One-sided imaging of large, dense objects using 511-keV photons from induced-pair production

This work investigates the use of annihilation photons from gamma-ray-induced electron-positron pair production to inspect objects when only one side is accessible. The Z/sup 2/-dependence of the pair-production cross section and the high penetration of 511-keV photons allow this method to differentiate high-Z materials in low-Z matrices. The experimental results for the dependence of the back-streaming photon yield on Z shows a factor of 20 increase for elements over the range 4

Keywords:

• Nuclear magnetic resonance
• Pair production
• Annihilation
• Electron pair
• Experimental data
• Atomic physics
• Optics
• Physics
• Monte Carlo method
• Electron
• Gamma ray
• Photon
• Particle detector
• Nuclear physics

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