
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