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Journal Articles

spectrometry of terrestrial gamma rays using portable germanium detectors in area of 80 km radius around the Fukushima Daiichi Nuclear Power Plant

Mikami, Satoshi; Tanaka, Hiroyuki*; Okuda, Naotoshi*; Sakamoto, Ryuichi*; Ochi, Kotaro; Uno, Kiichiro*; Matsuda, Norihiro; Saito, Kimiaki

Nihon Genshiryoku Gakkai Wabun Rombunshi, 20(4), p.159 - 178, 2021/12

https://doi.org/10.3327/taesj.J20.010

In order to know the background radiation level where the area affected by the Fukushima Daiichi Nuclear Power Plant accident in 2011, terrestrial gamma rays had been measured by using portable germanium detectors repeatedly from 2013 through 2019, at 370 locations within 80 km radius area centered on the Fukushima Daiichi Nuclear Power Plant. Radioactive concentrations of Uranium 238, Thorium 232, Potassium 40 and kerma rates in air due to terrestrial gamma rays were obtained at those locations based on the method of ICRU report 53. Averaged concentrations of $^{238}$ U, $^{232}$ Th and $^{40}$ K were 18.8, 22.7, 428 Bq/kg, respectively, and kerma rate in air over the area was found to be 0.0402 Gy/h. The obtained kerma rates in air were compared to those reported in literatures. It was confirmed that the data were correlated with each other, and were agreed within the range of their uncertainty. This is because the kerma rate in air due to terrestrial gamma rays is depend on geology. The similar trend to previous findings was observed that the kerma rate in air at locations geologically classified as Mesozoic era, Granite and Rhyolite were statistically significantly higher than the others.

Journal Articles

Direct observation of vortex images on lead micro-hole lattice by SQUID microscope

Ishida, Takekazu*; Yoshida, Masaaki*; Okuda, Kiichi*; Okayasu, Satoru; Sasase, Masato; Hojo, Kiichi; Odawara, Akikazu*; Nagata, Atsushi*; Morooka, Toshimitsu*; Nakayama, Satoshi*; et al.

Physica C, 357-360(Part.1), p.604 - 607, 2001/09

no abstracts in English

Journal Articles

Intrinsic pinning does not influence the vortex melting transition of YBa $_{2}$ Cu $_{3}$ O $_{6.94}$ in Hc configuration

Ishida, Takekazu*; Kitamura, Kentaro*; Okuda, Kiichi*; Asaoka, Hidehito

Journal of the Physical Society of Japan, 70(7), p.2110 - 2113, 2001/07

https://doi.org/10.1143/JPSJ.70.2110

Times Cited Count：3 Percentile：27.22(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Nature of vortex melting transition when the field is perpendicular to the c-axis of untwinned YBa $_{2}$ Cu $_{3}$ O $_{6.94}$

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Physica B; Condensed Matter, 284-288(Part1), p.727 - 728, 2000/07

https://doi.org/10.1016/S0921-4526(99)02425-4

Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Does vortex lattice of YBa $_{2}$ Cu $_{3}$ O $_{6.94}$ in HC melt below intrinsic-pinning irreversibility line?

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Journal of Low Temperature Physics, 117(5-6), p.1387 - 1391, 1999/12

no abstracts in English

Journal Articles

Role of intrinsic pinning for melting transition of YBa $_{2}$ Cu $_{3}$ O $_{6.93}$ in the parallel field to CuO $_{2}$ layers

Ishida, Takekazu*; ; Okuda, Kiichi*; Asaoka, Hidehito; A.I.Rykov*;

Advances in Superconductivity XI, p.469 - 472, 1999/00

no abstracts in English

Journal Articles

Vortex pinning and irreversibility line in single crystal YBa $_{2}$ Cu $_{3}$ O $_{7}$ with parallel twin boundaries

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; Kazumata, Yukio*; Noda, Kenji;

Advances in Superconductivity X, p.461 - 464, 1998/00

https://doi.org/10.1007/978-4-431-66879-4_106

no abstracts in English

Journal Articles

Two- and fourfold ab-plane torque symmetry in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystals

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; Kazumata, Yukio*; Noda, Kenji;

Physical Review B, 56(18), p.11897 - 11902, 1997/11

https://doi.org/10.1103/PhysRevB.56.11897

Times Cited Count：42 Percentile：87.59(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Sequential vortex states upon lattice melting in untwinned single-crystal YBa $_{2}$ Cu $_{3}$ O $_{7}$

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Physical Review B, 56(9), p.5128 - 5131, 1997/09

https://doi.org/10.1103/PhysRevB.56.5128

Times Cited Count：30 Percentile：81.80(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Clear evidence for vortex pinning along twin boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Advances in Superconductivity IX, p.511 - 514, 1997/00

no abstracts in English

Journal Articles

Kim critical state in twinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Mikayama, Takeshi *; Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Advances in Superconductivity VIII, 0, p.571 - 574, 1996/00

no abstracts in English

Journal Articles

Torque magnetometry of twinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Ishida, Takekazu*; Kawamata, Shuichi*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Advances in Superconductivity VIII, 0, p.189 - 192, 1996/00

no abstracts in English

Journal Articles

In-plane torque and gap symmetry of untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ crystals

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Czechoslovak Journal of Physics, 46(SUPPL.S3), p.1217 - 1218, 1996/00

no abstracts in English

Journal Articles

Gap symmetry and intrinsic intraplane pinning of untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystals

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Journal of Low Temperature Physics, 105(5-6), p.1165 - 1170, 1996/00

https://doi.org/10.1007/BF00753857

Times Cited Count：2 Percentile：16.39(Physics, Applied)

no abstracts in English

Journal Articles

Evidence for vortex lattice melting and softening in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Journal of Low Temperature Physics, 105(5-6), p.1171 - 1176, 1996/00

https://doi.org/10.1007/BF00753858

Times Cited Count：3 Percentile：23.11(Physics, Applied)

no abstracts in English

Journal Articles

Anisotropy of superconductivity in an untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Ishida, Takekazu*; Inoue, Kazuo*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Physica C, 263, p.260 - 263, 1996/00

https://doi.org/10.1016/0921-4534(96)00024-X

Times Cited Count：22 Percentile：73.59(Physics, Applied)

no abstracts in English

Journal Articles

A Dual character of twin boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Proc. of 8th Int. Workshop on Critical Currents in Superconductors, 0, p.313 - 316, 1996/00

no abstracts in English

Journal Articles

Irreversibility line of YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal with optimum oxygen stoichiometry

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito; ; Noda, Kenji;

Advances in Superconductivity VII, 0, p.527 - 530, 1995/00

no abstracts in English

Journal Articles

Homogeneity of superconductivity in YBa $_{2}$ Cu $_{3}$ O $_{x}$ single crystals

Asaoka, Hidehito; Ishida, Takekazu*; ; Okuda, Kiichi*; Noda, Kenji;

Japanese Journal of Applied Physics, 33(12A), p.6537 - 6538, 1994/12

https://doi.org/10.1143/JJAP.33.6537

Times Cited Count：1 Percentile：11.15(Physics, Applied)

no abstracts in English

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spectrometry of terrestrial gamma rays using portable germanium detectors in area of 80 km radius around the Fukushima Daiichi Nuclear Power Plant

Direct observation of vortex images on lead micro-hole lattice by SQUID microscope

Intrinsic pinning does not influence the vortex melting transition of YBa $_{2}$ Cu $_{3}$ O $_{6.94}$ in Hc configuration

Nature of vortex melting transition when the field is perpendicular to the c-axis of untwinned YBa $_{2}$ Cu $_{3}$ O $_{6.94}$

Does vortex lattice of YBa $_{2}$ Cu $_{3}$ O $_{6.94}$ in HC melt below intrinsic-pinning irreversibility line?

Role of intrinsic pinning for melting transition of YBa $_{2}$ Cu $_{3}$ O $_{6.93}$ in the parallel field to CuO $_{2}$ layers

Vortex pinning and irreversibility line in single crystal YBa $_{2}$ Cu $_{3}$ O $_{7}$ with parallel twin boundaries

Two- and fourfold ab-plane torque symmetry in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystals

Sequential vortex states upon lattice melting in untwinned single-crystal YBa $_{2}$ Cu $_{3}$ O $_{7}$

Clear evidence for vortex pinning along twin boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Kim critical state in twinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Torque magnetometry of twinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

In-plane torque and gap symmetry of untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ crystals

Gap symmetry and intrinsic intraplane pinning of untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystals

Evidence for vortex lattice melting and softening in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Anisotropy of superconductivity in an untwinned YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

A Dual character of twin boundaries in YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal

Irreversibility line of YBa $_{2}$ Cu $_{3}$ O $_{7}$ single crystal with optimum oxygen stoichiometry

Homogeneity of superconductivity in YBa $_{2}$ Cu $_{3}$ O $_{x}$ single crystals