A5032253717- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- Radiation Detection and Scintillator Technologies
- Radiation Dose and Imaging
- Nuclear and radioactivity studies
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Geochemistry and Geologic Mapping
- Geophysical Methods and Applications
- Earthquake Detection and Analysis
- Geology and Environmental Impact Studies
- Radioactive Decay and Measurement Techniques
- Radiation Shielding Materials Analysis
- Landslides and related hazards
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Non-Destructive Testing Techniques
- Geotechnical Engineering and Underground Structures
- Magnetic Field Sensors Techniques
- Mine drainage and remediation techniques
- Ultrasonics and Acoustic Wave Propagation
- Particle Detector Development and Performance
- Integrated Water Resources Management
- Advanced X-ray and CT Imaging
- Field-Flow Fractionation Techniques
National Institutes for Quantum Science and Technology
2015-2025
Institute of Nuclear Physics, Polish Academy of Sciences
1999-2012
Chiba University
2009
Tokyo Metropolitan University
2009
Institute of Nuclear Physics
2009
Institute of Economic Sciences
2009
Polish Academy of Sciences
2004
This study examined correlations between radon, thoron and progeny concentrations based on surveys conducted in several different countries. For this purpose, passive detectors developed or modified by the National Institute of Radiological Sciences (NIRS) were used. Radon measured using discriminative radon-thoron detectors. Thoron measurements NIRS-modified detector, originally Zhuo Iida. Weak found radon as well progeny. The statistical evaluation showed that attention should be paid to...
This study examines the impact of soil temperature on radon transport and exhalation near Sakurajima volcano, Japan. Continuous measurements at various depths revealed a thermal gradient, with decreasing fluctuations greater depths, leading to more stable emissions. finding underscores importance accurate data in understanding dynamics. The research highlights influence soil-gas permeability by affecting dynamic viscosity gases. Discrepancies between measured calculated profiles, using...
Exposure to radon, 222Rn, is assumed be the most significant source of natural radiation human beings in cases. It thought that radon and its progeny are major factors cause cancer. The presence thoron, 220Rn, was often neglected because it considered quantity thoron environment less than radon. However, recent studies have shown a high concentration found some regions exposure 220Rn can equal or several time exceed progeny. results measurements houses background area (HBRA) southeastern...
Abstract The radon (Rn) and thoron (Tn) concentrations other environmental parameters were measured in the vicinity of active faults two regions with different geology structure Japan. range values was from 1.2 to 74 kBq m$^{-3}$, 1.1 38.9 0% 4.35%, 2$\times $10$^{-13}$ 4$\times $10$^{-11}$ m$^{2}$, for Rn, Tn, CO$_{2}$, soil permeability, respectively. Significant differences observed, suggesting that Rn near are strongly influenced by geological fault type. Based on statistical analysis,...
Journal Article Preliminary indoor thoron measurements in high radiation background area of southeastern coastal Orissa, India Get access R. C. Ramola, Ramola * 1Department Physics, H.N.B. Garhwal University, Badshahi Thaul, Tehri 249 199, *Corresponding author: rcramola@gmail.com Search for other works by this author on: Oxford Academic PubMed Google Scholar G. Prasad, Prasad S. Gusain, Gusain B. Rautela, Rautela V. M. Choubey, Choubey 2Wadia Institute Himalayan Geology, Dehradun 248 001,...
Journal Article Long-term measurements of thoron, its airborne progeny and radon in 205 dwellings Ireland Get access J. McLaughlin, McLaughlin * 1University College Dublin, *Corresponding author: james.mclaughlin@ucd.ie Search for other works by this author on: Oxford Academic PubMed Google Scholar M. Murray, Murray 2Radiological Protection Institute Ireland, L. Currivan, Currivan D. Pollard, Pollard V. Smith, Smith S. Tokonami, Tokonami 3National Radiological Sciences, Chiba, Japan A....
Radon diffusion through soil is strongly affected by the degree of water saturation pores. Methods have been developed many researchers to measure radon coefficient. We an updated experimental system estimate coefficients for typical types in Japan and applied it a loam with different levels (0–0.82). The consists passive-type scintillation cell, column, accumulation tank, source. concentration tank kept stable, diffused column continuously measured cell. found vary from 9.60 × 10−6 m2 s−1...
Journal Article Quality assurance and quality control for thoron measurement at NIRS Get access A. Sorimachi, Sorimachi National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba City, 263-8555Japan Search other works by this author on: Oxford Academic PubMed Google Scholar T. Ishikawa, Ishikawa M. Janik, Janik S. Tokonami * *Corresponding author: tokonami@nirs.go.jp Radiation Protection Dosimetry, Volume 141, Issue 4, October 2010, Pages 367–370,...
Intercomparisons of radon/thoron detectors play an important role not only for domestic survey but also international or interregional discussion about mapping in dwellings as well that the soil. For these purposes, it is necessary to improve and standardise technical methods measurement verify quality assurance by intercomparisons between laboratories. Therefore, first thoron intercomparison was provided at NIRS (National Institute Radiological Sciences, Japan) chamber with a 150 dm3 inner...
Common building materials used in constructing dwellings are a major source of radon and thoron gases emanation into the indoor environment.Concentrations radionuclides 226 Ra 232 Th radon/thoron exhalation rates important parameters for characterizing sources comparing relative contribution different to total radiation dose.In present study, concentrations Ra, 40 K kinds granite as Japan were determined by γ-ray spectroscopy, common hazard index, radium equivalent was evaluated on basis...
Naturally occurring isotopes of radon in indoor air are identified as the second leading cause lung cancer after tobacco smoking. Radon-222 (radon gas) and radon-220 (thoron most common radon. While extensive surveys have been conducted, thoron data very limited. To better assess exposure Canada, radon/thoron discriminating detectors were deployed 45 homes Fredericton 65 Halifax for a period 3 months. In this study, concentrations ranged from 16 to 1374 Bq m(-3) with geometric mean (GM) 82...
Inhalation of radon ((222)Rn) and its short-lived decay products the thoron ((220)Rn) series accounts for more than half effective dose from natural radiation sources. At this time, many countries have begun large-scale surveys different measurement methods instruments are used in these studies. Consequently, it is necessary to improve standardize technical measurements verify quality assurance by intercomparisons between laboratories. Four international passive integrating monitors were...
Indoor radon is a major hazard to human health; it one of the leading causes lung cancer. Therefore, research in Asia has intensified recently due growing awareness harm that poses. An analysis collected literature data showed Asia–Oceania, some regions have—or are believed have—little indoor problems climate and low Rn ground. It can be concluded countries have their own approaches, techniques, protocols. Data were not harmonized within each region; however, measurement techniques compared...