Pulse Shape and Signal Processing for Neutron and Gamma Energy Sources

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Presentation transcript:

Pulse Shape and Signal Processing for Neutron and Gamma Energy Sources Nathan Barba Mentor: Dr. Craig Hardgrove Arizona State University Mechanical Engineering Pulse Shape and Signal Processing for Neutron and Gamma Energy Sources

Neutron Spectroscopy Using CLYC Cs2LiYCl6:Ce (CLYC) is an inorganic scintillator that has dual sensitivity to neutron and gamma rays. Scintillation detectors produce light when exposed radiation. The light generated is converted to electrical energy using a photomultiplier tube (PMT). The waveform signals that are output from the PMT are called pulses. The signal from the pulses can be pre-processed using analog and/or digital electronics. Source: Spieler, H., Front-End Electronics and Signal Processing

Applications Radioactive Material Detection Quantitative Analysis Soil composition Oil and Gas Hydrogen Detection Space applications Source: Amptek

Space Based Neutron Detectors LunaH-Map MiniNS Detector Mars Science Laboratory (Curiosity) Dynamic Albedo of Neutrons (DAN) DAWN Mission Gamma Ray and Neutron Detector (GRaND) MiniNS Source: Hardgrove Labs DAN Instrument Source: ROSCOSMOS

CLYC Laboratory Setup Hardgrove Lab Analog Electronics Digital FGPA Source: Potassium Holbert Lab Analog Electronics Digital FGPA Source: Cesium

Signal Processing Hardware Analog Charge Sensitive Preamplifier Gaussian Shaper Analog/Digital Converter (MCA) Outputs: Histogram Digital Analog/Digital Converter (MCA) FPGA and Software Processing Outputs: Raw Waveform Integrals Histogram Pulse Shape Discrimination

Neutron Pulse Processing Software Raw Waveform Convert to Integrals Generate Histogram

Pulse Processing Results 3600 sec experiment control versus potassium chloride salt pellets Green: Potassium (K-40) Red: Background radiation

Acknowledgements Thank you to: Dr. Craig Hardgrove Dr. Tom Sharp and Desiree Crawl Arizona Space Grant Consortium NASA Erik Johnson - Radiation Monitoring Devices (RMD) Dr. Keith Holbert - ASU

Questions?? nathan.barba@asu.edu Thank you! Questions?? nathan.barba@asu.edu