单能窄束γ射线法检测U_3Si_2-Al燃料元件U_3Si_2均匀性  

Single Narrow γ-Ray Detecting U_3Si_2-Al Nuclear Fuel Element U_3Si_2 Uniformity

作　　者：罗建东[1] 唐月明[2] 许贵平[1] 王学权[1] 都宇[1] 杨力[1] 

机构地区：[1]中国核动力研究设计院核燃料元件及材料研究所,成都610213 [2]中国核动力研究设计院反应堆工程研究所,成都610213

出　　处：《核电子学与探测技术》2016年第3期237-240,共4页Nuclear Electronics & Detection Technology

摘　　要：为进一步提高U3Si2-Al燃料元件U3Si2均匀性检测结果的可靠性,文章建立了一种检测U3Si2-Al燃料元件U3Si2均匀性的"单能窄束γ射线法"。该方法利用γ谱仪测量241Am的59.5 ke Vγ射线穿透燃料元件前后的透射强度,再根据物质的γ射线吸收公式和单次测量区域内U3Si2、Al总体积恒定的特性建立方程组,求解方程组得出U3Si2、Al各自的体积百分数进而得出分布均匀性。文章利用MCNP法和实测法对该检测方法进行了验证,结果表明:该方法具有工程可行性且实验检测相对精度达到3.99%。该方法为燃料元件燃料均匀性检测提供了一种新思路。In order to improve the reliability of detection results, paper establishes a single narrow 3, - ray meth- od for detecting the U3Si2 uniformity of U3Si2-Al nuclear fuel element. The 59.5 keV 3, - ray radiated by 241 Am is used for detection. The method uses Y- ray detector to detect the Y- ray intensity before and after transmitted the fuel element, and then establishes equations based on Y- ray attenuation formula and the char- acteristics of U3Si2 and A1 total volume constant. The volume fraction of U3Si2 and A1 can be got by solving the equations, simultaneously. Paper verifies the method by MCNP simulation and experiment, the verification re- sults showed that the relative accuracy of the method is better than 3.99%. The success investigation of this new method, provide a new idea for nuclear material uniformity detection of fuel element.

关 键 词：U3Si2-Al燃料元件 均匀性 窄束Y射线 MCNP法 

分 类 号：TL81[核科学技术—核技术及应用]