open access

Vol 24, No 6 (2019)
Original research articles
Published online: 2019-11-01
Submitted: 2018-11-07
Get Citation

Feasibility study on the use of 230MeV proton cyclotron in proton therapy centers as a spallation neutron source for BNCT

E. Nobakht, N. Fouladi
DOI: 10.1016/j.rpor.2019.10.005
·
Rep Pract Oncol Radiother 2019;24(6):644-653.

open access

Vol 24, No 6 (2019)
Original research articles
Published online: 2019-11-01
Submitted: 2018-11-07

Abstract

Aim

The feasibility of using 230MeV proton cyclotrons in proton therapy centers as a spallation neutron source for Boron Neutron Capture Therapy (BNCT) was investigated.

Background

BNCT is based on the neutron irradiation of a 10B-containing compound located selectively in tumor cells. Among various types of neutron generators, the spallation neutron source is a unique way to generate high-energy and high-flux neutrons.

Materials and Methods

Neutron beam was generated by a proton accelerator via spallation reactions and then the produced neutron beam was shaped to be appropriate for BNCT. The proposed Beam Shaping Assembly (BSA) consists of different moderators, a reflector, a collimator, as well as thermal and gamma filters. In addition, the simulated Snyder head phantom was utilized to evaluate the dose distribution in tumor and normal tissue due to the irradiation by the designed beam. MCNPX2.6 Monte Carlo code was used to optimize BSA as well as evaluate dose evaluation.

Results

A BSA was designed. With the BSA configuration and a beam current of 104nA, epithermal neutron flux of 3.94×106 [n/cm2] can be achieved, which is very low. Provided that we use the beam current of 5.75μA, epithermal neutron flux of 2.18×108 [n/cm2] can be obtained and the maximum dose of 38.2 Gy-eq can be delivered to tumor tissue at 1.4cm from the phantom surface.

Conclusions

Results for 230MeV protons show that with proposed BSA, proton beam current about 5.75μA is required for this purpose.

Abstract

Aim

The feasibility of using 230MeV proton cyclotrons in proton therapy centers as a spallation neutron source for Boron Neutron Capture Therapy (BNCT) was investigated.

Background

BNCT is based on the neutron irradiation of a 10B-containing compound located selectively in tumor cells. Among various types of neutron generators, the spallation neutron source is a unique way to generate high-energy and high-flux neutrons.

Materials and Methods

Neutron beam was generated by a proton accelerator via spallation reactions and then the produced neutron beam was shaped to be appropriate for BNCT. The proposed Beam Shaping Assembly (BSA) consists of different moderators, a reflector, a collimator, as well as thermal and gamma filters. In addition, the simulated Snyder head phantom was utilized to evaluate the dose distribution in tumor and normal tissue due to the irradiation by the designed beam. MCNPX2.6 Monte Carlo code was used to optimize BSA as well as evaluate dose evaluation.

Results

A BSA was designed. With the BSA configuration and a beam current of 104nA, epithermal neutron flux of 3.94×106 [n/cm2] can be achieved, which is very low. Provided that we use the beam current of 5.75μA, epithermal neutron flux of 2.18×108 [n/cm2] can be obtained and the maximum dose of 38.2 Gy-eq can be delivered to tumor tissue at 1.4cm from the phantom surface.

Conclusions

Results for 230MeV protons show that with proposed BSA, proton beam current about 5.75μA is required for this purpose.

Get Citation

Keywords

Beam Shaping Assembly (BSA); Boron neutron capture therapy (BNCT); MCNPX2.6; Spallation neutron source; Proton accelerator

About this article
Title

Feasibility study on the use of 230MeV proton cyclotron in proton therapy centers as a spallation neutron source for BNCT

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 6 (2019)

Pages

644-653

Published online

2019-11-01

DOI

10.1016/j.rpor.2019.10.005

Bibliographic record

Rep Pract Oncol Radiother 2019;24(6):644-653.

Keywords

Beam Shaping Assembly (BSA)
Boron neutron capture therapy (BNCT)
MCNPX2.6
Spallation neutron source
Proton accelerator

Authors

E. Nobakht
N. Fouladi

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: journals@viamedica.pl