A5045771912- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Radiation Dose and Imaging
- Radiation Therapy and Dosimetry
- Radiation Effects and Dosimetry
- Radiation Detection and Scintillator Technologies
- Nuclear and radioactivity studies
- Effects of Radiation Exposure
- Advanced Radiotherapy Techniques
- Medical Imaging Techniques and Applications
- Nuclear Issues and Defense
- Nuclear reactor physics and engineering
- Boron Compounds in Chemistry
- Graphite, nuclear technology, radiation studies
- Radiation Shielding Materials Analysis
- Nuclear physics research studies
- Carcinogens and Genotoxicity Assessment
- X-ray Spectroscopy and Fluorescence Analysis
- Thyroid Cancer Diagnosis and Treatment
- Radioactive element chemistry and processing
- Radioactive Decay and Measurement Techniques
- Plant Genetic and Mutation Studies
- DNA Repair Mechanisms
- Suicide and Self-Harm Studies
Hiroshima University
2016-2025
NTT (Japan)
2023
Higashihiroshima Medical Center
2023
Medical Radiological Research Center
2005-2022
Ministry of Health of the Russian Federation
2022
Japanese Foundation For Cancer Research
2004-2020
Hiroshima University of Economics
2018
Leidos (United States)
2015
Helmholtz Zentrum München
2013-2015
Lawrence Livermore National Laboratory
2013-2015
After the Chernobyl nuclear power plant accident in April 1986, a large increase incidence of childhood thyroid cancer was reported contaminated areas. Most radiation exposure to from iodine isotopes, especially 131I. We carried out population-based case-control study Belarus and Russian Federation evaluate risk after radioactive investigate environmental host factors that may modify this risk.We studied 276 case patients with through 1998 1300 matched control subjects, all aged younger than...
Soil deposition density maps of gamma-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant (NPP) accident were constructed on basis results large-scale soil sampling. In total 10,915 samples collected at 2168 locations. Gamma rays emitted measured by Ge detectors and analyzed using a reliable unified method. The determined radioactivity was corrected to that June 14, 2011 considering intrinsic decay constant each nuclide. Finally created for 134Cs, 137Cs, 131I,...
We present a feasibility study for using 236U as an oceanic circulation tracer based on depth profiles of and 137Cs in the Japan/East Sea. The concentration predominantly anthropogenic 236U, measured with Accelerator Mass Spectrometry (AMS), decreased from (13±3)×106 atom/kg surface water to (1.6±0.3)×106 close sea floor (2800 m). profile has smooth trend values are generally proportional that same samples, but slightly lower ratio 137Cs/236U below 2000 m. cumulative inventory dissolved...
More than a decade has passed since complete revision was initiated of the radiation doses received by survivors Hiroshima and Nagasaki atomic bombings. The new dosimetry system (DS86) completed in 1986 adopted shortly thereafter. Overall, DS86 noted to be clear improvement over old system. However, based on limited validation measurements, troublesome inconsistencies were suggested for neutrons. Since 1986, substantial number additional neutron activation measurements have been made mineral...
A field survey was carried out soon after the Fukushima Dai-ichi Nuclear Power Plant accident. Gamma-ray emitting radionuclides and plutonium isotopes in a series of soil samples collected from heavily contaminated areas outside 20-km exclusion zone, as well Okuma Town adjacent to plant, were measured. Volatile such 131I, 134Cs, 137Cs contributed largely released radioactivity. Higher depositions these nuclides observed northwestern—including Iitate Village, which is at distance 25-45 km...
To understand the biological effects of residual radioactivity after atomic bomb explosion in Hiroshima and Nagasaki, we previously investigated 56Mn, a major radioisotope. Our rat study demonstrated that inhalation exposure to 56MnO2 microparticles affected gene expression lungs, testes, liver, despite low radiation doses. Because 56Mn is β- γ-emitter, differential between γ-rays should be clarified. In this study, 31Si, β-emitter with radioactive half-life similar was used determine its...
Since the atomic bomb explosions in Hiroshima and Nagasaki, high incidences of leukemia, thyroid cancer other tumors have been reported as bomb-induced tumors. We investigated incidence meningioma among survivors. Sixty-eight patients surgically treated for who had within 2.0 km hypocenter explosion were identified. Six hundred seven non-exposed with also studied. Treatment dates from 1975 to 1992.The 68 subjects 607 8.7 3.0 cases per 105 persons year, respectively. The survivors 5-year...
Individual accumulated doses were determined by EPR spectroscopy of tooth enamel for 26 adult persons residing in territories adjacent to the Semipalatinsk Nuclear Test Site (SNTS). The absorbed dose values due radiation from nuclear tests obtained after subtracting contribution natural background total dose. ranged up 250 mGy, except one person city with a measured 2.8 +/- 0.4 Gy. Increased individuals whose teeth formed before 1962, end atmospheric tests. These found be significantly...
Measurements of 137Cs body burden were carried out in 1991–1996 for children residing the western part Bryansk Oblast (Russia) where area contamination with following Chernobyl accident varied from 0.03-3.7 MBq m−2. The mean and median values specific activity (SA) bodies 5–15 y old whole period surveillance averaged 26,029 measurements was 85 Bq kg−1 49 kg−1, respectively. Mean different places residence 30–342 settlements number examinees not less than 50. There is a moderately strong...
Screening by ultrasound examination and fine-needle aspiration cytological biopsy (FNA) was conducted in five regions Belarus, Ukraine, Russia to investigate the prevalence of childhood thyroid diseases around Chernobyl. Gomel, Zhitomir, Kiev, western area Bryansk are administrative where severe radioactive contamination occurred. The subjects from Mogilev, relatively low, served as controls. Among 55,054 (26,406 boys 28,648 girls), ultrasonographic abnormalities such nodule, cyst, abnormal...
A computer routine was developed for automatic deconvolution of electron paramagnetic resonance spectra tooth enamel samples individual radiation dose reconstruction in the low region. The uses non-linear least square fit a model simulating spectrum by superposition derivative Gaussian functions to obtain amplitude dosimetric induced signal. parameters and were optimized on response level using criterion standard deviation derived signal from regression line vs. nominal doses series...
Specific activities of 152Eu:Eu in stone samples exposed to the Hiroshima atomic bomb were determined for 70 up a 1,500-m slant range from epicenter. The specific 60Co:Co also six near hypocenter. First, 152Eu data investigated find out directional dependence neutron activation. Directional anisotropy was not definite; however, there an indication that activation west-southwest lower than other directions. Second, measured and 60Co radioactivity compared with calculations based on DS86...
Journal Article The Third International Intercomparison on EPR Tooth Dosimetry: part 2, final analysis Get access A. Wieser, Wieser *Corresponding author: wieser@gsf.de Search for other works by this author on: Oxford Academic PubMed Google Scholar R. Debuyst, Debuyst P. Fattibene, Fattibene Meghzifene, Meghzifene S. Onori, Onori N. Bayankin, Bayankin Brik, Brik Bugay, Bugay V. Chumak, Chumak B. Ciesielski, Ciesielski ... Show more M. Hoshi, Hoshi H. Imata, Imata Ivannikov, Ivannikov D....
The method of electron paramagnetic resonance (EPR) dosimetry was applied to the enamel teeth extracted from residents Dolon and Bodene settlements Beskaragay district, which is area adjacent radioactive fallout most contaminating nuclear test 1949. individual accidental radiation doses due were obtained amplitude induced EPR signal CO2- radical using calibration method, after determining parameters measurements obtain best reproducibility intensities. It shown that subtracting natural...
The method of electron paramagnetic resonance (EPR) spectroscopy for tooth enamel is applied to individual radiation dose determination residents two villages (Dolon and Mostik) in the vicinity Semipalatinsk nuclear test site Kazakhstan. These are located near central axis radioactive fallout trace most contaminating surface conducted 1949. It found that excess doses obtained by subtraction natural background from absorbed range up 440 mGy Dolon, whose was formed before 1949, do not exceed...