汤森系数与涂硼正比计数管中气体放大的关系研究  

Study of the Relationship between Townsend Coefficient and the Gas Amplification in Boron-Lined Proportional Counters (BLPCs)

作　　者：陈国云[1] 辛勇[1] 赵书毅 黄福成[1] 

机构地区：[1]南昌大学物理系,南昌

出　　处：《核科学与技术》2014年第4期59-66,共8页Nuclear Science and Technology

基　　金：国家自然科学基金资助项目(41064002)。

摘　　要：基于正比计数管的气体放大,提出四个约化量:约化汤森系数αre、约化倍增因子Mre、临界约化电场ε0、临界约化汤森系数Σ,并得出对应于线性、幂指数和自然指数αre-ε关系的约化倍增因子表达式。以P10气体充入特定涂硼正比管为例,做出了三类关系的约化倍增因子Mre-εa曲线。分析表明描述约化汤森系数、约化倍增因子和约化电场之间的三类关系具有良好的统一性。正比管中存在临界约化电场和临界约化汤森系数,其取值因αre-ε关系而异。正比管中约化倍增因子随阳极丝表面电场递增,其增速受αre-ε关系的影响,但倍增因子取值变化很小。Based on the gas amplification in proportional counters, four reduced quantities: reduced Town-send coefficient αre, reduced multiplication factor Mre, reduced critical electric field ε0, and reduced critical Townsend coefficient Σ are proposed. Expressions of Mre, which are corresponding to linear, exponential and natural exponential relationship of αre vs. ε, are deduced. By taking example for a special boron-lined proportional counter (BLPC) filled with P10 gas, Mre-εa curves based on three kinds of mentioned relationships are plotted. Analysis shows that reduced Townsend coefficient αre , reduced multiplication factor Mre , and reduced electric field ε have good uniformities. Critical reduced electric field and critical reduced Townsend efficiency exist in the operation of PCs, but their values varies with the relationship of αre-ε. Reduced multiplication factors of PCs increase with the electric field on the surface of the anode wire, and the increase rate would be affected by the relationship of αre-ε while the value of Mre changes little.

关 键 词：正比计数管 约化汤森系数 约化倍增因子 约化电场 

分 类 号：F2[经济管理—国民经济]