Lineal energy spectra measured with the A-150 TEPC using a simulated site diameter of 1 μm in the (a) unmoderated and (b) moderated FNT beams at a depth of 2.5 cm in water separated into their respective gamma and neutron components.
Changes in the moderated BNCEFNT beam spectrum as a function of depth as measured using the the A-150 TEPC.
Lineal energy spectra measured with the A-150 and -loaded A-150 TEPCs in the moderated beam at a depth of 2.5 cm in water using a simulated site diameter of 1 μm.
Thermal neutron fluence as a function of depth in water in the moderated beam. The point measurements were obtained from TEPC measurements, while the paired Mg ionization chambers were used to obtain the scanned data.
Crossplane profile of relative thermal neutron fluence in the moderated beam using a field size at a depth of 5 cm in water.
Neutron components of the lineal energy spectra measured at a depth of 2.5 cm in water in both the moderated BNECFNT beam and unmoderated clinical fast neutron beam using a simulated site diameter of 1 μm. Also shown in the biological weighting function developed by Loncol et al. (Ref. 49).
RBE-weighted absorbed doses in cGy per monitor unit extracted from the TEPC measurements shown in Fig. 2 (The current configuration allows delivery of approximately 40 MU∕min.) Boron-10 concentrations of 15 and 55 μg∕g were assumed for normal brain and tumor, respectively. RBE values of 1 and 3.2 are used for the gamma and neutron components, and cRBE values of 1.35 and 3.8 are used for the BNC components in normal brain and tumor, respectively.
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