Fission Damage in Calcite and the Dating of Carbonates

Fission damage induced in calcite is shown by etch pits developed with weak acid at the damage sites. The damage can be differentiated from dislocations by annealing. By this method we have observed fossil fission damage in natural samples. Thus, some etch pits previously attributed to dislocations...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1964-04, Vol.144 (3617), p.409-411
Main Authors: Sippel, Robert F., Glover, Everett D.
Format: Article
Language:English
Subjects:
Annealing
Calcite
Electric fields
Etching
Flood damage
Fossils
Magnetic fields
Minerals
Radiation damage
Resins
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Summary:Fission damage induced in calcite is shown by etch pits developed with weak acid at the damage sites. The damage can be differentiated from dislocations by annealing. By this method we have observed fossil fission damage in natural samples. Thus, some etch pits previously attributed to dislocations actually result from such damage. Annealing studies indicate that the damage should persist for about 4 $\times $ 10$^{7}$ years at 50 °C, and direct evidence suggests that the fission damage has persisted for at least 10$^{6}$ years in one specimen.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.144.3617.409