公开(公告)号：US5703371A

公开(公告)日：1997-12-30

申请号：US689565

申请日：1996-08-12

申请人： David Michael Farkas ,  Daniel Reese Lutz

发明人： David Michael Farkas ,  Daniel Reese Lutz

IPC分类号： G01N23/05 ,  G01N23/204 ,  G01N23/202

CPC分类号： G01N23/05

摘要： A neutron radiography camera operates in cooperation with a neutron beam source for determining hydrogen content of irradiated BWR fuel elements. The camera implements the method using a notched neutron spectrum filter to determine the hydrogen content. The camera is specifically configured to take advantage of the tubular geometry of a nuclear fuel rod. Incident neutron beam ports are formed in a base unit that receives an incident filtered neutron beam. The ports aim the neutron beam at a periphery of the BWR fuel elements, which in the context of nuclear fuel rods includes zirconium alloy cladding. Collision of the neutrons with hydrogen in the cladding lowers their energy and scatters them at preferential angles. Scatter cavities defining scattered neutron paths are formed in the base unit, and absorber plates are disposed of terminal ends of the scatter cavities. The absorber plates become activated by resonance absorption from the neutrons scattered by hydrogen in the target fuel elements. The hydrogen content can be determined from the activated absorber plates.

摘要翻译： 中子射线摄影照相机与中子束源协同工作，以确定照射的BWR燃料元件的氢含量。 相机使用缺口中子频谱滤波器来实现该方法来确定氢含量。 相机被特别地配置成利用核燃料棒的管状几何形状。 事件中子束端口形成在接收入射过滤的中子束的基本单元中。 这些端口将中子束瞄准BWR燃料元件的周边，在核燃料棒的上下文中包括锆合金包层。 包层中的中子与氢的碰撞降低了它们的能量，并以优先的角度散射它​​们。 形成分散中子路径的散射腔形成在基座单元中，并且吸收板设置在散射空腔的末端。 吸收板通过来自目标燃料元件中由氢分散的中子的共振吸收而激活。 可以从活化的吸收板确定氢含量。