Papers - YAMADA RYOHEI
-
Optimization and validation of combustion-based analysis of organically bound tritium in pine needles
Kuwata, H; Kheamsiri, K; Yamada, R; Tamari, T; Kakiuchi, H; Tanaka, M; Akata, N
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 334 ( 5 ) 3185 - 3192 2025.5
-
Fukushima’s Tap and Groundwater a Decade after the Nuclear Accident with Radiocesium, Tritium, and Radon
Donovan Anderson, Yuki Oda, Yasuyuki Taira, Yasutaka Omori, Hirofumi Tazoe, Naofumi Akata, Chutima Kranrod, Ryohei Yamada, Haruka Kuwata, Yuki Tamakuma, Hiromi Kudo, Minoru Osanai, Natsuki Nishimura, Yumi Yasuoka, Tetsuya Sanada, Masahiro Hosoda, Shinji Tokonami
Environmental Science & Technology 59 ( 10 ) 4906 - 4914 2025.3
-
Structure shielding of school and gymnasium buildings against fallout gamma radiation from the Fukushima Daiichi Nuclear Power Plant accident
Manaya Taoka, Rui Kudo, Ryohei Yamada, Yasutaka Omori, Kazutaka Tanaka, Masahiro Hosoda, Shinji Tokonami
Ecotoxicology and Environmental Safety 288 117394 2024.12
-
Atmospheric concentrations of 7Be and 210Pb in weekly aerosols at Hirosaki, a heavy snowfall area in Japan
Khemruthai Kheamsiri, Oumar Bobbo Modibo, Bagus Sidik Waskito Hadi, Haruka Kuwata, Ryohei Yamada, Chutima Kranrod, Naofumi Akata
Radiation Protection Dosimetry 200 ( 16-18 ) 1782 - 1786 2024.11
-
Tritium determination in natural water samples in Fukushima from 2022 to 2023 using an ultra-low-level tritium counting system
Miklós Hegedűs, Haruka Kuwata, Khemruthai Kheamsiri, Maté Novák, Ryohei Yamada, Naofumi Akata, Tibor Kovács
Radiation Protection Dosimetry 200 ( 16-18 ) 1845 - 1849 2024.11
-
Tritium concentration in monthly precipitation in Okinawa and Kagoshima, southern Japan
Naofumi Akata, Kaho Ohno, Haruka Kuwata, Khemruthai Kheamsiri, Yukiko Yoshinaka, Ryohei Yamada, Yuisa Kitayama, Sana Aizawa, Shunya Nakasone, Akinobu Ishimine, Masahiro Tanaka, Yoshitaka Shiroma, Shinji Tokonami, Masahide Furukawa
Radiation Protection Dosimetry 200 ( 16-18 ) 1792 - 1796 2024.11
-
Evaluation of combustion system for organically bound tritium analysis using dried fish samples
Haruka Kuwata, Ryohei Yamada, Khemruthai Kheamsiri, Hideki Kakiuchi, Toshiya Tamari, Nagayoshi Shima, Naofumi Akata
Radiation Protection Dosimetry 200 ( 16-18 ) 1807 - 1812 2024.11
-
Effect of sampling face velocity on the ultrafine particle surface collection efficiency of a cellulose membrane filter and a cellulose-glass fiber filter for environmental airborne radioactivity monitoring
Mizuki Kiso, Manaya Taoka, Aoi Sampei, Hiroki Hashimoto, Yuki Abe, Yuki Oda, Yasutaka Omori, Ryohei Yamada, Masahiro Hosoda, Chutima Kranrod, Tetsuo Ishikawa, Shinji Tokonami
Radiation Protection Dosimetry 200 ( 16-18 ) 1671 - 1675 2024.11
-
Characteristics of tritium, stable isotopes and chemical components in monthly precipitation at Hiroshima, Japan
Ryohei Yamada, Haruka Kuwata, Khemruthai Kheamsiri, Kaho Ohno, Yuisa Kitayama, Yukiko Yoshinaka, Shinji Yoshinaga, Naoyuki Kurita, Naofumi Akata
Radiation Protection Dosimetry 200 ( 16-18 ) 1797 - 1801 2024.11
-
Behavior of radioactive cesium concentration for 13 years after FDNPP accident at Koriyama campus of Nihon University, Fukushima, Japan
Ryoko Suzuki, Katsuhiko Okuyama, Kohei Chiba, Taiki Hashimoto, Natsumi Katsumata, Azusa Ukitsu, Khemruthai Kheamsiri, Ryohei Yamada, Naofumi Akata
Radiation Protection Dosimetry 200 ( 16-18 ) 1835 - 1839 2024.11
-
Performance Test of Improved Commercially Available Tritium Enrichment System: Toward Rapid and High Efficiency Enrichment
Akata Naofumi, Okada Kazusa, Otashiro Nao, Kuwata Haruka, Kheamsiri Khemruthai, Ohno Kaho, Yoshinaka Yukiko, Yamada Ryohei, Tanaka Masahiro
Radiation Environment and Medicine 13 ( 2 ) 60 - 64 2024.8
-
Tissue-free water tritium and non-exchangeable organically bound tritium concentrations in fish near coastline during and after operation of Japan's first nuclear fuel reprocessing facility
Naofumi Akata, Donovan Anderson, Hideki Kakiuchi, Ryohei Yamada, Hidenao Hasegawa, Shinji Ueda
Science of The Total Environment 947 174404 - 174404 2024.7
-
Tritium concentration in bottled drinking water and internal dose assessment
Khemruthai Kheamsiri, Naofumi Akata, Haruka Kuwata, Masahiro Tanaka, Masahiro Hosoda, Michiya Sasaki, Yoshitaka Shiroma, Shinji Tokonami, Ryohei Yamada, Chutima Kranrod, Kazuki Iwaoka, Tibor Kovάcs
Journal of Radioanalytical and Nuclear Chemistry 333 ( 5 ) 2597 - 2603 2024.5
-
Changes in Particulate Matter (PM2.5 and PM10) Concentrations and Ambient Dose Equivalent Rates at Different Altitudes in Chiang Mai, Thailand
Kranrod Chutima, Thumvijit Tarika, Yamada Ryohei, Poltabtim Worawat, Kiso Mizuki, Sriburee Sompong, Somboon Siriprapa, Ruktinnakorn Kewalin, Tokonami Shinji
Radiation Environment and Medicine 13 ( 1 ) 28 - 34 2024.2
-
Temporal variation of tritium concentration in monthly precipitation collected at a Difficult-to-Return Zone in Namie Town, Fukushima Prefecture, Japan
Ryohei Yamada, Hidenao Hasegawa, Naofumi Akata, Hideki Kakiuchi, Shinya Ochiai, Haruka Kuwata, Khemruthai Kheamsiri, Shinji Tokonami, Shinji Ueda
Environmental Science and Pollution Research 31 ( 5 ) 7818 - 7827 2024.1
-
Calibration experiments for radon in drinking water measurements using portable-type electrostatic-collection radon monitors
Masahiro Hosoda, Yasutaka Omori, Hiroki Hashimoto, Maho Matsumoto, Yumi Yasuoka, Tetsuya Sanada, Yuki Oda, Mizuki Kiso, Aoi Sampei, Chutima Kranrod, Hirofumi Tazoe, Naofumi Akata, Yasuyuki Taira, Yuki Tamakuma, Ryohei Yamada, Hiromi Kudo, Mayumi Shimizu, Shinji Tokonami
Radiation Protection Dosimetry 199 ( 18 ) 2203 - 2206 2023.11
-
Tritium Concentration in Natural Spring Water Collected at Hirosaki, Japan
AKATA Naofumi, OKADA Kazusa, KUWATA Haruka, KHEAMSIRI Khmruthai, HOSODA Masahiro, TAZOE Hirofumi, YASUHARA Ryo, SUGIHARA Shinji, YAMADA Ryohei, TANAKA Masahiro
Plasma and Fusion Research 18 ( 0 ) 2405030 - 2405030 2023.4
-
INFLUENCE OF SAMPLING FLOW RATE ON THORON EXHALATION RATE MEASUREMENTS BY THE CIRCULATION METHOD
Masahiro Hosoda, Ryohei Yamada, Hiromu Kobyashi, Yuki Tamakuma, Eka Djatnika Nugraha, Hiroki Hashimoto, Ryoju Negami, Chutima Kranrod, Yasutaka Omori, Hirofumi Tazoe, Naofumi Akata, Shinji Tokonami
Radiation Protection Dosimetry 198 ( 13-15 ) 904 - 908 2022.9
-
222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake
Ryohei Yamada, Masahiro Hosoda, Tomomi Tabe, Yuki Tamakuma, Takahito Suzuki, Kevin Kelleher, Takakiyo Tsujiguchi, Yoshiki Tateyama, Eka Djatnika Nugraha, Anna Okano, Yuki Narumi, Chutima Kranrod, Hirofumi Tazoe, Kazuki Iwaoka, Yumi Yasuoka, Naofumi Akata, Tetsuya Sanada, Shinji Tokonami
International Journal of Environmental Research and Public Health 19 ( 3 ) 1758 - 1758 2022.2
-
A Preliminary Study of Radon Equilibrium Factor at a Tourist Cave in Okinawa, Japan
Ryohei Yamada, Yuki Tamakuma, Takahito Suzuki, Shunya Nakasone, Yoshitaka Shiroma, Masahide Furukawa, Hiroki Hashimoto, Masahiro Hosoda, Naofumi Akata, Shinji Tokonami
Atmosphere 12 ( 12 ) 1648 - 1648 2021.12
-
Comprehensive exposure assessments from the viewpoint of health in a unique high natural background radiation area, Mamuju, Indonesia
Eka Djatnika Nugraha, Masahiro Hosoda, Kusdiana, Untara, June Mellawati, Nurokhim, Yuki Tamakuma, Abarrul Ikram, Mukh Syaifudin, Ryohei Yamada, Naofumi Akata, Michiya Sasaki, Masahide Furukawa, Shinji Yoshinaga, Masaru Yamaguchi, Tomisato Miura, Ikuo Kashiwakura, Shinji Tokonami
Scientific Reports 11 ( 1 ) 14578 2021.7
-
Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture
Koya Ogura, Masahiro Hosoda, Yuki Tamakuma, Takahito Suzuki, Ryohei Yamada, Ryoju Negami, Takakiyo Tsujiguchi, Masaru Yamaguchi, Yoshitaka Shiroma, Kazuki Iwaoka, Naofumi Akata, Mayumi Shimizu, Ikuo Kashiwakura, Shinji Tokonami
International Journal of Environmental Research and Public Health 18 ( 3 ) 978 - 978 2021.2
-
Long-Term Measurements of Radon and Thoron Exhalation Rates from the Ground Using the Vertical Distributions of Their Activity Concentrations
Oumar Bobbo Modibo, Yuki Tamakuma, Takahito Suzuki, Ryohei Yamada, Weihai Zhuo, Chutima Kranrod, Kazuki Iwaoka, Naofumi Akata, Masahiro Hosoda, Shinji Tokonami
International Journal of Environmental Research and Public Health 18 ( 4 ) 1489 - 1489 2021.2
-
A unique high natural background radiation area – Dose assessment and perspectives
Masahiro Hosoda, Eka Djatnika Nugraha, Naofumi Akata, Ryohei Yamada, Yuki Tamakuma, Michiya Sasaki, Kevin Kelleher, Shinji Yoshinaga, Takahito Suzuki, Chanis Pornnumpa Rattanapongs, Masahide Furukawa, Masaru Yamaguchi, Kazuki Iwaoka, Tetsuya Sanada, Tomisato Miura, Kusdiana, Dadong Iskandar, Eko Pudjadi, Ikuo Kashiwakura, Shinji Tokonami
Science of The Total Environment 750 142346 - 142346 2021.1
-
Environmental Monitoring of <sup>134</sup>Cs and <sup>137</sup>Cs Levels in Namie Town in 2018 and 2019
Hegedűs Miklós, Ploykrathok Thamaborn, Shiroma Yoshitaka, Iwaoka Kazuki, Yamada Ryohei, Tsujiguchi Takakiyo, Yamaguchi Masaru, Suzuki Takahito, Ogura Koya, Tamakuma Yuki, Tazoe Hirofumi, Akata Naofumi, Hosoda Masahiro, Kashiwakura Ikuo, Tokonami Shinji
Radiation Environment and Medicine 9 ( 2 ) 70 - 78 2020.8
-
Lessons From a Japan-Korea Collaboration on Medical Response Training for a Nuclear or Radiological Emergency, Assuming Mass Casualty
Takakiyo Tsujiguchi, Maiko Kitajima, Toshiko Tomisawa, Yuki Shiroto, Ryohei Yamada, Kyoji Saito, Hiroyuki Hanada, Young Woo Jin, Minsu Cho, Seongjae Jang, Hyunjung Kim, Minjung Pak, Toshiya Nakamura
Disaster Medicine and Public Health Preparedness 14 ( 4 ) 431 - 432 2020.8
-
Cesium concentrations in various environmental media at Namie, Fukushima
M. Hegedűs, Y. Shiroma, K. Iwaoka, M. Hosoda, T. Suzuki, Y. Tamakuma, R. Yamada, T. Tsujiguchi, M. Yamaguchi, K. Ogura, H. Tazoe, N. Akata, I. Kashiwakura, S. Tokonami
Journal of Radioanalytical and Nuclear Chemistry 323 ( 1 ) 197 - 204 2020.1
-
COMPARATIVE STUDY ON PERFORMANCE OF VARIOUS ENVIRONMENTAL RADIATION MONITORS
Y. Tamakuma, R. Yamada, T. Suzuki, T. Kuroki, R. Saga, H. Mizuno, H. Sasaki, K. Iwaoka, M. Hosoda, S. Tokonami
Radiation Protection Dosimetry 184 ( 3-4 ) 307 - 310 2019.10
-
A portable radioactive plume monitor using a silicon photodiode
Yuki Tamakuma , Ryohei Yamada , Kazuki Iwaoka , Masahiro Hosoda , Tomohiro Kuroki , Hiroyuki Mizuno , Koji Yamada , Masahide Furukawa , Shinji Tokonami
Perspectives in Science 12 100414 - 100414 2019.7
-
Evaluation of a Surface Collection Efficiency and a Stability of Flow Rate for the Commercially Available Filters Used for Ambient Radioactive Aerosols
TAMAKUMA Yuki, YAMADA Ryohei, IWAOKA Kazuki, HOSODA Masahiro, TOKONAMI Shinji
Japanese Journal of Health Physics 54 ( 1 ) 5 - 12 2019.4
-
Study of Chemical Etching Conditions for Alpha-particle Detection and Visualization Using Solid State Nuclear Track Detectors
Yamada Ryohei, Odagiri Taiki, Iwaoka Kazuki, Hosoda Masahiro, Tokonami Shinji
Radiation Environment and Medicine 8 ( 1 ) 21 - 25 2019.2
-
Measurement system for alpha and beta emitters with continuous air sampling under different exposure situations
Yamada Ryohei, Tamakuma Yuki, Iwaoka Kazuki, Hosoda Masahiro, Shiroma Yoshitaka, Akata Naofumi, Mizuno Hiroyuki, Yamada Kouji, Kuroki Tomohiro, Tokonamia Shinji
APPLIED RADIATION AND ISOTOPES 126 79 - 82 2017.8
-
Characteristic of thoron (Rn-220) in environment
Hosoda Masahiro, Kudo Hiromi, Iwaoka Kazuki, Yamada Ryohei, Suzuki Takahito, Tamakuma Yuki, Tokonami Shinji
APPLIED RADIATION AND ISOTOPES 120 7 - 10 2017.2