National Technology & Engineering Solutions of Sandia, LLC

Jeffrey B Martin

Richard Karl Harrison

David W Peters

Thomas Edwin Beechem, Iii

Stephen Wayne Howell

Brian Zahler Bentz

Isaac Ruiz

Benjamin Tong Yee

Christopher Blair Saltonstall, Jr

Christopher Murzyn

Norman Kolb

Oskar Fick Searfus

Sean Donovan Fournier

A two-dimensional imaging system and a two-dimensional or three-dimensional optical tomographic mapping system, each employing gas scintillation induced by ionizing radiation, i.e., radioluminescence, and corresponding methods, are disclosed. The systems may employ one or more cameras and corresponding UV filters (potentially solar blind filters) for imaging a radioluminescent scene. For two-dimensional or three-dimensional mapping, the resultant UV images are spatially registered with one another and then reconstructed to form a three-dimensional tomographic map of the ionizing radiation. The two-dimensional map is a plane of the three-dimensional map. The UV images may be spatially registered by using a reference source, optionally, a calibrated reference source allowing dosimetry calculations for the ionizing radiation. Molecular nitrogen is the primary candidate for the radioluminescent gas, though a controlled ambient in a chamber of nitric oxide, argon, krypton, or xenon may be employed. The reconstruction process employs an algebraic reconstruction technique or an Abel inversion.

Mapping and imaging ionizing radiation in two and three dimensions

A radiation field is detected or imaged using one or more junction devices in which a two-dimensional conductor layer is capacitively coupled to a semiconductor absorber layer. In the junction devices, pixel-level amplification and read-out are accomplished through the photogating of the devices by absorption within the absorber layer while it is in a state of deep depletion. When the two-dimensional conductor is graphene, we refer to a device operating in that manner as a deeply depleted graphene-oxide-semiconductor (DGOS) detector.

Radiation detector using a graphene amplifier layer

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Albuquerque, NM, United States of America

Jeffrey B Martin