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Title: Radiation damage and annealing in plutonium tetrafluoride

Abstract

Plutonium tetrafluoride that was separated prior to 1966 at the Hanford Site in Washington State was analyzed at the Pacific Northwest National Laboratory (PNNL) in 2015 and 2016. The plutonium tetrafluoride, as received, was an off-normal color and considering the age of the plutonium, there were questions about the condition of the material. These questions had to be answered in order to determine the suitability of the material for future use or long-term storage. Therefore, Thermogravimetric/Differential Thermal Analysis and X-ray Diffraction evaluations were conducted to determine the plutonium’s crystal structure, oxide content, and moisture content; these analyses reported that the plutonium was predominately amorphous and tetrafluoride, with an oxide content near ten percent. Freshly fluorinated plutonium tetrafluoride is known to be monoclinic. During the initial Thermogravimetric/Differential Thermal analyses, it was discovered that an exothermic event occurred within the material near 414°C. X-ray Diffraction analyses were conducted on the annealed tetrafluoride. The X-ray Diffraction analyses indicated that some degree of recrystallization occurred in conjunction with the 414°C event. The following commentary describes the series of Thermogravimetric/Differential Thermal and X-ray Diffraction analyses that were conducted as part of this investigation at PNNL, in collaboration with the University of Utah Nuclear Engineering Program.

Authors:
; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1421351
Report Number(s):
PNNL-SA-122738
Journal ID: ISSN 0022-3115
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 496; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

McCoy, Kaylyn, Casella, Amanda, Sinkov, Sergey, Sweet, Lucas, McNamara, Bruce, Delegard, Calvin, and Jevremovic, Tatjana. Radiation damage and annealing in plutonium tetrafluoride. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.08.005.
McCoy, Kaylyn, Casella, Amanda, Sinkov, Sergey, Sweet, Lucas, McNamara, Bruce, Delegard, Calvin, & Jevremovic, Tatjana. Radiation damage and annealing in plutonium tetrafluoride. United States. doi:10.1016/j.jnucmat.2017.08.005.
McCoy, Kaylyn, Casella, Amanda, Sinkov, Sergey, Sweet, Lucas, McNamara, Bruce, Delegard, Calvin, and Jevremovic, Tatjana. Fri . "Radiation damage and annealing in plutonium tetrafluoride". United States. doi:10.1016/j.jnucmat.2017.08.005.
@article{osti_1421351,
title = {Radiation damage and annealing in plutonium tetrafluoride},
author = {McCoy, Kaylyn and Casella, Amanda and Sinkov, Sergey and Sweet, Lucas and McNamara, Bruce and Delegard, Calvin and Jevremovic, Tatjana},
abstractNote = {Plutonium tetrafluoride that was separated prior to 1966 at the Hanford Site in Washington State was analyzed at the Pacific Northwest National Laboratory (PNNL) in 2015 and 2016. The plutonium tetrafluoride, as received, was an off-normal color and considering the age of the plutonium, there were questions about the condition of the material. These questions had to be answered in order to determine the suitability of the material for future use or long-term storage. Therefore, Thermogravimetric/Differential Thermal Analysis and X-ray Diffraction evaluations were conducted to determine the plutonium’s crystal structure, oxide content, and moisture content; these analyses reported that the plutonium was predominately amorphous and tetrafluoride, with an oxide content near ten percent. Freshly fluorinated plutonium tetrafluoride is known to be monoclinic. During the initial Thermogravimetric/Differential Thermal analyses, it was discovered that an exothermic event occurred within the material near 414°C. X-ray Diffraction analyses were conducted on the annealed tetrafluoride. The X-ray Diffraction analyses indicated that some degree of recrystallization occurred in conjunction with the 414°C event. The following commentary describes the series of Thermogravimetric/Differential Thermal and X-ray Diffraction analyses that were conducted as part of this investigation at PNNL, in collaboration with the University of Utah Nuclear Engineering Program.},
doi = {10.1016/j.jnucmat.2017.08.005},
journal = {Journal of Nuclear Materials},
number = C,
volume = 496,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}