Interdisciplinary ESR from Earth to Planetary Science: Dating and Radiation Dosimetry Motoji Ikeya Inter-nanoscience COE Program, Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1Mihogaoka, Ibaraki, Osaka 567-0047, Japan Interdisciplinary involvements of electron spin resonance (ESR) in geology and planetary sciences and in radiation dosimetry in these three decades are reviewed briefly. Studies on future ESR dating of ices in planetary surveys and natural magnetic resonance of seismo-electromagnetic signals (SEMS) are also presented in this talk. ESR dating of a stalactite at the Akiyoshi Cave (1975) based on the detection of unpaired electron generated by natural radiation has been extended to dating of fossils and minerals in geology and archaeology (anthropology)[1]. Studies on Antarctic carbonate and radiolysis of ices will be discussed in addition to the study of natural and synthetic methane hydrate. Radiolysis of ices with methane and MgSO 4 were studied by simulating ices on Titan and Europe, satellites of Saturn and Jupiter, in addition to that of ices (H 2 O, CO 2 , CH 4 ) for future ESR dating of icy bodies in our solar system. ESR dosimetry of A-bomb radiation (1984) using human tooth enamel has been extended to dosimetry of radiation at Chernobyl and JCO criticality accidents. Compounds of Li- organic acids such as Li-oxalate are developed as tissue-equivalent sensitive dosimeters. Scanning ESR imaging microscope [1] is commercially available for studying the distribution of paramagnetic impurities, radiation dose and dangling bonds (Si wafer). Natural magnetic resonance of protons and paramagnetic impurities and defects under the Earth’s magnetic field of 40-50 μT is speculated considering an earth-crust waveguide and a dielectric cavity (ε* = 10 7 at 1 Hz) of a tectonic plate surrounded by the conductive mantle and plate boundaries (faults). A scaling model experiment on the propagation of SEMS at ultra low frequency (ULF) was made using microwaves as in Fig.2 considering the scaling factor in Maxwell equations: Unusual animal behaviour before earthquakes in legends was ascribed to be caused by SEMS in the book in Fig.3. Fig.1 A book with references Fig.2 SEMS propagated in earth Fig.3 SEMS surprise animals updated in 2002 (2 nd print). crust and natural resonance. before earthquakes. [1] M. Ikeya, New Applications of Electron Spin Resonance – Dating Dosimetry and Microscopy (World Scientific, 2002). [2] M. Ikeya, Earthquakes and Animals (World Scientific, 2004).

Interdisciplinary ESR from Earth to Planetary Science ...esr-group.org/old/conferences/Bath/pdf/Ikeya.pdf · crust and natural resonance. before earthquakes. [1] M. Ikeya, New Applications

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Interdisciplinary ESR from Earth to Planetary Science:

Dating and Radiation Dosimetry

Motoji IkeyaInter-nanoscience COE Program, Institute of Scientific and Industrial Research (ISIR),

Osaka University, 8-1Mihogaoka, Ibaraki, Osaka 567-0047, Japan

Interdisciplinary involvements of electron spin resonance (ESR) in geology andplanetary sciences and in radiation dosimetry in these three decades are reviewed briefly.Studies on future ESR dating of ices in planetary surveys and natural magneticresonance of seismo-electromagnetic signals (SEMS) are also presented in this talk.ESR dating of a stalactite at the Akiyoshi Cave (1975) based on the detection of unpairedelectron generated by natural radiation has been extended to dating of fossils andminerals in geology and archaeology (anthropology)[1]. Studies on Antarctic carbonateand radiolysis of ices will be discussed in addition to the study of natural and syntheticmethane hydrate. Radiolysis of ices with methane and MgSO4 were studied bysimulating ices on Titan and Europe, satellites of Saturn and Jupiter, in addition to thatof ices (H2O, CO2, CH4) for future ESR dating of icy bodies in our solar system.ESR dosimetry of A-bomb radiation (1984) using human tooth enamel has been extendedto dosimetry of radiation at Chernobyl and JCO criticality accidents. Compounds of Li-organic acids such as Li-oxalate are developed as tissue-equivalent sensitive dosimeters.Scanning ESR imaging microscope [1] is commercially available for studying thedistribution of paramagnetic impurities, radiation dose and dangling bonds (Si wafer).Natural magnetic resonance of protons and paramagnetic impurities and defects underthe Earth’s magnetic field of 40-50 µT is speculated considering an earth-crustwaveguide and a dielectric cavity (ε* = 107 at 1 Hz) of a tectonic plate surrounded by theconductive mantle and plate boundaries (faults). A scaling model experiment on thepropagation of SEMS at ultra low frequency (ULF) was made using microwaves as inFig.2 considering the scaling factor in Maxwell equations: Unusual animal behaviourbefore earthquakes in legends was ascribed to be caused by SEMS in the book in Fig.3.

Fig.1 A book with references Fig.2 SEMS propagated in earth Fig.3 SEMS surprise animals updated in 2002 (2nd print). crust and natural resonance. before earthquakes.

[1] M. Ikeya, New Applications of Electron Spin Resonance – Dating Dosimetry and Microscopy(World Scientific, 2002). [2] M. Ikeya, Earthquakes and Animals (World Scientific, 2004).