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    A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY

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    Benhabib_ecu_0600D_10545.pdf (1.267Mb)

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    Author
    Benhabib, Sidi Mohammed
    Abstract
    The radial absorbed dose to water, D(r,theta), a quantity not yet directly measured with primary standards, was assessed with the Fricke solution which has been considered as an absolute aqueous solution to perform dosimetry. To determine D(r=2 cm,theta=90°), a hollow quasi-water Fricke ring device filled with Fricke solution was designed to measure the change in the optical density in the Fricke solution at 303 nm wavelength caused by the exposure from a HDR 192Ir radioactive source positioned in its center inside a 15~15~15 cm[superscript]3 PMMA water phantom. A mini-irradiator was also designed and constructed to determine the product of the molar extinction coefficient and the chemical yield value of the Fricke solution at 303 nm against an A-12 ion chamber, in which its main dosimetric parameters to determine the absorbed dose to water were calculated using the PENELOPE Monte Carlo code. To enhance dosimetric accuracy, a large number of measurements were performed with both the quasi-water Fricke ring device and with the mini-irradiator calibration device. The radial absorbed dose to water at r = 2 cm and theta = 90° determined with the quasi-water Fricke ring device was compared against that determined with the HDR treatment planning system Ocentra. The results have shown that if the quantity D(r = 1 cm, theta = 90°) is replaced by D(r = 2 cm, theta= 90°), the methodology employed in this work may be used for clinical applications to determine the absolute radial absorbed dose to water with accuracy comparable to those assessed with Farmer and well-type ion chambers.  
    URI
    http://hdl.handle.net/10342/3717
    Subject
     Physics; Biophysics; Medicine; AAPM TG43; Absorbed dose to water; Dosimetry; Fricke solution; HDR 192Ir; PENELOPE MC code 
    Date
    2011
    Citation:
    APA:
    Benhabib, Sidi Mohammed. (January 2011). A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY (Doctoral Dissertation, East Carolina University). Retrieved from the Scholarship. (http://hdl.handle.net/10342/3717.)

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    MLA:
    Benhabib, Sidi Mohammed. A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY. Doctoral Dissertation. East Carolina University, January 2011. The Scholarship. http://hdl.handle.net/10342/3717. July 07, 2022.
    Chicago:
    Benhabib, Sidi Mohammed, “A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY” (Doctoral Dissertation., East Carolina University, January 2011).
    AMA:
    Benhabib, Sidi Mohammed. A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY [Doctoral Dissertation]. Greenville, NC: East Carolina University; January 2011.
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    East Carolina University

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