Dosimetry of HDR afterloading machines with Ir-192- und Co-60-sources: comparison of different international protocols

Zeitschrift für medizinische Physik
Golam Abu ZakariaHasin A Azhari

Abstract

The air kerma rate in air at a reference distance of 1 meter from the source is the recommended quantity for the specification of gamma ray source in brachytherapy. The absorbed dose for the patients is directly proportional to the air kerma rate. Therefore the air kerma rate should be determined before the first use of the source on patients by a medical physicist who is independent from the source manufacturer. The air kerma rate will then be applied in the calculation of the dose delivered to patients. In practice, high dose rate (HDR) Ir-192 afterloading machines are mostly used in brachytherapy treatment. Currently HDR-Co-60 increasingly come into operation, too. The essential advantage of the use of Co-60 sources is its longer half-life compared to Ir-192. In addition, the purchasing and disposal costs are lower. The use of HDR-Co-60- afterloading machines is also quite interesting for developing countries. This work describes the dosimetry at HDR afterloading machines according to the protocols DIN 6809-2 (1993) in relation to the DGMP-Report 13 (2006), IAEA-TECDOC-1274 (2002) and AAPM Report 41 (1993) with the nuclides Ir-192 and Co-60. We have used 3 different measurement methods (with a cylindrical chamber in solid ph...Continue Reading

References

Nov 1, 1993·Medical Physics·J G Holt
Apr 22, 2005·Physics in Medicine and Biology·Guilhem DouyssetUNKNOWN University of Wisconsin Accredited Dosimetry Calibration Laboratory
Mar 28, 2008·Physics in Medicine and Biology·Guilhem DouyssetRebecca Nutbrown
Jul 21, 2009·Medical Physics·Mark J RivardLuc Beaulieu

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