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      Measurement of the spectra of multiply-scattered radiation in a medium irradiated with Co60 gamma rays

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      Derbowka_Robert_Michael_1964_sec.pdf (6.484Mb)
      Date
      1964-02
      Author
      Derbowka, Robert Michael
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this investigation, the spectral distributions of multiply-scattered Co60 radiation were measured at depths of 2 cm., 5 cm., 10 cm. and 15 cm. in tissue-equivalent material with beam areas of 25 cm.2 and 100 cm.2. Total-scatter spectra, including both singly- and multiply-scattered radiation, were measured at various angles. Then, upon subtraction of the single-scatter spectra contribution from the total-scatter spectra, multiple-scatter spectra were obtained. The integrated and corrected multiple-scatter spectra were compared to corresponding spectra derived from data calculated by Bruce using the Monte Carlo method. The shapes of the experimental multiple-scatter spectra show fair agreement with Bruce's theoretical spectra. The greatest discrepancy between the spectra occurs in the low-energy end of the spectra. For all measured depths and beam areas the theoretical low-energy peaks appear at an energy from 10 to 30 KeV higher than that of the experimental peaks.
      Degree
      Master of Arts (M.A.)
      Department
      Physics
      Program
      Physics
      Supervisor
      Cormack, D.V.
      Committee
      Woods, R.J.
      Copyright Date
      February 1964
      URI
      http://hdl.handle.net/10388/etd-07062012-113551
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      • Graduate Theses and Dissertations
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