title: Supplementary values of the dosimetric parameters kNR and Em for various types of detectors in 6 and 15 MV photon fields.
abstract: The present communication broadens the data base for determinations of the non-reference condition correction factor kNR needed in high-energy photon dosimetry to accomplish the use of various detectors under non-reference conditions. Following our previous strategy of calculating semiempirical values of kNR and correlating them with the mean photon energy Em at the point of measurement in a large water phantom, the values of Em are now stated for 6 and 15 MV photon radiations of accelerators with and without flattening filters, square field sizes from 1 to 30 cm side length and depths from 0 to 28 cm. The unambiguity of the kNR-Em correlation is again confirmed and is quantified by fitting formulae for air-filled ionization chambers, TLD detectors and Si diodes. This survey provides a practicable access to the kNR values, particularly for the non-water equivalent detectors to be used in small-field dosimetry.
authors: Working Group Medical Radiation Physics, Carl von Ossietzky University Oldenburg, Germany; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, Germany. Electronic address: cmark23@hotmail.com.
authors: Ndimofor
authors: N
authors: Chofor
authors: Prof. em., Medical Physics and Biophysics, Georg-August University Göttingen, Germany.
authors: Dietrich
authors: D
authors: Harder
authors: Working Group Medical Radiation Physics, Carl von Ossietzky University Oldenburg, Germany; Pius-Hospital, Clinic of Radiotherapy and Oncology, Oldenburg, Germany.
authors: Björn
authors: B
authors: Poppe
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis / Q000379:methods / Q000592:standards; D038622:Internationality; D010315:Particle Accelerators / Q000295:instrumentation*; D017785:Photons; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D011879:Radiotherapy Dosage; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
keywords: Detektor-Ansprechvermögen; FFF accelerators; FFF-Beschleuniger; Korrektionsfaktor; Nicht-Referenzbedingungen; Strahlungsqualität; correction factor; detector response; kleine Felder; mean photon energy; mittlere Photonenenergie; non-reference conditions; radiation quality; small fields