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Proceedings Paper

Application of in-situ ion irradiation TEM and 4D tomography to advanced scintillator materials
Author(s): Sarah M. Hoppe; Khalid Hattar; Timothy J. Boyle; Janelle Villone; Pin Yang; F. Patrick Doty; Bernadette A. Hernandez-Sanchez
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Paper Abstract

Scintillating nanomaterials are being investigated as replacements for fragile, difficult to synthesize single crystal radiation detectors, but greater insight into their structural stability when exposed to extreme environments is needed to determine long-term performance. An initial study using high-Z cadmium tungstate (CdWO4) nanorods and an in-situ ion irradiation transmission electron microscope (I3TEM) was performed to determine the feasibility of these extreme environment experiments. The I3TEM presents a unique capability that permits the real time characterization of nanostructures exposed to various types of ion irradiation. In this work, we investigated the structural evolution of CdWO4 nanorods exposed to 50 nA of 3 MeV copper (3+) ions. During the first several minutes of exposure, the nanorods underwent significant structural evolution. This appears to occur in two steps where the nanorods are first segmented into smaller sections followed by the sintering of adjacent particles into larger nanostructures. An additional study combined in-situ ion irradiation with electron tomography to record tilt series after each irradiation dose; which were then processed into 3D reconstructions to show radiation damage to the material over time. Analyses to understand the mechanisms and structure-property relationships involved are ongoing.

Paper Details

Date Published: 19 October 2012
PDF: 7 pages
Proc. SPIE 8509, Penetrating Radiation Systems and Applications XIII, 85090F (19 October 2012); doi: 10.1117/12.929933
Show Author Affiliations
Sarah M. Hoppe, Sandia National Labs. (United States)
Khalid Hattar, Sandia National Labs. (United States)
Timothy J. Boyle, Sandia National Labs. (United States)
Janelle Villone, Sandia National Labs. (United States)
Pin Yang, Sandia National Labs. (United States)
F. Patrick Doty, Sandia National Labs. (United States)
Bernadette A. Hernandez-Sanchez, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 8509:
Penetrating Radiation Systems and Applications XIII
Gary P. Grim; H. Bradford Barber, Editor(s)

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