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Dosimetric accuracy of a cross-calibration coefficient for plane-parallel ionization chamber obtained in low-energy electron beams using various cylindrical dosimeters

Polaczek-Grelik Kinga, Kawa-Iwanicka Aneta, Michalecki Łukasz

Polish Journal of Medical Physics and Engineering

2021

Vol. 27, Iss. 4

303--313

Introduction: The accuracy of the cross-calibration procedure depends on ionization chamber type, both used as reference one and under consideration. Also, the beam energy and phantom medium could influence the precision of cross calibration coefficient, resulting in a systematic error in dose estimation and thus could influence the linac beam output checking. This will result in a systematic mismatch between dose calculated in treatment planning system and delivered to the patient. Material and methods: The usage of FC65-G, CC13 and CC01 thimble reference chambers as well as 6, 9, and 15 MeV electron beams has been analyzed. A plane-parallel PPC05 chamber was calibrated since scarce literature data are available for this dosimeter type. The influence of measurement medium and an effective point of measurement (EPOM) on obtained results are also presented. Results: Dose reconstruction precision of ~0.1% for PPC05 chamber could be obtained when cross-calibration is based on a thimble CC13 chamber. Nd,w,Qcross obtained in beam ≥ 9MeV gives 0.1 – 0.5% precision of dose reconstruction. Without beam quality correction, 15 MeV Nd,w,Qcross is 10% lower than Co-60 Nd,w,0. Various EPOM shifts resulted in up to 0.6% discrepancies in Nd,w,Qcross values. Conclusions: Ionization chamber with small active volume and tissue-equivalent materials supplies more accurate cross-calibration coefficients in the range of 6 – 15 MeV electron beams. In the case of 6 and 9 MeV beams, the exact position of an effective point of measurement is of minor importance. In-water cross-calibration coefficient can be used in a solid medium without loss of dose accuracy.

Low energy electron beams for industrial and environmental applications

Skarda V.

Postępy Techniki Jądrowej

2017

z. 1

10--11

8-9 grudnia 2016 r., w Warszawie odbyły się warsztaty EuCARD-2 pt.: “Niskoenergetyczne wiązki elektronów do zastosowań w przemyśle i ochronie środowiska”. Organizatorami warsztatów byli: Rada Naukowo-Technologiczna, Wielka Brytania, Europejska Organizacja Badań Jądrowych (CERN), Szwajcaria, Instytut Chemii i Techniki Jądrowej, Polska, Instytut Fraunhofera, Wydział ds. Wiązki Elektronów i Technologii Plazmowych, Niemcy, Politechnika Warszawska, Polska. W artykule omówiono cele, tematykę warsztatów oraz sposoby upowszechnienia i wykorzystania wyników spotkania. Została załączona lista organizatorów.

EuCARD-2 Workshop, 8-9 December 2016, Warsaw, Poland. Organizers: Science and Technology Facilities Council, UK CERN - The European Organization for Nuclear Research, Switzerland, Institute of Nuclear Chemistry and Technology, Poland, Fraunhofer Institute for Electron Beam and Plasma Technology, Germany, Warsaw University of Technology, Poland. An article presents short information about EuCARD-2 Workshop “Low energy electron beams for industrial and environmental applications”, which was held in December 2016 in Warsaw. Objectives, main topics and expected output of meeting are described. List of organizers is included.