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Dose audit using a glass dosimeter for Radiation Therapy Facilities in East-Asian Countries

  • H. Mizuno
  • Y. K. Nakamura
  • S. Sakata
  • K. Tabushi
  • Y. Kusano
  • A. Nagano
  • A. Fukumura
  • T. Kanai
  • H. Tsujii
Conference paper
Part of the IFMBE Proceedings book series (IFMBE, volume 25/1)

Abstract

A dose audit using a photoluminescent glass dosimeter was conducted in radiation therapy facilities in a number of East-Asian countries. The audit was performed for the reference condition of linac X-ray beams, which was a 10x10 cm2 field and a 10cm depth with a SSD of 90 cm. Eight facilities from 5 countries, China, Korea, Indonesia, Viet Nam and the Philippines, participated in this audit. The ratios of deviation between the user-stated dose and the NIRS measured dose were analyzed. Among 24 X-rays beams measured from 6 to 20MV, 22 beams were within optimum levels (±3%) and 1 beam was out of the optimum level but within the tolerance level (±5%). However, 1 beam exceeded the tolerance level. The standard deviation of the ratios of deviation was 1.4%. A thorough and lengthy investigation was performed regarding this beam, which was observed to have a large rate of deviation (+6.1%). Finally, the cause became clear when it was determined that an incorrect pressure value in the calibration of a monitoring unit had been used. This event shows the importance of external audit in radiation therapy.

Keywords

QA/QC dose audit glass dosimeter Radiation therapy East-Asian Countries 

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • H. Mizuno
    • 1
  • Y. K. Nakamura
    • 2
  • S. Sakata
    • 3
  • K. Tabushi
    • 4
  • Y. Kusano
    • 3
  • A. Nagano
    • 1
  • A. Fukumura
    • 1
  • T. Kanai
    • 1
  • H. Tsujii
    • 1
  1. 1.National Institute of Radiological Sciences/Research Center for Charged Particle TherapyChibaJapan
  2. 2.Clinic C4FunabashiJapan
  3. 3.Association for Nuclear Technology in MedicineTokyoJapan
  4. 4.School of Health SciencesNagoya UniversityNagoyaJapan

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