Article
Multidisciplinary Sciences
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
Summary: Mamuju is a unique High Natural Background Radiation Area with an average annual effective dose of 32 mSv. The lifetime cumulative dose calculation suggests that residents could receive as much as 2.2 Sv on average, much higher than atomic bomb survivors. The study results provide new scientific data for understanding health effects related to chronic low-dose-rate radiation exposure and can be used in future epidemiology studies.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
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
Summary: The study found a unique high natural radiation area in Indonesia where residents are exposed to chronic low dose-rate radiation. Indoor radon concentrations exceeded the reference levels recommended by the World Health Organization, and outdoor radon concentrations were comparable to high indoor levels. The annual effective dose due to external and internal exposures in the study area exceeded the dose limit for radiation workers, suggesting the need for further epidemiological studies on health effects.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Chanis Pornnumpa Rattanapongs, Chutima Kranrod, Manit Jitpakdee, Shinji Tokonami, Supitcha Chanyotha
Summary: In this study, Raduet and a radon-thoron progeny monitor with a solid-state nuclear tracking detector were used to estimate indoor radon, thoron and their progeny concentrations in residential areas around the old mines of southern Thailand. Exposure to high background radiation levels may increase the risk of lung cancer in the respiratory system. The radiation effects were assessed by measuring the concentrations in volunteer houses.
RADIATION PROTECTION DOSIMETRY
(2022)
Article
Chemistry, Physical
Ashwini Udupi, Pramoda Kumara Shetty, Priyada Panikkath, Pradip Kumar Sarkar
Summary: This study investigates the estimation of neutron ambient dose equivalent and effective dose using prompt gamma intensities. Different materials were used as outer layer covering for detection systems, and iron, nickel, zinc, and copper showed promising results as replacements for boron in high energy neutron distributions.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Chemistry, Analytical
Amit Kumar Singla, Sandeep Kansal, Rohit Mehra
Summary: The study assessed the dose received by individual tissues or organs of human beings from indoor radon and thoron exposure in 75 dwellings in Hanumangarh district of Rajasthan, India. The estimated average annual effective dose was found to be lower than the recommended limits, indicating that indoor radon may not pose a health risk to the local population.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
M. S. Bandstra, B. J. Quiter, K. J. Bilton, J. C. Curtis, S. Goldenberg, T. H. Y. Joshi, M. Salathe
Summary: When searching for radiological sources in an urban area, a vehicle-borne detector system will often measure complex, varying backgrounds primarily from natural gamma-ray sources. Recent research focuses on modeling urban areas to understand the origins of these complex backgrounds. By analyzing panoramic video images and gamma-ray background data, correlations were found between image-derived features and gamma-ray spectral features.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2021)
Article
Environmental Sciences
Xinhang Qiao, Wenxuan Cui, Sheng Gao, Qiang Zhi, Bin Li, Yaochun Fan, Li Liu, Jianqiong Gao, Hongli Tan
Summary: This study investigated the occupational exposure to rare earth elements (REEs) in a major REE processing plant in North China. The results showed that external exposure significantly influenced internal REE exposure in the workers. Other factors such as residence time and type of work also had an impact on occupational exposure to selected REEs. The findings highlight the importance of assessing health risks and managing occupational hazards from REE exposure.
ENVIRONMENTAL POLLUTION
(2022)
Article
Biology
Yinping Su, Yan Wang, Shinji Yoshinaga, Weiguo Zhu, Shinji Tokonami, Jianming Zou, Guangxiang Tan, Mayumi Tsuji, Suminori Akiba, Quanfu Sun
Summary: The study aimed to assess the risk and threshold doses of lens opacity among residents exposed to low-dose radiation. It found that individuals exposed to lifetime, low-dose-rate environmental radiation were at an increased risk of cortical and PSC lens opacities, with a statistically significant threshold dose identified for cortical lens opacities but not for PSC lens opacities.
JOURNAL OF RADIATION RESEARCH
(2021)
Article
Multidisciplinary Sciences
Thamer Alharbi
Summary: LaBr3:(Ce) is a scintillation gamma-ray detector that exhibits the best energy resolution. It has various applications in radiation detection, such as environmental monitoring, medical imaging, nuclear security, and nuclear physics experiments. However, the detector suffers from internal radioactivity, particularly with large size detectors measuring low-intensity gamma-rays. Previous digital pulse-shape discrimination (PSD) methods have been proposed to reduce the alpha-background, but further reduction is desired for low-background gamma-ray measurements. In this study, a novel digital PSD method based on wavelet transform was developed, significantly improving the rejection of the alpha-background for low-level radiation measurements involving high-energy gamma rays.
JOURNAL OF KING SAUD UNIVERSITY SCIENCE
(2022)
Article
Chemistry, Physical
Dhanya Balakrishnan, P. J. Jojo, Mayeen Uddin Khandaker
Summary: The study evaluated the Potential Alpha Energy Concentration (PAEC) of radon and thoron progenies in dwellings in the Eloor industrial region in Kerala, finding that homes with marble floors had higher concentrations. The total inhalation dose was measured to be 0.23 mSv y(-1) based on aerosol samples collected and gross particulate activity measurements.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Environmental Sciences
Junyu Guo, Ying Zhou, Yifei Wang, Yuan Chen, Boya Zhang, Jianbo Zhang
Summary: This study assessed the external and internal exposure to Methylsiloxanes (MSs) among students at two universities in southwestern China. The study found that MS levels were higher in the dormitories of female students compared to classrooms or male students' dormitories. Lipstick contained the highest MS levels. The study also observed differences in the exposure routes between female and male students. Although the overall risk of exposure to D4 and D5 was low for all students, four female students exceeded the chronic reference dose through dermal absorption.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Ali E. Omar, Korany A. Korany, Khaled A. Abdel-Halim
Summary: The present article aims to assess the environmental impact of terrestrial natural radionuclides, external gamma exposure dose radiation, and the average effective annual dose value. Through extensive measurements using airborne gamma ray spectrometry, the study area's specific activity concentration, absorbed dose rate, annual effective dose rate, collective dose, and annual effective dose value for the population were calculated. The results indicate that certain areas have high background radiation.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
D. E. Tchorz-Trzeciakiewicz, M. Rysiukiewicz
Summary: The study aimed to analyze the usefulness of ambient gamma dose rate survey in assessing radon concentration in the environment and geogenic radon potential. The results showed a significant correlation between ambient gamma dose rate and radon concentrations in soil and atmosphere, indicating that ambient gamma dose rate can be a useful parameter to indicate geogenic radon potential.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Divya Patel, Manoj Kumar Jindal, Padmaja Sudhakar Pamidimukkala, Debjani Chakraborty
Summary: This study analyzed outdoor radiation in four districts of Gujarat, India and found that both season and lithology have an influence on gamma radiation dose rate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Multidisciplinary Sciences
Malin Larsson, Nils-Petter Rudqvist, Johan Spetz, Toshima Z. Parris, Britta Langen, Khalil Helou, Eva Forssell-Aronsson
Summary: This study aimed to compare the differences in RNA and protein expression in the thyroid and plasma of young and adult rats exposed to I-131 irradiation, and identify potential age-dependent biomarkers for I-131 exposure. The results showed distinct age-dependent differences in gene and protein expression, and novel biomarkers for thyroid I-131 exposure were identified.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
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
Summary: After the Fukushima Daiichi Nuclear Power Plant accident, the relative contribution of natural radiation is increasing in Fukushima Prefecture. It is important to accurately determine the effective dose of exposure to artificial radiation by evaluating both natural and artificial components. A study in Namie Town, Fukushima Prefecture, measured gamma-ray pulse-height distribution to evaluate the annual effective dose of external exposure from natural and artificial radionuclides. The annual effective dose of external exposure, discriminated into natural and artificial radionuclides, is expected to be used for radiation risk communication.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Environmental Sciences
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
Summary: The concentrations of Rn-222 and Ra-226 in spring water in northern Japan were measured and found to be below the reference values set by international and European/American organizations. The annual effective ingestion dose from drinking this water was significantly lower than the overall annual effective dose from natural radiation to the Japanese population, but accounted for 8% of the WHO individual dosing criteria for drinking water.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Public, Environmental & Occupational Health
Hiromi Kudo, Shinji Yoshinaga, Xiaoliang Li, Shujie Lei, Shouzhi Zhang, Quanfu Sun, Chihaya Koriyama, Suminori Akiba, Shinji Tokonami
Summary: This study investigated the risk of lung cancer associated with indoor radon concentrations in Gansu, China, and found a non-significant increase in risk. Despite limitations in sample size, the study highlights the importance of precise exposure assessment for reevaluating the association between residential radon and lung cancer risk in epidemiological studies.
FRONTIERS IN PUBLIC HEALTH
(2021)
Article
Environmental Sciences
Eka Djatnika Nugraha, June Mellawati, Wahyudi, Chutima Kranrod, Makhsun, Hirofumi Tazoe, Haeranah Ahmad, Masahiro Hosoda, Naofumi Akata, Shinji Tokonami
Summary: The study in Mamuju, Indonesia, found high levels of natural radionuclides and heavy metals in the soil, indicating moderate contamination. The pollution indices and correlation analyses showed potential hazards to human health in Mamuju due to the presence of Pb and other heavy metals. Measures need to be taken to address and monitor the environmental pollution in Mamuju.
Article
Environmental Sciences
Jun Hu, Yunyun Wu, Miki Arian Saputra, Yanchao Song, Guosheng Yang, Shinji Tokonami
Summary: This study investigates the relationship between outdoor PM2.5 concentrations and indoor radon inhalation exposure by measuring radon and its progeny concentrations. The results show that indoor radon concentrations and inhalation exposure are correlated with the air quality levels of the cities.
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
(2022)
Article
Chemistry, Multidisciplinary
Shunrou Tokonami, Morihiko Onose, Yusuke Nakasone, Masahide Terazima
Summary: The study revealed slow reaction kinetics in milliseconds for all examined BLUF proteins, contrary to previous beliefs of nanosecond red shifts. The slower dynamics in the tau(2)-phase were found to be strongly influenced by the size and nature of the C-terminal region adjacent to the BLUF domain, indicating its importance for biological functions. These results highlight the significance of Trp in the BLUF domain and propose a reaction scheme for BLUF reaction.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Biology
Narongchai Autsavapromporn, Chutima Krandrod, Pitchayaponne Klunklin, Rawiwan Kritsananuwat, Churdsak Jaikang, Kittikun Kittidachanan, Imjai Chitapanarux, Somchart Fugkeaw, Masahiro Hosoda, Shinji Tokonami
Summary: This paper presents the first investigation of the health impacts of indoor radon exposure and external dose from terrestrial radiation in Chiang Mai province during the dry season burning between 2018 and 2020. The results show that indoor radon activity concentration during the burning season was significantly higher compared to the non-burning season, and both exceeded the national and worldwide average values. The study also found that the external dose from terrestrial radiation during the burning season was higher than the worldwide average value. Overall, this study demonstrates that indoor radon and natural radioactive elements in the air play important roles in the development of lung cancer.
Article
Environmental Sciences
Hidenao Hasegawa, Hideki Kakiuchi, Shinya Ochiai, Naofumi Akata, Shinji Ueda, Shinji Tokonami
Summary: This study measured the activity concentrations of I-129 in atmospheric particulate matter samples from an area evacuated after the Fukushima Dai-ichi Nuclear Power Plant accident. The results showed that the behavior of I-129 in atmospheric PM was different from that in contaminated soils, suggesting the importance of other atmospheric PMs as hosts for I-129.
RADIATION PROTECTION DOSIMETRY
(2022)
Article
Polymer Science
Worawat Poltabtim, Arkarapol Thumwong, Ekachai Wimolmala, Chanis Rattanapongs, Shinji Tokonami, Tetsuo Ishikawa, Kiadtisak Saenboonruang
Summary: The study found that neutron and X-ray shielding properties of the Gd2O3/NR composites improved with increased Gd2O3 content, while tensile strength and elongation decreased, and hardness increased. Self-healing experiments demonstrated the potential for autonomous repair in the materials.
Article
Polymer Science
Arkarapol Thumwong, Manchusa Chinnawet, Preawpraw Intarasena, Chanis Rattanapongs, Shinji Tokonami, Tetsuo Ishikawa, Kiadtisak Saenboonruang
Summary: This study experimentally determined the X-ray shielding and morphological, density, and tensile properties of sulfur-vulcanized natural rubber latex nanocomposites containing different amounts of nano-Bi2O3 or nano-BaSO4. The results showed that the overall X-ray attenuation abilities of the nanocomposites increased with increasing filler content, while the addition of fillers also affected the mechanical properties. The study also proposed modified procedures to improve the strength of the samples for potential use in medical X-ray protective gloves.
Article
Biochemistry & Molecular Biology
Masaru Yamaguchi, Yota Tatara, Eka Djatnika Nugraha, Yoshiaki Sato, Tomisato Miura, Masahiro Hosoda, Mukh Syaifudin, Shinji Tokonami, Ikuo Kashiwakura
Summary: Proteomic analysis of serum components from mice exposed to ionizing radiation revealed dose-dependent protein variations and oxidative modifications in albumin. It also detected variations in other proteins that correlated with radiation dose. These findings suggest that protein variations and serum albumin oxidative modification responses may serve as important indicators for the effects of radiation on living organisms and as potential biomarkers for radiation dose estimation.
Article
Chemistry, Analytical
Jubair Al Mahmud, M. M. Mahfuz Siraz, Mohammad Shafiqul Alam, Sudeb Chandra Das, David Andrew Bradley, Mayeen Uddin Khandaker, Shinji Tokonami, Afroza Shelley, Selina Yeasmin
Summary: The first-ever measurement of radon concentration in commercial bottled water and deep well water samples from Dhaka city was conducted using the RAD7 Radon monitoring system. The results showed that all water samples had radon concentrations within the recommended limits, highlighting the importance of monitoring radon for public health.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Masaru Yamaguchi, Yota Tatara, Eka Djatnika Nugraha, Yuki Tamakuma, Yoshiaki Sato, Tomisato Miura, Masahiro Hosoda, Shinji Yoshinaga, Mukh Syaifudin, Shinji Tokonami, Ikuo Kashiwakura
Summary: The high-level natural background radiation area in Mamuju, Indonesia provides an opportunity to study the effects of chronic low-dose radiation exposure on humans. Proteomic and oxidative modification profiling analyses were conducted to examine the serum components of residents. The findings suggest that specific protein expression alterations and oxidative modifications of serum albumin may serve as important indicators for estimating radiation dose.
Article
Biochemistry & Molecular Biology
Arkarapol Thumwong, Jitsuna Darachai, Nuatawan Thamrongsiripak, Shinji Tokonami, Tetsuo Ishikawa, Kiadtisak Saenboonruang
Summary: This work aims to alleviate the issues caused by rapid increases in agricultural wastes by introducing waste fruit peel powder (FPP) derived from mangosteen, pomelo, or durian as natural antioxidants and reinforcing bio-fillers in natural rubber latex (NRL) gloves. The investigation showed that the addition of FPP to NRL composites enhanced the strength and elongation at the break of the specimens, and also provided natural antioxidant properties. The recommended FPP contents for actual glove production were determined based on the comparison with the requirements for medical examination latex gloves.
Article
Environmental Sciences
Mizuo Kajino, Akira Watanabe, Masahide Ishizuka, Kazuyuki Kita, Yuji Zaizen, Takeshi Kinase, Rikuya Hirai, Kakeru Konnai, Akane Saya, Kazuki Iwaoka, Yoshitaka Shiroma, Hidenao Hasegawa, Naofumi Akata, Masahiro Hosoda, Shinji Tokonami, Yasuhito Igarashi
Summary: The resuspension of Cs-137 is crucial for understanding its behavior in the environment and estimating human exposure. Previous simulations underestimated the resuspension due to incorrect assumptions about the carriers and deposition rates. A new simulation, based on surface concentrations and deposition amounts, showed that the annual resuspension of Cs-137 in 2013 accounted for 0.96% of the initial deposition, with a significant amount of Cs-137 being redeposited. The simulation also revealed the presence of additional resuspension sources in Fukushima city.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
