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

H. Koivunoro; T. Schmitz; Eero Hippeläinen; Y.-H. Liu; Tom Serén; Petri Kotiluoto; Iiro Auterinen; S. Savolainen

doi:10.1016/j.apradiso.2014.01.020

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

H. Koivunoro (Corresponding Author), T. Schmitz, Eero Hippeläinen, Y.-H. Liu, Tom Serén, Petri Kotiluoto, Iiro Auterinen, S. Savolainen

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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.

Original language	English
Pages (from-to)	134-138
Journal	Applied Radiation and Isotopes
Volume	88
DOIs	https://doi.org/10.1016/j.apradiso.2014.01.020
Publication status	Published - 1 Jan 2014
MoE publication type	A1 Journal article-refereed

Keywords

BNCT
Dosimetry
Ionization Chamber
MCNP5
Monte Carlo
Penelope

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10.1016/j.apradiso.2014.01.020

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

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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author = "H. Koivunoro and T. Schmitz and Eero Hippel{\"a}inen and Y.-H. Liu and Tom Ser{\'e}n and Petri Kotiluoto and Iiro Auterinen and S. Savolainen",

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doi = "10.1016/j.apradiso.2014.01.020",

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AU - Koivunoro, H.

AU - Schmitz, T.

AU - Hippeläinen, Eero

AU - Liu, Y.-H.

AU - Serén, Tom

AU - Kotiluoto, Petri

AU - Auterinen, Iiro

AU - Savolainen, S.

PY - 2014/1/1

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N2 - 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.

AB - 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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KW - Dosimetry

KW - Ionization Chamber

KW - MCNP5

KW - Monte Carlo

KW - Penelope

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JO - Applied Radiation and Isotopes

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ER -

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

Abstract

Keywords

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