瞬发伽马活化分析与中子层析照相联合测量技术

摘要

介绍瞬发伽马(中子)活化分析(prompt gamma-ray neutron activation analysis,PGAA/PGNAA)技术的发展应用情况与国际上的最新研究成果.将PGAA与中子层析照相(neutron tomography,NT)技术结合,利用中子层析照相重建结果,得到样品内部三维结构,研究中子束流在样品内部的衰减过程,确定样品内部特定位置处的中子束流强度,获得其强度分布.结合PGAA与NT,可以实现不对样品拆解取样,对其内部元素成分进行三维分布分析.国际上,德国FRMⅡ研究堆与匈牙利布达佩斯研究堆的中子束流上已建成相关装置,并在天文、考古领域得到应用.国内相关研究也相继启动.%Applications and progress of prompt gamma-ray neutron activation analysis (PGAA/PGNAA) were presented.PGAA was combined with neutron tomography (NT),which was used to reconstruct the 3D construction inside a sample and the neutron beam attenuation inside the sample could be estimated.Further more,neutron beam intensity at a specific position also could be evaluated by NT.The combination of PGAA and NT was able to analyse 3D distributions of elements inside samples without being disassembled.The PGAA-NT facilities were built at FRM Ⅱ and Budapest research reactor,which were applied to study astronomy and ancient samples.The PGAA-NT combination technique is being developed in China.