Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams (Contributo in atti di convegno)

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  • Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams (Contributo in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/978-3-642-03474-9_280 (literal)
Alternative label
  • R. Liuzzi, M. Salvatore, L. Cella (2009)
    Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams
    in World Congress on Medical Physics and Biomedical Engineering, Monaco, Germania, Settembre 7-12
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • R. Liuzzi, M. Salvatore, L. Cella (literal)
Pagina inizio
  • 998 (literal)
Pagina fine
  • 1000 (literal)
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  • IFBME Proceedings (literal)
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  • 25 (literal)
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  • 25/1 (literal)
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  • 1 (literal)
Note
  • Scopus (literal)
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  • Istituto di Biostrutture e Bioimmagini - Consiglio Nazionale delle Ricerche (C.N.R), Napoli, Italy Dipartimento di Diagnostica per Immagini e Radioterapia, Università \"Federico II\", Napoli, Italy (literal)
Titolo
  • Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Olaf Dössel; Wolfgang C. Schlegel (literal)
Abstract
  • Purpose: to verify the extent of equivalence of different Markus ionization chambers and to validate the estimation of free electron fraction value p for parallel ionization chambers in very high dose-per-pulse high-energy electron beams from an intra-operative radiotherapy (IORT) dedicated linear accelerator as proposed in literature. Materials and Methods: dose-to-water values were measured with chemical dosimeters (operated by the Italian Primary Standard Dosimetry Laboratory) and with a parallel-plate ionization chambers (Markus, PTW) in IORT electron beams from a Linac Hitesys Novac7 (Aprilia-Latina, Italy) installed at University \"Federico II\" of Naples. We determined the ion recombination correction factor (ksat) as a function of dose per pulse for the ionization chamber through the estimation of free electron fraction value (p). Results: The estimate of p from experimental data was p=0.336 ± 0.013 .This result was in good agreement with the value found by Di Martino et al. for the same ionization chamber model. Conclusions: This study confirms that parallel ionization chamber can be employed for IORT absorbed dose-to-water measurements and in principle could allow to avoid the use of the more complex chemical dosimetry. (literal)
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