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Information Journal Paper

Title

SOME STEPS TOWARDS ESTABLISHING A TERTIARY STANDARD DOSIMETRY LABORATORY AT A RADIOTHERAPY DEPARTMENT

Pages

  191-196

Abstract

 Background: In order to deliver the precise dose to the target in radiotherapy, absorbed dose to water at the reference point should be assessed. When the calibration procedure is performed for a reference dosimeter in the 60Co beam of a Secondary Standard Dosimetry Laboratory (SSDL), the total uncertainty in absorbed dose to water (Dw) is estimated to be approximately 1.5%. This study a) empts to re-measure the ND, W factors for all available field chambers at Reza Radiotherapy & Oncology Centre (RROC).Materials and Methods: Consistency and linearity checks were performed for a range of available chambers using a check source. The ND, W factors were also measured for the IONIZATION CHAMBERs. All cylindrical chambers have been cross calibrated at 6 MV photon beam using a Siemens Primus Plus Linac. The Plane Parallel Chamber has been cross calibrated at the highest available electron beam and the ND, W factor has been measured.Results: The tolerance of consistency and linearity checks has been reported to be within 0.3%. The ND, W value for field Farmer chamber was found in agreement with certificate within 1%. In contrast for small active volume chambers, the deviation from the SSDL reports was 2.3%. For the plane parallel chamber, the difference between SSDL and Home measurements are found to be 12%.Conclusion: Although the calibration of reference chambers used for absolute dosimetry through a Primary Standard Dosimetry Laboratory (PSDL) or SSDL is recommended, for field chambers this can be done at home department as a Tertiary Standard Dosimetry Laboratory (TSDL).

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    Cite

    APA: Copy

    ABDOLLAHI, S., MOHAMMADI, MOHAMMAD, EBRAHIMZADEH PEZESHKI, A., & ALIZADEH, Z.. (2015). SOME STEPS TOWARDS ESTABLISHING A TERTIARY STANDARD DOSIMETRY LABORATORY AT A RADIOTHERAPY DEPARTMENT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 13(2), 191-196. SID. https://sid.ir/paper/286626/en

    Vancouver: Copy

    ABDOLLAHI S., MOHAMMADI MOHAMMAD, EBRAHIMZADEH PEZESHKI A., ALIZADEH Z.. SOME STEPS TOWARDS ESTABLISHING A TERTIARY STANDARD DOSIMETRY LABORATORY AT A RADIOTHERAPY DEPARTMENT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2015;13(2):191-196. Available from: https://sid.ir/paper/286626/en

    IEEE: Copy

    S. ABDOLLAHI, MOHAMMAD MOHAMMADI, A. EBRAHIMZADEH PEZESHKI, and Z. ALIZADEH, “SOME STEPS TOWARDS ESTABLISHING A TERTIARY STANDARD DOSIMETRY LABORATORY AT A RADIOTHERAPY DEPARTMENT,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 13, no. 2, pp. 191–196, 2015, [Online]. Available: https://sid.ir/paper/286626/en

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