Dosimetry is fundamental for radiotherapy including brachytherapy. It has been recognised that harmonising dosimetry internationally is essential. The IAEA, working with various professional societies, has been key in writing international codes of practice for dosimetry.

In 2023 the IAEA published TRS-492, dosimetry in brachytherapy, which addresses SSDLs and hospitals. This is the first code of practice for brachytherapy as the IAEA had previously published an IAEA-TECDOC-1274 Guidelines on standardized procedures at Secondary Standards Dosimetry Laboratories (SSDLs) and hospitals. The TRS-398 Rev.1, Absorbed Dose Determination in External Beam Radiotherapy was published in 2024. This is a revision of the previous publication from the year 2000. This publication addresses the need for a systematic and internationally unified approach to the calibration of ionization chambers in terms of absorbed dose to water and to the use of these detectors in the determination of absorbed dose to water for the radiation beams used in radiotherapy — namely low, medium, and high energy photon beams, electron beams, proton beams and heavier ion beams. It is addressed to users provided with calibrations in terms of absorbed dose to water traceable to a standards dosimetry laboratory. The SSDL’s also implement the formalism and code of practice discussed in this publication.

Topics

- Implementation in high energy photon beams

- Implementation in high energy electron beams

- Implementation in low and medium energy kilovoltage X ray beams

- Implementation in protons and light ion beams

- Code of practice for well type chamber calibration and source strength measurements

- Application of reference quantities in the hospital

Speakers
K. Christaki, IAEA, Austria
H. Palmans, NPL, UK

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