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The effect of ionizing radiation on uranophane

Satoshi Utsunomiya, Lu-Min Wang, Matt Douglas, Susan B. Clark and Rodney C. Ewing
The effect of ionizing radiation on uranophane
American Mineralogist (January 2003) 88 (1): 159-166

Abstract

The susceptibility of uranophane, a uranyl sheet silicate, ideally Ca(UO (sub 2) ) (sub 2) (SiO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 5) , to ionizing irradiation has been evaluated by systematic irradiations with 200 keV electrons over the temperature range 94 to 573 K. High-resolution transmission electron microscopy revealed that amorphous domains formed locally, concurrently with a gradual disordering of the entire structure. Amorphization does at room temperature were 1.1X10 (super 10) Gy for Sr-substituted uranophane, and 1.9X10 (super 10) Gy for Eu-Substituted uranophane; thus, there was an increase in amorphization does with increasing average atomic mass. At 573 K, the amorphization does of uranophane was 2.0X10 (super 11) Gy. The temperature dependence of the amorphization does of uranophane has two stages; < or =413 K and >413 K. Based on a defect accumulation model, the effective activation energies for amorphization at each stage are 0.0440 eV and 0.869 eV, respectively. This suggest that the presence of H (sub 2) O (and OH (super -) ) reduce the energy deposition required to cause amorphization. Above 413K, the amorphization does increased due to the absence of H (sub 2) O and OH (super -) and the absence of radiolytic decomposition of H (sub 2) O and OH (super -) .


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 88
Serial Issue: 1
Title: The effect of ionizing radiation on uranophane
Affiliation: University of Michigan, Department of Nuclear Engineering and Radiological Sciences, Ann Arbor, MI, United States
Pages: 159-166
Published: 200301
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 37
Accession Number: 2003-024312
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Washington State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200309
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