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Alpha-decay-induced fracturing in zircon - The transition from the crystalline to the metamict stateZonation due to alpha-decay damage in a natural single crystal of zircon from Sri Lanka is discussed. The zones vary in thickness on a scale from one to hundreds of microns. The uranium and thorium concentrations vary from zone to zone such that the alpha decay dose is between 0.2 x 10 to the 16th and 0.8 x 10 to the 16th alpha-events per milligram. The transition from the crystalline to the aperiodic metamict state occurs over this dose range. At doses greater than 0.8 x 10 to the 16th alpha events/mg there is no evidence for long-range order. This type of damage will accumulate in actinide-bearing, ceramic nuclear waste forms. The systematic pattern of fractures would occur in crystalline phases that are zoned with respect to actinide radionuclides.
Document ID
19870058632
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chakoumakos, Bryan C.
(New Mexico Univ. Albuquerque, NM, United States)
Murakami, Takashi
(New Mexico Univ. Albuquerque, NM, United States)
Lumpkin, Gregory R.
(New Mexico Univ. Albuquerque, NM, United States)
Ewing, Rodney C.
(New Mexico, University Albuquerque, NM, United States)
Date Acquired
August 13, 2013
Publication Date
June 19, 1987
Publication Information
Publication: Science
Volume: 236
ISSN: 0036-8075
Subject Category
Geophysics
Accession Number
87A45906
Funding Number(s)
CONTRACT_GRANT: DE-FG04-84ER-45099
Distribution Limits
Public
Copyright
Other

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