用于中子单色器镶嵌分布测量的γ衍射源设计  

Design of γ Diffraction Source Used for Measurement of Mosaic Structure of Neutron Monochromator

作　　者：姚振强[1] 徐家云[1] 杨尊勇[1] 姚茂莹[1] 王明秋[1] 

机构地区：[1]四川大学物理科学与技术学院,四川成都610064

出　　处：《原子能科学技术》2010年第8期902-905,共4页Atomic Energy Science and Technology

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(10476017)

摘　　要：用γ衍射法测量中子单色器镶嵌角分布,要求γ入射束具有强度大、单能性好、发散度小等特点。为了满足上述要求,须对γ射线源(金材料)的形状和尺寸进行设计。本工作通过分析束流强度、束流发散度与束斑形状的关系,给出了金材料的矩形设计方案;通过蒙特卡罗计算,分析γ自吸收和γ康普顿散射在不同厚度下分别对束流密度和单能性的影响,给出矩形金材料在x、y、z3个方向的尺寸分别为0.6、6和10mm。用所设计的金材料制成γ源,成功实现了用γ衍射法对Ge单晶中子单色器镶嵌分布的测量。Measurement of the mosaic structure for neutron monochromator using γ diffraction requires that the incident γ-ray beam has the features of big intensity,good energy uniformity and small angular divergence,so it is an essential procedure to design the shape and size of gold material of γ source.The cuboid shape of gold was chosen by analysis of the relationships between the intensity,divergence of the γ beam and the beam profile shape.The cuboid gold sizes in three directions were optimized as 0.6,6 and 10 mm,respectively by analyzing the effect of γ-ray attenuation in gold on the beam intensity,and the effect of γ scattering in gold on the energy uniformity.Using the γ source of the cuboid gold material designed,the Ge crystal mosaic of neutron monochromator was measured successfully by the method of γ diffraction.

关 键 词：中子单色器 198Auγ衍射源 放射源金材料设计 

分 类 号：O571.56[理学—粒子物理与原子核物理]