The Experts below are selected from a list of 15639 Experts worldwide ranked by ideXlab platform
Shinji Tokonami - One of the best experts on this subject based on the ideXlab platform.
-
Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India.
Journal of environmental radioactivity, 2016Co-Authors: Yasutaka Omori, Ganesh Prasad, Atsuyuki Sorimachi, Sarata Kumar Sahoo, Tetsuo Ishikawa, Devulapalli Vidya Sagar, Rakesh Chand Ramola, Shinji TokonamiAbstract:The Chhatrapur placer deposit is found in a high background radiation area which has been recently identified on the southeastern coast of India. Previously, some geochemical studies of this area were carried out to assess external dose from radionuclides-bearing heavy mineral Sands. In this study, radon, thoron and thoron progeny concentrations were measured in about 100 dwellings during three seasons (autumn-winter, summer, and rainy) in a 10- to 12-month period and annual doses due to inhalation of them were evaluated. The measurements were made by passive-type radon-thoron discriminative detectors and thoron progeny detectors in which solid state nuclear track detectors were deployed. The results show that radon and thoron concentrations differ by one order of magnitude depending on exposure periods, while thoron progeny concentration is nearly constant throughout the year. Since thorium-Rich Sand is distributed in the studied area, exposure to thoron is equal to, or exceeds, exposure to radon and is not negligible for dose evaluation. Based on the measurements, doses due to inhalation of radon and thoron are evaluated as 0.1-1.6 mSv y-1 and 0.2-3.8 mSv y-1, respectively. The total dose is 0.8-4.6 mSv y-1, which is the same order of magnitude as the worldwide value.
Maria Antoniou - One of the best experts on this subject based on the ideXlab platform.
-
Phlebotomine Sand flies (Diptera: Psychodidae) in the Greek Aegean Islands: ecological approaches
Parasites & Vectors, 2018Co-Authors: Nikolaos Tsirigotakis, Christoforos Pavlou, Vasiliki Christodoulou, Emmanouil Dokianakis, Christos Kourouniotis, Bulent Alten, Maria AntoniouAbstract:Background Blood-sucking phlebotomine Sand flies are the vectors of the protozoan parasites Leishmania spp. Different Phlebotomus species transmit different Leishmania species causing leishmaniases which are neglected diseases emerging/reemerging in new regions. Thirteen Sand fly species, ten belonging to the medically important genus Phlebotomus and three belonging to Sergentomyia are known in Greece. An increasing number of human and dog cases are reported each year from all parts of the country including the Aegean Islands. However, no previous study has been conducted on the Sand fly fauna on the islands, except for Rhodes and Samos. The aim of this study was to investigate Sand fly species in eleven small Aegean islands; to understand species-specific relationships with environmental and climatic factors and to compare Sand fly community parameters among islands. A risk analysis was carried out for each species using climatic and environmental variables. Results Nine Sand fly species: Phlebotomus neglectus , P. tobbi , P. similis , P. simici , P. perfiliewi , P. alexandri , P. papatasi , Sergentomyia minuta and S. dentata , were collected from the islands studied. Phlebotomus ( Adlerius ) sp . and Sergentomyia sp. specimens were also collected but not identified to the species level. There was a positive effect of distance from the sea on the abundance of P. neglectus , S. minuta and S. dentata , and a negative effect on the abundance of P. tobbi , P. simici and P. similis. In general, temperature preferences of Sand fly populations were between 21 and 29 °C. Nevertheless, there were significant differences in terms of temperature and relative humidity preference ranges among species. The most important species found, P. neglectus , was indisputably the most adapted species in the study area with a very high reaction norm, favoring even the lower temperature and humidity ranges . Overall, the Sand fly fauna in the islands was very Rich but there were differences in species diversity, as indicated by the values of the Shannon-Wiener index, along with evenness and Richness of the Sand fly fauna between the islands and altitude ranges in the islands. Conclusions The study indicated that the Greek Aegean Islands, however small, maintain a Rich Sand fly fauna. This includes important vectors of Leishmania spp. representing a risk for parasite transmission to humans and dogs along with the danger of maintaining new Leishmania spp. if introduced to the area.
Yasutaka Omori - One of the best experts on this subject based on the ideXlab platform.
-
Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India.
Journal of environmental radioactivity, 2016Co-Authors: Yasutaka Omori, Ganesh Prasad, Atsuyuki Sorimachi, Sarata Kumar Sahoo, Tetsuo Ishikawa, Devulapalli Vidya Sagar, Rakesh Chand Ramola, Shinji TokonamiAbstract:The Chhatrapur placer deposit is found in a high background radiation area which has been recently identified on the southeastern coast of India. Previously, some geochemical studies of this area were carried out to assess external dose from radionuclides-bearing heavy mineral Sands. In this study, radon, thoron and thoron progeny concentrations were measured in about 100 dwellings during three seasons (autumn-winter, summer, and rainy) in a 10- to 12-month period and annual doses due to inhalation of them were evaluated. The measurements were made by passive-type radon-thoron discriminative detectors and thoron progeny detectors in which solid state nuclear track detectors were deployed. The results show that radon and thoron concentrations differ by one order of magnitude depending on exposure periods, while thoron progeny concentration is nearly constant throughout the year. Since thorium-Rich Sand is distributed in the studied area, exposure to thoron is equal to, or exceeds, exposure to radon and is not negligible for dose evaluation. Based on the measurements, doses due to inhalation of radon and thoron are evaluated as 0.1-1.6 mSv y-1 and 0.2-3.8 mSv y-1, respectively. The total dose is 0.8-4.6 mSv y-1, which is the same order of magnitude as the worldwide value.
Devulapalli Vidya Sagar - One of the best experts on this subject based on the ideXlab platform.
-
Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India.
Journal of environmental radioactivity, 2016Co-Authors: Yasutaka Omori, Ganesh Prasad, Atsuyuki Sorimachi, Sarata Kumar Sahoo, Tetsuo Ishikawa, Devulapalli Vidya Sagar, Rakesh Chand Ramola, Shinji TokonamiAbstract:The Chhatrapur placer deposit is found in a high background radiation area which has been recently identified on the southeastern coast of India. Previously, some geochemical studies of this area were carried out to assess external dose from radionuclides-bearing heavy mineral Sands. In this study, radon, thoron and thoron progeny concentrations were measured in about 100 dwellings during three seasons (autumn-winter, summer, and rainy) in a 10- to 12-month period and annual doses due to inhalation of them were evaluated. The measurements were made by passive-type radon-thoron discriminative detectors and thoron progeny detectors in which solid state nuclear track detectors were deployed. The results show that radon and thoron concentrations differ by one order of magnitude depending on exposure periods, while thoron progeny concentration is nearly constant throughout the year. Since thorium-Rich Sand is distributed in the studied area, exposure to thoron is equal to, or exceeds, exposure to radon and is not negligible for dose evaluation. Based on the measurements, doses due to inhalation of radon and thoron are evaluated as 0.1-1.6 mSv y-1 and 0.2-3.8 mSv y-1, respectively. The total dose is 0.8-4.6 mSv y-1, which is the same order of magnitude as the worldwide value.
Rakesh Chand Ramola - One of the best experts on this subject based on the ideXlab platform.
-
Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India.
Journal of environmental radioactivity, 2016Co-Authors: Yasutaka Omori, Ganesh Prasad, Atsuyuki Sorimachi, Sarata Kumar Sahoo, Tetsuo Ishikawa, Devulapalli Vidya Sagar, Rakesh Chand Ramola, Shinji TokonamiAbstract:The Chhatrapur placer deposit is found in a high background radiation area which has been recently identified on the southeastern coast of India. Previously, some geochemical studies of this area were carried out to assess external dose from radionuclides-bearing heavy mineral Sands. In this study, radon, thoron and thoron progeny concentrations were measured in about 100 dwellings during three seasons (autumn-winter, summer, and rainy) in a 10- to 12-month period and annual doses due to inhalation of them were evaluated. The measurements were made by passive-type radon-thoron discriminative detectors and thoron progeny detectors in which solid state nuclear track detectors were deployed. The results show that radon and thoron concentrations differ by one order of magnitude depending on exposure periods, while thoron progeny concentration is nearly constant throughout the year. Since thorium-Rich Sand is distributed in the studied area, exposure to thoron is equal to, or exceeds, exposure to radon and is not negligible for dose evaluation. Based on the measurements, doses due to inhalation of radon and thoron are evaluated as 0.1-1.6 mSv y-1 and 0.2-3.8 mSv y-1, respectively. The total dose is 0.8-4.6 mSv y-1, which is the same order of magnitude as the worldwide value.
