Chapter 9. Nuclear Analysis Methods 1. Neutron Activation Analysis 2. Accelerator Mass spectrometry 3. Mossbauer Spectroscopy 4.Ion beam analysis
Chapter 9. Nuclear Analysis Methods 1.Neutron Activation Analysis 2.Accelerator Mass Spectrometry 3.Mössbauer Spectroscopy 4.Ion Beam Analysis
The Neutron activation Analysis Method 中子活化分析 Material Neutron for naa Prompt y rays Source Material radioactive βrays original nuclides y rays Gamma-ray Data analysis and esults reporting spectrometer Block diagrams of the naa method
2 The Neutron Activation Analysis Method Block diagrams of the NAA method Neutron Source Material for NAA radioactive nuclides Prompt g rays b rays Gamma-ray spectrometer Data analysis and results reporting Material original g rays 中子活化分析
Chinese naa facilities China Institute of Atomic Energy中国原子能科学研究院 Institute of High Energy physics, Chinese academy of Science f 国科学院高能物理研究所
3 Chinese NAA Facilities China Institute of Atomic Energy 中国原子能科学研究院 Institute of High Energy Physics, Chinese Academy of Science中 国科学院高能物理研究所 …
What is NAA? Hit source with neutrons The activity a of the sample A=in(t =doN(I-e)increases with bombarding time t Sources become radioactive Then decay in predictable ways Prompt Beta Gamma Ray Incident radioactive Product Compound
What is NAA? • Hit source with neutrons • Sources become radioactive • Then decay in predictable ways The activity A of the sample increases with bombarding time t
R=,A=8l,noo(l-eve R= measured gamma-ray count rate(cps) A=absolute activity of isotope A+1 Z in sample 8=absolute detector efficiency absolute gamma-ray abundance n=number of atoms of isotope Z in sample o=neutron flux(neutrons cm. sec 0= neutron capture cross section(cm)for Isotope 2=radioactive decay constant(s) for isotope A+1 - irradiation time(s) td=decay time(s) 10Ag+n→Ag 1Ag→6+lCd+y(658keV