CALIBRATION OF HIGH DOSE RATE COBALT-60 SOURCE USING A FARMER TYPE CHAMBER IN A LOCALLY CONSTRUCTED HOLLOW PHANTOM

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  • Department: Philosophy
  • Project ID: PHI0181
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  • Pages: 120 Pages
  • Format: Microsoft Word
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ABSTRACT

An important aspect of general quality assurance program for brachytherapy dosimetry is source calibration. Vendors assign large uncertainties of up to ±10 % for the stated source calibrated values. It is thus important to check the vendor stated calibration. There are three main methods of calibrating brachytherapy sources and they are the “Free- in – air” method, using a re-entrant(well ) type chamber and using a thimble (Farmer) type ionization chamber in a phantom. The main objective of this study was to compare values of source strength obtained by using the re-entrant chamber method and the thimble (farmer) type ionization chamber in a phantom method. A cylindrical hollow phantom was constructed from Poly methyl methacrylate (PMMA) having four holes located at a distance of 8cm from the centre and the angle between each of the holes being 90° from the centrally located source holder . The experimental set up followed International Atomic Energy Agency (IAEA) Technical Document 1274 (IAEA-TECDOC-1274) for the re-entrant chamber method and DIN 68909-2 in combination with DGMP report 13 for the thimble ionization chamber in a phantom method. Measurements carried out using the well type chamber deviated from the theoretical value of the source by -1.36% whereas those measured by the Farmer type ionization chamber in a locally constructed phantom deviated from the theoretical air kerma strength value by -2.1%. The difference in measured values from the two measuring methods was found to be0.8%.

CALIBRATION OF HIGH DOSE RATE COBALT-60 SOURCE USING A FARMER TYPE CHAMBER IN A LOCALLY CONSTRUCTED HOLLOW PHANTOM
For more Info, call us on
+234 8130 686 500
or
+234 8093 423 853

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  • Type: Project
  • Department: Philosophy
  • Project ID: PHI0181
  • Access Fee: ₦5,000 ($14)
  • Pages: 120 Pages
  • Format: Microsoft Word
  • Views: 243
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    Details

    Type Project
    Department Philosophy
    Project ID PHI0181
    Fee ₦5,000 ($14)
    No of Pages 120 Pages
    Format Microsoft Word

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