基于D-Be紧凑型快中子源的中子慢化整形器研究

[Background]: Boron Neutron Capture Therapy (BNCT) is a binary radiation therapy with strong targeting and high energy transfer line density at the cellular scale.It has the advantages of short treatment cycle and minimal damage to surrounding healthy tissues,making it a promising cancer treatment method. [Purpose]: This study aims to design beam shaping assembly(BSA)to make the neutron beam of D-Be neutron source suitable for BNCT and ensure neutron directionality. [Methods]: This article uses Monte Carlo simulation programs GEANT4 and FLUKA to simulate the generation of 9Be(d, n)10B reaction neutron sources and subsequent neutron moderation.A scheme design for BSA was carried out using a 1.45 MeV,30 mA deuterium beam to bombard a 9 μm thin beryllium target,and set a basis BSA model with a cylindrical structure as a whole. [Results]: The results show that using a 20 cm thick BiF3 and 30 cm thick MgF2 combined slowing layer, a 30 cm thick Pb reflector layer, a 9 cm thick MgF2 supplementary slowing layer, and a 0.2 mm thick Cd thermal neutron absorption layer,the outlet is ensured to γ and fast neutron composition,Φepi/Φth, Φepi/Φfast meets the recommended values of the IAEA. [Conclusions]: This study obtained the neutron spectra and BSA specific design scheme of low-energy deuterium beams and thin beryllium targets,providing data reference for the slowing shaping of neutrons in D-Be neutron sources and supporting subsequent research on D-Be sources.

[背景]：硼中子俘获治疗（Boron Neutron Capture Therapy, BNCT）是一种二元放射治疗技术，在细胞尺度下具备极强靶向性与高线性能量转移线密度，兼具治疗周期短、对周围健康组织损伤极小的优势，是极具应用前景的癌症治疗手段。
[目的]：本研究旨在设计束流整形组件（Beam Shaping Assembly, BSA），使D-Be中子源的中子束适配硼中子俘获治疗需求，并保障中子束的方向性。
[方法]：本文采用蒙特卡罗模拟程序GEANT4与FLUKA，对9Be(d, n)10B反应的中子源产生及后续中子慢化过程开展模拟。以1.45 MeV、30 mA的氘束轰击9 μm厚薄铍靶为条件，设计了整体呈圆柱结构的BSA基准模型。
[结果]：研究结果表明，采用20 cm厚BiF3与30 cm厚MgF2组合慢化层、30 cm厚Pb反射层、9 cm厚MgF2补充慢化层以及0.2 mm厚Cd热中子吸收层后，可确保出口中子束的γ射线与快中子成分占比符合要求，且Φepi/Φth、Φepi/Φfast参数符合国际原子能机构（International Atomic Energy Agency, IAEA）的推荐标准。
[结论]：本研究获取了低能氘束与薄铍靶对应的中子能谱及BSA专属设计方案，可为D-Be中子源的中子慢化整形提供数据参考，为后续D-Be源相关研究提供支撑。

搜集汇总

背景与挑战

背景概述

该数据集围绕D-Be紧凑型快中子源的中子慢化整形器研究，通过蒙特卡洛模拟设计了适用于硼中子俘获治疗（BNCT）的束流整形组件。研究结果展示了特定材料组合的中子慢化层结构，使中子束流参数满足国际原子能机构标准，为后续D-Be中子源研究提供了数据支持。