论文部分内容阅读
一种能够早期对金属部件损伤发出报警的无损探伤新装置已经由英国原子能管理局(AEA)开发成功。正电子湮没线型分析(PALA)就是能够发现金属和合金因机械加工或者辐照引起的早期损伤的几种技术之一。正电子湮没γ-射线线型分析是根据正电子与电子碰撞所产生的辐射进行分析。碰撞时电子所处的状态不同,辐射也不同。结合电子(价电子)产生的信号不同于未束缚导电子湮没产生的信号,早期损伤会使金属中的缺陷增加,同时也增加了导电电
A new non-destructive testing device capable of early warning of damage to metal components has been successfully developed by the British Agency for Atomic Energy (AEA). Positron annihilation (PALA) analysis is one of several techniques that can detect early damage to metals and alloys due to mechanical processing or irradiation. Positron annihilation [gamma] -ray ray analysis is based on the analysis of the radiation generated by the positron-electron collisions. When the collision of electrons in different states, radiation is also different. The signals generated by the binding electrons (valence electrons) are different from the signals generated by the unconfined conductor annihilation. Early damage will increase the defects in the metal and also increase the conductivity