A Touch of Grey - 20-year Restrospective on Radiation

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Extra info for A Touch of Grey - 20-year Restrospective on Radiation Dosimetry [pres. slides]

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This shows that the temperature increase along a charged particle track is enough to melt and expand PMMA plastic! 5-MeV 12C3+ OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY 36 Photomicrograph of Etched CR39 Shows Feature Dependence on Neutron Energy and Incidence OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY 37 Fluorescence Induced by 2-Photon ‘Pumping’ at Intersection of Crossed Laser Beams in AnthraceneDoped PMMA 50 microns 1064 nm 532nm OAK RIDGE NATIONAL LABORATORY U. S.

DEPARTMENT OF ENERGY 33 Optical Memory Material Response to Neutrons and Charged Particles • • • • • • • Doped Optical Random Access Memory (ORAM) material responds quantitatively to energetic neutrons & charged particles. Mean and variance of penetration depth are functions of particle type & energy. The number of state changes (fluorescence intensity) is a function of dose unique for each radiation type. Response is reversible – the sensor can be re-used. Locations of state changes in the sensor can be determined by 2photon excitation for track reconstruction and spectrometry.

Response is reversible – the sensor can be re-used. Locations of state changes in the sensor can be determined by 2photon excitation for track reconstruction and spectrometry. Surface features in CR39 exposed to neutrons also appear to be energy-dependent. We are now investigating the utility of high-resolution surface imaging of ORAM for determining the neutron spectrum and identifying the source material. OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY 34 S1 532 nm hν 1 532 nm hν 1 S0 Dimeric Form (Non-fluorescent) S2 1064 nm hν 1 532 nm S1 hν 2 S0 Monomeric Form (Fluorescent) Anthracene is a stable dopant that responds reversibly to neutrons.

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