Neutron-induced reactions on AlF3 studied using the optical model

Ma, Chun-Wang; Lv, Cui-Juan; Zhang, Guoqiang; Wang, Hongwei; Zuo, J. X.

doi:10.1016/j.nimb.2015.04.060

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…[17]. Interactions of aluminum material with epithermal neutrons are predominantly through 27 Al(n, 2n) 26 Al reactions [18]. As for BiF 3 , its contribution to fast neutron moderation is due to the presence of fluorine element in BiF 3 .…”

Section: Resultsmentioning

confidence: 99%

Optimization and analysis of neutron distribution on 30 MeV cyclotron-based double layer beam shaping assembly (DLBSA)

Bilalodin¹,

Suparta²,

Hermanto³

et al. 2019

Nucl. Phys. At. Energy

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Design and optimization of double layer Beam Shaping Assembly (DLBSA) has been conducted using the MCNPX code. The BSA is configured to comply with such a construction having typically a double moderator, a reflector, a collimator, and a filter. The optimization of various combinations of materials that compose the moderator, reflector, and filter yields such quality and intensity of radiation beams that conform to the requirements for Boron Neutron Capture Therapy. The composing materials are aluminum and BiF 3 for moderator, lead and graphite for the reflector, nickel and polyethylene borate for the collimator, and iron and cadmium for the filter. Typical beam parameters measured at the exit of the collimator are epithermal neutron flux of 1.110 9 n/(cm 2 s), the ratio of epithermal neutron flux to thermal neutron and fast neutron flux 344 and 85, respectively, and the values of fast neutron and gamma dose to epithermal neutron flux 1.0910-13 Gycm 2 and 1.8210-13 Gycm 2 , respectively. Analysis of epithermal neutron flux and neutron beam spectrum using the PHITS code reveals that the distribution of epithermal neutron spreads out in the DLBSA. The highest intensity is found in the moderator and decline downstream of the collimator and filter. The spectrum of neutron beams displays a narrow spike with that peaks at 10 keV.

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Section: Resultsmentioning

confidence: 99%

Optimization and analysis of neutron distribution on 30 MeV cyclotron-based double layer beam shaping assembly (DLBSA)

Bilalodin¹,

Suparta²,

Hermanto³

et al. 2019

Nucl. Phys. At. Energy

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“…A small fraction of gamma rays was also generated from capture reactions through 9 4 Be(p,γ) 10 4 Be reactions and inelastic collision mechanisms in the form of 9 4 Be(n,n ′ γ) reaction (Hu et al 2016). Gamma particles were produced from the reaction of neutrons with aluminum through 27 Al(n,γ) 28 Al reactions (Ma et al 2015). Gamma particles enter the phantom and interact with H and O, losing their energy through mechanisms of photoelectric effect, Compton scattering, and pair production (Lamarsh and Baratta 2001).…”

Section: Resultsmentioning

confidence: 99%

Characteristics in Water Phantom of Epithermal Neutron Beam Produced by Double Layer Beam Shaping Assembly

Bilalodin

Suparta

Hermanto

et al. 2019

AJSTD

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A Double Layer Beam Shaping Assembly (DLBSA) was designed to produce epithermal neutrons for BNCT purposes. The Monte Carlo N-Particle eXtended program was used as the software to design the DLBSA and phantom. Distribution of epithermal neutron and gamma flux in the DLBSA and phantom and absorbed dose in the phantom were computed using the Particle and Heavy Ion Transport code System program. Testing results of epithermal neutron beam irradiation of the water phantom showed that epithermal neutrons were thermalized and penetrated the phantom up to a depth of 12 cm. The maximum value of the absorbed dose was 2 × 10-3 Gy at a depth of 2 cm in the phantom.

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“…Aluminum, (Al) as the main moderator, has the high cross section to energies higher than ten keV [22]. Interactions between neutrons and Al material produce epithermal neutrons, particularly through 27 Al(n,2n) 26 Al reactions [23]. Containing fluorine (F), it is the second moderator that contributes.…”

Section: Discussionmentioning

confidence: 99%

“…Gamma particles in the double-layered BSA predominantly results from interactions of protons with beryllium target through Li Li p Be ′ reactions [28]. Gamma particles are also produced by the reaction between neutron and aluminum through 27 Al(n,γ) 28 Al reactions [23]. The gamma particles can be reduced by Pb material placed at the end of double-layered BSA, sincePb is very good in absorbing gamma particles [12].…”

Section: Discussionmentioning

confidence: 99%

Optimization of double layered beam shaping assembly using genetic algorithm

Bilalodin

Kusminarto

Suparta

et al. 2018

Polish Journal of Medical Physics and Engineering

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The genetic algorithm method is a new method used to obtain radiation beams that meet the IAEA requirements. This method is used in optimization of configurations and compositions of materials that compose double layered Beam Shaping Assembly (BSA). The double layered BSA is modeled as having two layers of material for each of the components, which are the moderator, reflector, collimator, and filter. Up to 21st generation, the optimization results in four (4) individuals having the capacity to generate the most optimum radiation beams. The best configuration, producing the most optimum radiation beams, is attained by using combinations of materials, that is by combining Al with either one of CaF2 and PbF2for moderator; combining Pb material with either Ni or Pb for reflector; combining Ni and either FeC or C for collimator, and FeC+LiF and Cd for fast and thermal neutron filter. The parameters of radiation resulted from the four configurations of double layer BSA adequately satisfy the standard of the IAEA.

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Neutron-induced reactions on AlF3 studied using the optical model

Cited by 7 publications

References 18 publications

Optimization and analysis of neutron distribution on 30 MeV cyclotron-based double layer beam shaping assembly (DLBSA)

Optimization and analysis of neutron distribution on 30 MeV cyclotron-based double layer beam shaping assembly (DLBSA)

Characteristics in Water Phantom of Epithermal Neutron Beam Produced by Double Layer Beam Shaping Assembly

Optimization of double layered beam shaping assembly using genetic algorithm

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