Audit on source strength determination for HDR and PDR (192)Ir brachytherapy in Sweden

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
Asa Carlsson Tedgren, Jan-Erik Grindborg

Abstract

To investigate the status of source strength determination in terms of reference air kerma rate (RAKR) for HDR and PDR (192)Ir brachytherapy in Sweden. RAKR was determined in each of the 14 Swedish afterloaders, using calibrated equipment from the Swedish Secondary Standard Dosimetry Laboratory. Values of RAKR from the external audit, the hospitals and vendors agreed within the uncertainty limits guaranteed by the vendors. The accuracy in RAKR determination has increased over the last years as a result of increased availability of interpolation standards for HDR (192)Ir and the increased use of robust well-type ion chambers designed for brachytherapy. It is recommended to establish a ratio between the RAKR value from own measurements at the hospital and that of the vendor since such a ratio embeds constant systematic differences due to e.g. varying traceability and therefore has the potential of being less uncertain than the RAKR alone. Traceability to primary standards for HDR (192)Ir sources will in the future significantly decrease the uncertainty in RAKR of (192)Ir brachytherapy.

References

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Jan 1, 1984·Acta Radiologica. Oncology·A Brahme
Feb 1, 1994·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·J L VenselaarA H Aalbers
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Citations

May 9, 2014·The British Journal of Radiology·A L PalmerA Nisbet
Sep 9, 2008·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Asa Carlsson TedgrenJeanette Wolke
Jul 23, 2013·Journal of Medical Imaging and Radiation Oncology·Annette HaworthTomas Kron
Sep 4, 2015·The British Journal of Radiology·Catharine H ClarkDavid I Thwaites
Jan 15, 2015·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Antony L PalmerAndrew Nisbet
Nov 26, 2009·Physics in Medicine and Biology·Antony Palmer, Bongile Mzenda

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