DRSA Inreach
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Transcript of DRSA Inreach
INTRODUCTION TO THE DRSA Inreach - 2012
DRSA Inreach
Internal Stresses in Aluminum Engines Neutrons1Introduction of research projectSolidification of casting alloysStresses and strainsCrystal latticesDiffractionNeutronsExperimental designDataAnalysis of dataMeasuring Residual StressesWavelength about 2 Go through several cm of AlWhat Waves Will We Use
LightWrong wavelength, absorbedX-raysWavelength OK, strongly absorbedElectronsWavelength OK, very strongly absorbed (penetrate less than a mm)NeutronsWavelength OK, able to pass through many cm of AlWe chose neutrons
Possible WavesWhat is a Neutron?Subatomic particleDiscovered in 1932Electrically neutralWith protons, they form nucleiStable in the nucleusUnstable when free, half-life 10 minutes and 11 seconds when free, beta decay (neutron turns into a proton, electron and electron antineutrino)Able to penetrate matter because electrically neutralAbout the same mass as a proton
NRU ReactorWhat makes the Reactor Go?Fuel is metallic composite containing uranium enriched in U235U235 is a fissile isotope of uraniumSo what does fissile mean?
What makes the Reactor Go?So answer the question, what makes the reactor go?A chain reaction
What makes the Reactor Go?Then whats all the water in there for?Neutrons ejected from fission are going too fast for U235 nuclei to capture them.The water slows them down.
McMaster Reactor
MonochromationBraggs Law
ReactorSample
Diffraction
how do we design an experiment using neutronsNext Week