Article Technical consultation to the IAEA regarding dose audit system using radiophotoluminescent glass dosimeter developed by NIRS

水野, 秀之

In Japan, postal dose audits have been performed on radiationtherapy units using radiophotoluminescent glass dosimeters(RGDs), since 2007 [1]. NIRS developed this auditing system andhas supported its technical aspects continuously. For instance,the application of RGDs to a non-reference condition beam suchas field size change or wedged field were studied by NIRS andsuccessfully introduced in the routine dose audit in 2010 [2] [3].The IAEA / WHO have performed postal dose audits worldwidesince 1969 using thermoluminescent dosimeters (TLDs). Recently,They have considered the replacement of TLDs by RGDs.RGDs are made in Japan and offer some superior features: RGDsare almost completely free from the fading effect and can be readrepeatedly. NIRS and IAEA have done an annual dosimetric intercomparisonbetween RGDs and TLDs since 2008 (Fig.1). The outputsof both dosimeters agreed within ±1% (Table1). In 2013,IAEA installed a new RGD reader from Japan and started commissioningof the RGD system. IAEA asked NIRS to support thiswork and I stayed at the IAEA Dosimetry Laboratory for 1 yearfrom August 2013 as a consultant on the RGD system commissioning.

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