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33S(n,α) cross section measurement at n TOF: Implications in neutron capture therapy

AutorPorras, Ignacio; Praena, Javier ; Sabaté-Gilarte, Marta; Quesada, José Manuel
Palabras claveAlfa
Fecha de publicación2013
ResumenThe 33S(n,α) cross section is of interest in medical physics since it has been proposed as a possible/alternative cooperating target to boron neutron capture therapy due to the remarkable feature of the 33S(n,α) reaction channel at epithermal neutron energies: alpha particle energy above 3 MeV in absence of gamma emission. The scarce experimental data which are available at present show that, in principle, the lowest-lying and strongest resonance occurs at neutron energy of 13.5 keV. Epithermal neutron beams of around 10 keV are considered the optimal ones for neutron capture therapy. According to the available data, the resonance peak at that energy is larger than the hydrogen elastic scattering cross section, the dominant mechanism of epithermal neutron interactions in tissue. Nevertheless, the set of resonance parameters which determine the 33S(n,α) cross section at these energies present important discrepancies (more than a factor two) between different measurements and they are not described by the most popular evaluated data bases such as ENDF or JENDL. The present work aims to contribute in this aspect which is evinced by Monte Carlo simulations that, even based on the most conservative values of the lowest resonances, have shown a noticeable local increase of the dose at the isotope site with a neutron beam of 13.5 keV. Preliminary tests of the measurement of the 33S(n,α) reaction were successfully performed at n TOF-CERN during 2011. In particular, the first low-lying resonance was measured (with low statistics) using a micromegastype detector and with the 10B(n,α) cross section as a standard. The results of this test will be shown. The kerma-fluence factors corresponding to 10B, 33S and those of a standard four-component ICRU tissue have been calculated for using them is Monte Carlo simulations of the dose deposited on tissue. The comparison between different evaluated data and experimental data will be shown. Following its approval by the ISOLDE and Neutron Time-Of-Flight (INTC) committee at CERN, the measurement of 33S(n,α) reaction cross section will be performed at n TOF-CERN in October-November 2012. The results of a preliminary data analysis will be shown, too.
DescripciónResumen del trabajo presentado a la: "International Conference on Nuclear Data for Science and Technology" celebrada en New York (US) del 4 al 8 de marzo de 2013.-- et al.and the n TOF Collaboration.
Aparece en las colecciones: (CNA) Comunicaciones congresos
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