Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)
- Volume 6 Issue 2
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- Pages.84-88
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- 2002
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- 1226-6531(pISSN)
ESR dosimetry and Dating toward $21^{st}$ Century
- Ikeya, Motoji (Department of Earth and Space Science, Graduate School of Science, Osaka University)
- Published : 2002.12.20
Abstract
Dating and dosimetry using electron spin resonance (ESR) in 20th Century developed at both Yamaguchi University and Osaka University have been reviewed with emphasis on new prospects and strategies in 21th century. Natural radiation have been generating radicals that accumulated in archaeological and geological materials. ESR detects these radicals and the ESR signal intensity is proportional to the radiation dose and therefore the age. The assessment of the total dose of natural radiation and the annual dose rate give their ESR ages. The ESR dating of stalactites and stalagmites ant Akiyoshi cave in Yamaguchi prefecture in 1975 was extended to anthropological dating using bones and tooth enamel excavated in Greek Petralona cave. Fossils of shells and corals gave the ages of marine terraces and sea-level changes. Quartz grains gave the ages of geothermal alteration and fault movements. Future ESR dating of ices at outer planets anf their satellite are also investigated as basic studies for ices od
Keywords
- ESR;
- dating;
- radiation;
- dosimetry;
- accident;
- fossil;
- carbonate;
- apatite;
- silica;
- tooth;
- bone;
- MRI;
- CVD;
- scanning;
- microscope