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    National Tsing Hua University Institutional Repository > 原子科學院  > 生醫工程與環境科學系 > 期刊論文 >  Performance evaluation of graphite pancake ionization chamber by comparing the absorbed dose to water calibration

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61824

    Title: Performance evaluation of graphite pancake ionization chamber by comparing the absorbed dose to water calibration
    Authors: Lee JH;Lin CY;Wang CF;Butler DJ;Webb DV;Yeh CY;Hwang WS
    教師: 王竹方
    Date: 2006
    Publisher: Elsevier
    Relation: Radiation Measurements, Volume 41, Issue 3, Pages 306-316
    Keywords: graphite pancake ionization chamber
    absorbed dose to water
    Abstract: This paper describes modifications to an original design, correction factors and uncertainty evaluations for a graphite pancake ionization chamber constructed at the Institute of Nuclear Energy Research (INER, Taiwan). A bilateral comparison of the absorbed dose to water standards for Co-60 using transfer chambers was performed to verify the graphite chamber experimental accuracy and measurement consistency. The comparison results showed a satisfactory agreement in the measurements within the combined standard uncertainties (k = 1). This paper also compares the absorbed dose to water calibration in medical accelerator photon beams traceable to INER standards following the recommendations given in the AAPM TG-21 and TG-51 dosimetry protocols. For all types of linear accelerators and cylindrical chambers at 13 participating hospitals in Taiwan, the TG-51/TG-21 dose ratios were the same within +/- 1.5%, less than the combined uncertainty, irrespective of the chamber make and model for each photon included here. A quality assurance guide for institutions switching from the TG-21 to TG-51 protocol was suggested based on the comparison results for the two dosimetry protocols.
    URI: http://www.elsevier.com/
    Appears in Collections:[生醫工程與環境科學系] 期刊論文

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