Experimental and calculated neutron spectra at the Finnish epithermal BNCT facility

Serén,; Auterinen,; Seppälä,; Lampinen,; Kotiluoto, Petri; Kortesniemi,; Savolainen,

doi:10.1046/j.1365-2281.1998.00061.x

Cited by 1 publication

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“…Albeit the MCNP5 code should provide accurate neutron calculation results also on the phantom surface, our MCNP5 calculations of Au-RR and Mn-RR differ from the measured more on the surface than at the deeper depths. The results with an ASD of 0 cm shows the known fact published by Serén et al (1999) that the FiR 1 beam model underestimates the number of thermal neutrons (at ∼0.01 eV-5 eV) (underestimation of Mn-RR) and overestimates the number of epithermal neutrons (at ∼5 ev-100 eV) (overestimation of Au-RR). However, since the thermal neutrons are absorbed and epithermal neutrons slow down to the thermal energies quickly in the phantom, the calculation accuracy is better at the deeper depths and the normalized beam model can be considered accurate for the clinical dose calculations.…”

Section: Reaction Ratessupporting

confidence: 57%

Validation of dose planning calculations for boron neutron capture therapy using cylindrical and anthropomorphic phantoms

et al. 2010

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In this paper, the accuracy of dose planning calculations for boron neutron capture therapy (BNCT) of brain and head and neck cancer was studied at the FiR 1 epithermal neutron beam. A cylindrical water phantom and an anthropomorphic head phantom were applied with two beam aperture-to-surface distances (ASD). The calculations using the simulation environment for radiation application (SERA) treatment planning system were compared to neutron activation measurements with Au and Mn foils, photon dose measurements with an ionization chamber and the reference simulations with the MCNP5 code. Photon dose calculations using SERA differ from the ionization chamber measurements by 2-13% (disagreement increased along the depth in the phantom), but are in agreement with the MCNP5 calculations within 2%. The (55)Mn(n,gamma) and (197)Au(n,gamma) reaction rates calculated using SERA agree within 10% and 8%, respectively, with the measurements and within 5% with the MCNP5 calculations at depths >0.5 cm from the phantom surface. The (55)Mn(n,gamma) reaction rate represents the nitrogen and boron depth dose within 1%. Discrepancy in the SERA fast neutron dose calculation (of up to 37%) is corrected if the biased fast neutron dose calculation option is not applied. Reduced voxel cell size (6 cm from the phantom surface. Increasing discrepancy along the phantom depth is expected to be caused by the inaccurately determined effective point of the ionization chamber.

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Section: Reaction Ratessupporting

confidence: 57%