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首页> 外文期刊>Quantum Beam Science >Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications
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Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

机译：中子射线照相（NRAD）反应器东梁在反应器修改后中子梁表征

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The Neutron Radiography Reactor at Idaho National Laboratory (INL) has two beamlines extending radially outward from the east and north faces of the reactor core. The control rod withdrawal procedure has recently been altered, potentially changing power distribution of the reactor and thus the properties of the neutron beams, calling for characterization of the neutron beams. The characterization of the East Radiography Station involved experiments used to measure the following characteristics: Neutron flux, neutron beam uniformity, cadmium ratio, image quality, and the neutron energy spectrum. The ERS is a Category-I neutron radiography facility signifying it has the highest possible rank a radiography station can achieve. The thermal equivalent neutron flux was measured using gold foil activation and determined to be 9.61 × 106 ± 2.47 × 105 n/cm2-s with a relatively uniform profile across the image plane. The cadmium ratio measurement was performed using bare and cadmium-covered gold foils and measured to be 2.05 ± 2.9%, indicating large epithermal and fast neutron content in the beam. The neutron energy spectrum was measured using foil activation coupled with unfolding algorithms provided by the software package Unfolding with MAXED and GRAVEL (UMG). The Monte-Carlo N-Particle (MCNP6) transport code was used to assist with the unfolding process. UMG, MCNP6, and measured foil activities were used to determine a neutron energy spectrum which was implemented into the MCNP6 model of the east neutron beam to contribute to future studies.
机译：爱达荷国家实验室（INL）的中子造影反应器有两个波束线从反应器核心的东部和北面径向向外延伸。最近已经改变了控制杆提取过程，可能改变反应器的功率分布，从而改变了中子束的性质，呼吁表征中子束。东部射线照相站的表征涉及用于测量以下特征的实验：中子磁通，中子束均匀性，镉比，图像质量和中子能谱。 ERS是一种类别 - 中子放射线摄影设施，表示它具有最高级别的射线照相站可以实现。使用金箔活化测量热量等效中子磁通，并测量为9.61×106±2.47×105n / cm2-s，在图像平面上具有相对均匀的曲线。使用裸露的镉覆盖的金箔进行镉比测量，并测量为2.05±2.9％，表明梁中的大曲线和快中子含量。使用箔激活测量中子能量谱，耦合与由最大和砾石（UMG）展开的软件包提供的软件包提供的展开算法。 Monte-Carlo n粒子（MCNP6）传输代码用于帮助展开过程。 UMG，MCNP6和测量的箔活性用于确定中子能谱，该节能被实施在东方中子梁的MCNP6模型中，以有助于未来的研究。

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