The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber

H. Koivunoro, T. Schmitz, E. Hippeläinen, Y. H. Liu, T. Serén, P. Kotiluoto, I. Auterinen, S. Savolainen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The mixed neutron-photon beam of FiR 1 reactor is used for boron-neutron capture therapy (BNCT) in Finland. A beam model has been defined for patient treatment planning and dosimetric calculations. The neutron beam model has been validated with an activation foil measurements. The photon beam model has not been thoroughly validated against measurements, due to the fact that the beam photon dose rate is low, at most only 2% of the total weighted patient dose at FiR 1. However, improvement of the photon dose detection accuracy is worthwhile, since the beam photon dose is of concern in the beam dosimetry. In this study, we have performed ionization chamber measurements with multiple build-up caps of different thickness to adjust the calculated photon spectrum of a FiR 1 beam model.

Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalApplied Radiation and Isotopes
Volume88
DOIs
Publication statusPublished - 1 Jan 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

photon beams
ionization chambers
Photons
adjusting
Air
dosage
air
neutron beams
Neutrons
Finland
photons
Boron Neutron Capture Therapy
caps
dosimeters
planning
foils
therapy
boron
reactors
activation

Keywords

  • BNCT
  • Dosimetry
  • Ionization Chamber
  • MCNP5
  • Monte Carlo
  • Penelope

Cite this

Koivunoro, H. ; Schmitz, T. ; Hippeläinen, E. ; Liu, Y. H. ; Serén, T. ; Kotiluoto, P. ; Auterinen, I. ; Savolainen, S. / The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber. In: Applied Radiation and Isotopes. 2014 ; Vol. 88. pp. 134-138.
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abstract = "The mixed neutron-photon beam of FiR 1 reactor is used for boron-neutron capture therapy (BNCT) in Finland. A beam model has been defined for patient treatment planning and dosimetric calculations. The neutron beam model has been validated with an activation foil measurements. The photon beam model has not been thoroughly validated against measurements, due to the fact that the beam photon dose rate is low, at most only 2{\%} of the total weighted patient dose at FiR 1. However, improvement of the photon dose detection accuracy is worthwhile, since the beam photon dose is of concern in the beam dosimetry. In this study, we have performed ionization chamber measurements with multiple build-up caps of different thickness to adjust the calculated photon spectrum of a FiR 1 beam model.",
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The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber. / Koivunoro, H.; Schmitz, T.; Hippeläinen, E.; Liu, Y. H.; Serén, T.; Kotiluoto, P.; Auterinen, I.; Savolainen, S.

In: Applied Radiation and Isotopes, Vol. 88, 01.01.2014, p. 134-138.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber

AU - Koivunoro, H.

AU - Schmitz, T.

AU - Hippeläinen, E.

AU - Liu, Y. H.

AU - Serén, T.

AU - Kotiluoto, P.

AU - Auterinen, I.

AU - Savolainen, S.

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