High-energy neutrons up to 230 MeV are generated as a consequence of (p,n) nuclear reactions in proton therapy facilities. The aim of this work is to evaluate the potential extension of the UPM Bonner Sphere Spectrometer (BSS) through the use of spallation materials, for its future application to determine neutron fluence spectra in such facilities. Monte Carlo methods have been used to model the response of the actual and modified spheres with the introduction of a spallation material layer, lead or copper, analyzing their response functions. An analysis is also made of the neutron fluence spectra over the ⁶LiI(Eu) scintillator volume and the uncertainty that can be associated to the response functions at high energies as a consequence of the different physics models that can be applied for their analysis.

质子治疗设施中的（p，n）核反应可产生高达230 MeV的高能中子。这项工作的目的是通过使用散裂材料来评估UPM Bonner球形光谱仪（BSS）的潜在扩展，以便将来用于确定此类设施中的中子注量光谱。蒙特卡洛方法已被用来模拟实际球体和修改过的球体的响应，并引入了散裂材料层，铅或铜，并分析了它们的响应函数。还分析了⁶ LiI（Eu）闪烁体体积上的中子注量谱以及由于可用于其分析的不同物理模型而可能与高能量响应函数相关的不确定性。