一、基本原理自六十年代中期以来,中子活化瞬发γ射线元素分析技术(PNAA)得到人们广泛重视。与通常的中子活化分析(NAA)技术相比,它分析的是样品中的主要成分,若用同位素中子源,还可进行实时在线连续测定及现场分析。PNAA技术是用热中子与待测元素发生中子俘获反应,处于激发态的产物核在瞬间 First, the basic principles Since the mid-sixties, neutron activation instantaneous gamma ray elemental analysis (PNAA) has been widely valued. Compared with the usual neutron activation analysis (NAA) technology, it analyzes the main components in the sample, and if using isotope neutron sources, it can perform real-time on-line continuous measurement and field analysis. PNAA technology is a neutron capture reaction with the thermal neutron and the element under test, the product nucleus in an excited state in an instant