open access

Vol 21, No 2 (2016)
Special Issue Papers
Published online: 2016-03-01
Submitted: 2014-02-28
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Measurement of the S(n,α) cross-section at n_TOF(CERN): Applications to BNCT

Marta Sabaté-Gilarte, Javier Praena, Ignacio Porras, José Manuel Quesada, Pierfrancesco Mastinu
DOI: 10.1016/j.rpor.2014.08.007
·
Rep Pract Oncol Radiother 2016;21(2):113-116.

open access

Vol 21, No 2 (2016)
Special Issue Papers
Published online: 2016-03-01
Submitted: 2014-02-28

Abstract

Aim

The main purpose of this work is to present a new (n,α) cross-section measurement for a stable isotope of sulfur, 33S, in order to solve existing discrepancies.

Background

33S has been studied as a cooperating target for Boron Neutron Capture Therapy (BNCT) because of its large (n,α) cross-section in the epithermal neutron energy range, the most suitable one for BNCT. Although the most important evaluated databases, such as ENDF, do not show any resonances in the cross-section, experimental measurements which provided data from 10[[ce:hsp sp="0.25"/]]keV to 1[[ce:hsp sp="0.25"/]]MeV showed that the lowest-lying and strongest resonance of 33S(n,α) cross-section occurs at 13.5[[ce:hsp sp="0.25"/]]keV. Nevertheless, the set of resonance parameters that describe such resonance shows important discrepancies (more than a factor of 2) between them.

Materials and methods

A new measurement of the 33S(n,α)30Si reaction cross-section was proposed to the ISOLDE and Neutron Time-of-Flight Experiments Committee of CERN. It was performed at n_TOF(CERN) in 2012 using MicroMegas detectors.

Results

In this work, we will present a brief overview of the experiment as well as preliminary results of the data analysis in the neutron energy range from thermal to 100[[ce:hsp sp="0.25"/]]keV. These results will be taken into account to calculate the kerma-fluence factors corresponding to 33S in addition to 10B and those of a standard four-component ICRU tissue.

Conclusions

MCNP simulations of the deposited dose, including our experimental data, shows an important kerma rate enhancement at the surface of the tissue, mainly due to the presence of 33S.

Abstract

Aim

The main purpose of this work is to present a new (n,α) cross-section measurement for a stable isotope of sulfur, 33S, in order to solve existing discrepancies.

Background

33S has been studied as a cooperating target for Boron Neutron Capture Therapy (BNCT) because of its large (n,α) cross-section in the epithermal neutron energy range, the most suitable one for BNCT. Although the most important evaluated databases, such as ENDF, do not show any resonances in the cross-section, experimental measurements which provided data from 10[[ce:hsp sp="0.25"/]]keV to 1[[ce:hsp sp="0.25"/]]MeV showed that the lowest-lying and strongest resonance of 33S(n,α) cross-section occurs at 13.5[[ce:hsp sp="0.25"/]]keV. Nevertheless, the set of resonance parameters that describe such resonance shows important discrepancies (more than a factor of 2) between them.

Materials and methods

A new measurement of the 33S(n,α)30Si reaction cross-section was proposed to the ISOLDE and Neutron Time-of-Flight Experiments Committee of CERN. It was performed at n_TOF(CERN) in 2012 using MicroMegas detectors.

Results

In this work, we will present a brief overview of the experiment as well as preliminary results of the data analysis in the neutron energy range from thermal to 100[[ce:hsp sp="0.25"/]]keV. These results will be taken into account to calculate the kerma-fluence factors corresponding to 33S in addition to 10B and those of a standard four-component ICRU tissue.

Conclusions

MCNP simulations of the deposited dose, including our experimental data, shows an important kerma rate enhancement at the surface of the tissue, mainly due to the presence of 33S.

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Keywords

Neutron capture therapy; [[ce:sup loc=" pre" ]]33S(n,α) cross-section measurement; Data analysis; Monte Carlo simulations; n_TOF(CERN)

About this article
Title

Measurement of the S(n,α) cross-section at n_TOF(CERN): Applications to BNCT

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 21, No 2 (2016)

Pages

113-116

Published online

2016-03-01

DOI

10.1016/j.rpor.2014.08.007

Bibliographic record

Rep Pract Oncol Radiother 2016;21(2):113-116.

Keywords

Neutron capture therapy
[[ce:sup loc="pre"]]33S(n
α) cross-section measurement
Data analysis
Monte Carlo simulations
n_TOF(CERN)

Authors

Marta Sabaté-Gilarte
Javier Praena
Ignacio Porras
José Manuel Quesada
Pierfrancesco Mastinu

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