Transcription of Gamma Ray Spectrometry Final - CNSTN
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Gamma Ray Spectrometry Final - CNSTN
1 Gamma Ray Spectrometry Practical Information Document compiled by: Nafaa Reguigui September 2006. 2 Gamma Ray Spectrometry 1. OBJECTIVES 2. introduction 3. INSTRUMENTATION BASICS Nuclear instrumentation module (NIM) Preamplifiers High voltage power supply Amplifier Multichannel analyzer (MCA) Analog to digital conversion (ADC) Modular detector electronics Digital signal processing (DSP) 4. THE DETECTOR Germanium detectors Detector efficiency Detector resolution Use of semi-conductor detectors Detector size Photon energy: Casing material: Construction of semi-conductor detectors Liquid nitrogen (LN2) cooled detectors Germanium detectors with inert shields NaI(Tl) scintillation detectors 5. SPECTRUM FORMATION Origin of X and Radiation Photon interaction with matter Photo-electric effect Compton effect Pair production Combined effect Radiation attenuation Pulse height spectrum Energy transferred to the detector Spectrum components Basic Gamma spectroscopy full energy peak (FEP) Compton continuum and Compton edge Other components of spectrum 3 Sum peak Single escape peak Double escape peak Annihilation Peak Influence of the surrounding material on the detector Backscatter peak Characteristic x-rays 6.
5 2. INTRODUCTION Gamma ray spectrometry is an analytical method that allows the identification and quantification of gamma emitting isotopes in a variety of matrices.
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