IAEA TRS 381 PDF

New codes of practice for reference dosimetry in clinical high-energy photon and electron beams have been published recently, to replace the air kerma based codes of practice that have determined the dosimetry of these beams for the past twenty years. Measurements were performed in three clinical electron beam energies using two NEtype cylindrical chambers, two Markus-type plane-parallel chambers and two NACPtype plane-parallel chambers. Dosimetry based on direct calibrations of all chambers in 60Co was investigated, as well as dosimetry based on cross-calibrations of plane-parallel chambers against a cylindrical chamber in a high-energy electron beam. Furthermore, 60Co perturbation factors for plane-parallel chambers were derived. The results thus show that neither the chamber-to-chamber variations, nor the obtained absolute dose values are significantly altered by changing from air kerma based dosimetry to absorbed dose based dosimetry when using calibration factors obtained from the Laboratory for Standard Dosimetry, Ghent, Belgium.

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New codes of practice for reference dosimetry in clinical high-energy photon and electron beams have been published recently, to replace the air kerma based codes of practice that have determined the dosimetry of these beams for the past twenty years. Measurements were performed in three clinical electron beam energies using two NEtype cylindrical chambers, two Markus-type plane-parallel chambers and two NACPtype plane-parallel chambers.

Dosimetry based on direct calibrations of all chambers in 60Co was investigated, as well as dosimetry based on cross-calibrations of plane-parallel chambers against a cylindrical chamber in a high-energy electron beam. Furthermore, 60Co perturbation factors for plane-parallel chambers were derived. The results thus show that neither the chamber-to-chamber variations, nor the obtained absolute dose values are significantly altered by changing from air kerma based dosimetry to absorbed dose based dosimetry when using calibration factors obtained from the Laboratory for Standard Dosimetry, Ghent, Belgium.

The values of the 60Co perturbation factor for plane-parallel chambers k att x k m for the air kerma based and p wall for the absorbed based codes of practice that are obtained from comparing the results based on 60Co calibrations and cross-calibrations are within the experimental uncertainties in agreement with the results from other investigators.

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Full-text links Cite Favorites. Abstract New codes of practice for reference dosimetry in clinical high-energy photon and electron beams have been published recently, to replace the air kerma based codes of practice that have determined the dosimetry of these beams for the past twenty years. Huq MS, et al. Phys Med Biol. PMID: Protocols for the dosimetry of high-energy photon and electron beams: a comparison of the IAEA TRS and previous international codes of practice.

International Atomic Energy Agency. Andreo P, et al. Absorbed dose to water based dosimetry versus air kerma based dosimetry for high-energy photon beams: an experimental study. Palmans H, et al. Med Phys. Epub Oct PMID: Review. Advances in the determination of absorbed dose to water in clinical high-energy photon and electron beams using ionization chambers. Huq MS, Andreo P. Show more similar articles See all similar articles. Cited by 2 articles Evaluation of clinical use of OneDose metal oxide semiconductor field-effect transistor detectors compared to thermoluminescent dosimeters to measure skin dose for adult patients with acute lymphoblastic leukemia.

Al-Mohammed HI. N Am J Med Sci. Mattar EH, et al. Med Sci Monit. Publication types Comparative Study Actions. Evaluation Study Actions. Validation Study Actions. Quality Control Actions. Radiotherapy Dosage Actions. Reference Standards Actions. Reproducibility of Results Actions. Sensitivity and Specificity Actions.

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AFSPA 1958 PDF

Division of Human Health

An errata file for the printed version is also available here: Corrections since CoP publ Furthermore, users can download the most final version of the Code of Practice to date, with corrections and updates inserted, from here. Finally, a link to the worksheets is provided at the bottom of this page. The development of primary standards of absorbed dose to water for high-energy photons and electrons offers the possibility of reducing the uncertainty in the dosimetry of radiotherapy beams. Many standard laboratories already provide calibrations at the radiation quality of 60 Co gamma-rays. Some laboratories have extended calibrations to high-energy photon and electron beams or are in the stage of developing the necessary techniques for these modalities.

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