中子计测粉煤水分的理论计算  

Theiretical Calculation on Measuring Powder Coal Moisture Using Neutron Gauge

作　　者：刘圣康[1] 丁小平[1] 张邦英[1] 吴德胜[1] 

机构地区：[1]南京大学物理系,江苏南京210093

出　　处：《同位素》2005年第3期157-159,共3页Journal of Isotopes

摘　　要：采用中子扩散理论计算了插入型中子计的粉煤水分响应,该中子计由点中子源(241Am-Be)和面探测器(Li玻璃)组成。粉煤的堆密度iρ随水分体积分数φW的变化呈V字形,在固定的堆积条件下,水分的体积分数响应可用iρ-x修正,x=1.85。修正后的结果表明,短源距时热中子注量密度分布随水分增加而增大,长源距时则相反。当源距为10 cm时,水分响应呈线性,其相关系数为0.999 5,理论计算的水分体积分数准确度为0.08%。The moisture response of the powder coal using an insert-type neutron gauge is calculated with the neutron diffusion theory. The neutron gauge is composed of a point neutron source （^241Am-Be） and a disk type detector （Li glass scintillator）. The packing variety of density ρi for the powder coal with the volume assumes V form. At fixed packing, the moisture response can be revised by ρi^- x, in this text x= 1.85. The calculation results indicate that the thermal neutron flux density increases with the moisture in short source distance and it is contrary in long source distance. When the source distance is 10 cm, the moisture response is linear, and its linear correlation coefficient is 0. 999 5. The accuracy of theoretical moisture is 0.08%.

关 键 词：插入型中子计 粉煤 水分响应 理论计算 

分 类 号：TL816.3[核科学技术—核技术及应用]