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Title: MOISTURE AND SURFACE AREA MEASUREMENTS OF PLUTONIUM-BEARING OXIDES

Abstract

To ensure safe storage, plutonium-bearing oxides are stabilized at 950 C for at least two hours in an oxidizing atmosphere. Stabilization conditions are expected to decompose organic impurities, convert metals to oxides, and result in moisture content below 0.5 wt%. During stabilization, the specific surface area is reduced, which minimizes readsorption of water onto the oxide surface. Plutonium oxides stabilized according to these criteria were sampled and analyzed to determine moisture content and surface area. In addition, samples were leached in water to identify water-soluble chloride impurity content. Results of these analyses for seven samples showed that the stabilization process produced low moisture materials (< 0.2 wt %) with low surface area ({le} 1 m{sup 2}/g). For relatively pure materials, the amount of water per unit surface area corresponded to 1.5 to 3.5 molecular layers of water. For materials with chloride content > 360 ppm, the calculated amount of water per unit surface area increased with chloride content, indicating hydration of hygroscopic salts present in the impure PuO{sub 2}-containing materials. The low moisture, low surface area materials in this study did not generate detectable hydrogen during storage of four or more years.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
965397
Report Number(s):
WSRC-STI-2008-00119
Journal ID: ISSN 0925-8388; JALCEU; TRN: US200919%%696
DOE Contract Number:  
DE-AC09-08SR22470
Resource Type:
Journal Article
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Name: Journal of Alloys and Compounds; Journal ID: ISSN 0925-8388
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; CHLORIDES; HYDRATION; HYDROGEN; IMPURITIES; MOISTURE; OXIDES; PLUTONIUM OXIDES; SPECIFIC SURFACE AREA; STABILIZATION; STORAGE; SURFACE AREA; WATER

Citation Formats

Crowder, M, Duffey, J, Livingston, R, Scogin, J, Kessinger, G, and Almond, P. MOISTURE AND SURFACE AREA MEASUREMENTS OF PLUTONIUM-BEARING OXIDES. United States: N. p., 2009. Web. doi:10.1016/j.jallcom.2009.09.161.
Crowder, M, Duffey, J, Livingston, R, Scogin, J, Kessinger, G, & Almond, P. MOISTURE AND SURFACE AREA MEASUREMENTS OF PLUTONIUM-BEARING OXIDES. United States. doi:10.1016/j.jallcom.2009.09.161.
Crowder, M, Duffey, J, Livingston, R, Scogin, J, Kessinger, G, and Almond, P. Mon . "MOISTURE AND SURFACE AREA MEASUREMENTS OF PLUTONIUM-BEARING OXIDES". United States. doi:10.1016/j.jallcom.2009.09.161. https://www.osti.gov/servlets/purl/965397.
@article{osti_965397,
title = {MOISTURE AND SURFACE AREA MEASUREMENTS OF PLUTONIUM-BEARING OXIDES},
author = {Crowder, M and Duffey, J and Livingston, R and Scogin, J and Kessinger, G and Almond, P},
abstractNote = {To ensure safe storage, plutonium-bearing oxides are stabilized at 950 C for at least two hours in an oxidizing atmosphere. Stabilization conditions are expected to decompose organic impurities, convert metals to oxides, and result in moisture content below 0.5 wt%. During stabilization, the specific surface area is reduced, which minimizes readsorption of water onto the oxide surface. Plutonium oxides stabilized according to these criteria were sampled and analyzed to determine moisture content and surface area. In addition, samples were leached in water to identify water-soluble chloride impurity content. Results of these analyses for seven samples showed that the stabilization process produced low moisture materials (< 0.2 wt %) with low surface area ({le} 1 m{sup 2}/g). For relatively pure materials, the amount of water per unit surface area corresponded to 1.5 to 3.5 molecular layers of water. For materials with chloride content > 360 ppm, the calculated amount of water per unit surface area increased with chloride content, indicating hydration of hygroscopic salts present in the impure PuO{sub 2}-containing materials. The low moisture, low surface area materials in this study did not generate detectable hydrogen during storage of four or more years.},
doi = {10.1016/j.jallcom.2009.09.161},
journal = {Journal of Alloys and Compounds},
issn = {0925-8388},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {9}
}