The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Amit Kumar - One of the best experts on this subject based on the ideXlab platform.
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measurement of indoor Radon thoron concentration and Radon soil gas in some north indian dwellings
Journal of Geochemical Exploration, 2014Co-Authors: Amit Kumar, R P ChauhanAbstract:Abstract The indoor Radon, thoron and their decay products are the main contributors of total inhalation dose in the living environment. Radon soil gas concentration is about thousand times higher as compared to environment. Thus, it is necessary to measure indoor Radon–thoron and Radon soil gas underneath the soil. Keeping this in mind the measurements of Radon and thoron in the indoor environment in some parts of Northern Haryana, India were carried out using twin cup dosimeters along with Radon soil gas underneath the soil. The calibration factor for these dosimeters was measured during repeated experimental exercise and verified for two different depths. The Radon and thoron concentration in the dwellings varied from 17 to 51 Bq/m 3 and 9 to 73 Bq/m 3 , while the Radon soil gas varied from 2.80 kBq/m 3 to 6.46 kBq/m 3 . The Radon soil gas and indoor Radon–thoron concentration strongly depend upon the geological formations. A good correlation was found between the indoor Radon and thoron concentration for mud houses.
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modeling of indoor Radon concentration from Radon exhalation rates of building materials and validation through measurements
Journal of Environmental Radioactivity, 2014Co-Authors: Amit Kumar, R P Chauhan, Manish Joshi, B K SahooAbstract:Abstract Building materials are the second major source of indoor Radon after soil. The contribution of building materials towards indoor Radon depends upon the radium content and exhalation rates and can be used as a primary index for Radon levels in the dwellings. The Radon flux data from the building materials was used for calculation of the indoor Radon concentrations and doses by many researchers using one and two dimensional model suggested by various researchers. In addition to radium content, the Radon wall flux from a surface strongly depends upon the Radon diffusion length ( L ) and thickness of the wall (2 d ). In the present work the indoor Radon concentrations from the measured Radon exhalation rate of building materials calculated using different models available in literature and validation of models was made through measurement. The variation in the predicted Radon flux from different models was compared with d / L value for wall and roofs of different dwellings. The results showed that the Radon concentrations predicted by models agree with experimental value. The applicability of different model with d / L ratio was discussed. The work aims to select a more appropriate and general model among available models in literature for the prediction of indoor Radon.
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Radon resistant potential of concrete manufactured using ordinary portland cement blended with rice husk ash
Atmospheric Environment, 2013Co-Authors: R P Chauhan, Amit KumarAbstract:Abstract The emission of Radon from building materials and soil depends upon the radium content, porosity, moisture content and Radon diffusion length of materials. Several techniques have been used to reduce the Radon emission from the soil using different flooring materials. But the effectiveness of Radon shielding depends upon the diffusion of Radon through these materials. The present study proposes a method for producing a Radon resistant material for decreasing Radon diffusion through it. The method involves rice husk ash (RHA) in addition to cement for the preparation of concrete used for flooring and walls. The Radon diffusion, exhalation and mechanical property of concrete prepared by rice husk ash blended cement were studied. The addition of RHA caused the reduction in Radon diffusion coefficient, exhalation rates, porosity and enhanced the compressive strength of concrete. The bulk Radon diffusion coefficient of cementitious concrete was reduced upto 69% by addition of rice husk ash as compare to that of control concrete.
R P Chauhan - One of the best experts on this subject based on the ideXlab platform.
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measurement of indoor Radon thoron concentration and Radon soil gas in some north indian dwellings
Journal of Geochemical Exploration, 2014Co-Authors: Amit Kumar, R P ChauhanAbstract:Abstract The indoor Radon, thoron and their decay products are the main contributors of total inhalation dose in the living environment. Radon soil gas concentration is about thousand times higher as compared to environment. Thus, it is necessary to measure indoor Radon–thoron and Radon soil gas underneath the soil. Keeping this in mind the measurements of Radon and thoron in the indoor environment in some parts of Northern Haryana, India were carried out using twin cup dosimeters along with Radon soil gas underneath the soil. The calibration factor for these dosimeters was measured during repeated experimental exercise and verified for two different depths. The Radon and thoron concentration in the dwellings varied from 17 to 51 Bq/m 3 and 9 to 73 Bq/m 3 , while the Radon soil gas varied from 2.80 kBq/m 3 to 6.46 kBq/m 3 . The Radon soil gas and indoor Radon–thoron concentration strongly depend upon the geological formations. A good correlation was found between the indoor Radon and thoron concentration for mud houses.
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modeling of indoor Radon concentration from Radon exhalation rates of building materials and validation through measurements
Journal of Environmental Radioactivity, 2014Co-Authors: Amit Kumar, R P Chauhan, Manish Joshi, B K SahooAbstract:Abstract Building materials are the second major source of indoor Radon after soil. The contribution of building materials towards indoor Radon depends upon the radium content and exhalation rates and can be used as a primary index for Radon levels in the dwellings. The Radon flux data from the building materials was used for calculation of the indoor Radon concentrations and doses by many researchers using one and two dimensional model suggested by various researchers. In addition to radium content, the Radon wall flux from a surface strongly depends upon the Radon diffusion length ( L ) and thickness of the wall (2 d ). In the present work the indoor Radon concentrations from the measured Radon exhalation rate of building materials calculated using different models available in literature and validation of models was made through measurement. The variation in the predicted Radon flux from different models was compared with d / L value for wall and roofs of different dwellings. The results showed that the Radon concentrations predicted by models agree with experimental value. The applicability of different model with d / L ratio was discussed. The work aims to select a more appropriate and general model among available models in literature for the prediction of indoor Radon.
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Radon resistant potential of concrete manufactured using ordinary portland cement blended with rice husk ash
Atmospheric Environment, 2013Co-Authors: R P Chauhan, Amit KumarAbstract:Abstract The emission of Radon from building materials and soil depends upon the radium content, porosity, moisture content and Radon diffusion length of materials. Several techniques have been used to reduce the Radon emission from the soil using different flooring materials. But the effectiveness of Radon shielding depends upon the diffusion of Radon through these materials. The present study proposes a method for producing a Radon resistant material for decreasing Radon diffusion through it. The method involves rice husk ash (RHA) in addition to cement for the preparation of concrete used for flooring and walls. The Radon diffusion, exhalation and mechanical property of concrete prepared by rice husk ash blended cement were studied. The addition of RHA caused the reduction in Radon diffusion coefficient, exhalation rates, porosity and enhanced the compressive strength of concrete. The bulk Radon diffusion coefficient of cementitious concrete was reduced upto 69% by addition of rice husk ash as compare to that of control concrete.
W J Angell - One of the best experts on this subject based on the ideXlab platform.
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Radon control activities for lung cancer prevention in national comprehensive cancer control program plans 2005 2011
Preventing Chronic Disease, 2013Co-Authors: Antonio Neri, Sherri L Stewart, W J AngellAbstract:INTRODUCTION Radon is the second leading cause of lung cancer among smokers and the leading cause among nonsmokers. The US Environmental Protection Agency recommends that every home be tested for Radon. Comprehensive Cancer Control (CCC) programs develop cancer coalitions that coordinate funding and resources to focus on cancer activities that are recorded in cancer plans. Radon tests, remediation, and Radon mitigation techniques are relatively inexpensive, but it is unclear whether coalitions recognize Radon as an important carcinogen. METHODS We reviewed 65 cancer plans created from 2005 through 2011 for the terms "Radon," "radiation," or "lung." Plan activities were categorized as Radon awareness, home testing, remediation, supporting Radon policy activities, or policy evaluation. We also reviewed each CCC program's most recent progress report. Cancer plan content was reviewed to assess alignment with existing Radon-specific policies in each state. RESULTS Twenty-seven of the plans reviewed (42%) had Radon-specific terminology. Improving awareness of Radon was included in all 27 plans; also included were home testing (n=21), remediation (n=11), support Radon policy activities (n=13), and policy evaluation (n=1). Three plans noted current engagement in Radon activities. Thirty states had Radon-specific laws; most (n=21) were related to Radon professional licensure. Eleven states had cancer plan activities that aligned with existing state Radon laws. CONCLUSION Although several states have Radon-specific policies, approximately half of cancer coalitions may not be aware of Radon as a public health issue. CCC-developed cancer coalitions and plans should prioritize tobacco control to address lung cancer but should consider addressing Radon through partnership with existing Radon control programs.
Antonio Neri - One of the best experts on this subject based on the ideXlab platform.
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evaluating progress in Radon control activities for lung cancer prevention in national comprehensive cancer control program plans 2011 2015
Journal of Community Health, 2017Co-Authors: Pascal Acree, Mary Puckett, Antonio NeriAbstract:Radon is the second leading cause of lung cancer among smokers and the leading cause among nonsmokers. The Centers for Disease Control and Prevention’s National Comprehensive Cancer Control Program (NCCCP) funds every state, seven tribes, seven territories and the District of Columbia to develop formal cancer plans that focus efforts in cancer control. A 2010 review of cancer plans identified Radon-related activities in 27 (42%) plans. Since then, 37 coalitions have updated their plans with new or revised cancer control objectives. There has also been recent efforts to increase awareness about Radon among cancer coalitions. This study assesses NCCCP grantees current Radon activities and changes since the 2010 review. We reviewed all 65 NCCCP grantee cancer plans created from 2005 to 2015 for Radon related search terms and categorized plans by Radon activities. The program’s most recent annual progress report to CDC was also reviewed. We then compared the results from the updated plans with the findings from the 2010 review to assess changes in Radon activities among cancer coalitions. Changes in state Radon laws between 2010 and 2015 were also assessed. While a number of cancer plans have added or expanded Radon-specific activities since 2010, approximately one-third of NCCCP grantees still do not include Radon in their cancer plans. Cancer programs can consider addressing Radon through partnership with existing Radon control programs to further reduce the risk of lung cancer, especially among non-smokers.
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Radon control activities for lung cancer prevention in national comprehensive cancer control program plans 2005 2011
Preventing Chronic Disease, 2013Co-Authors: Antonio Neri, Sherri L Stewart, W J AngellAbstract:INTRODUCTION Radon is the second leading cause of lung cancer among smokers and the leading cause among nonsmokers. The US Environmental Protection Agency recommends that every home be tested for Radon. Comprehensive Cancer Control (CCC) programs develop cancer coalitions that coordinate funding and resources to focus on cancer activities that are recorded in cancer plans. Radon tests, remediation, and Radon mitigation techniques are relatively inexpensive, but it is unclear whether coalitions recognize Radon as an important carcinogen. METHODS We reviewed 65 cancer plans created from 2005 through 2011 for the terms "Radon," "radiation," or "lung." Plan activities were categorized as Radon awareness, home testing, remediation, supporting Radon policy activities, or policy evaluation. We also reviewed each CCC program's most recent progress report. Cancer plan content was reviewed to assess alignment with existing Radon-specific policies in each state. RESULTS Twenty-seven of the plans reviewed (42%) had Radon-specific terminology. Improving awareness of Radon was included in all 27 plans; also included were home testing (n=21), remediation (n=11), support Radon policy activities (n=13), and policy evaluation (n=1). Three plans noted current engagement in Radon activities. Thirty states had Radon-specific laws; most (n=21) were related to Radon professional licensure. Eleven states had cancer plan activities that aligned with existing state Radon laws. CONCLUSION Although several states have Radon-specific policies, approximately half of cancer coalitions may not be aware of Radon as a public health issue. CCC-developed cancer coalitions and plans should prioritize tobacco control to address lung cancer but should consider addressing Radon through partnership with existing Radon control programs.
Jerome Guillevic - One of the best experts on this subject based on the ideXlab platform.
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a statistical evaluation of the influence of housing characteristics and geogenic Radon potential on indoor Radon concentrations in france
Journal of Environmental Radioactivity, 2013Co-Authors: Claire Demoury, Geraldine Ielsch, Denis Hemon, Olivier Laurent, Dominique Laurier, Jacqueline Clavel, Jerome GuillevicAbstract:Radon-222 is a radioactive natural gas produced by the decay of radium-226, known to be the main contributor to natural background radiation exposure. Effective risk management needs to determine the areas in which the density of buildings with high Radon levels is likely to be highest. Predicting Radon exposure from the location and characteristics of a dwelling could also contribute to epidemiological studies. Beginning in the nineteen-eighties, a national Radon survey consisting in more than 10,000 measurements of indoor Radon concentrations was conducted in French dwellings by the Institute for Radiological Protection and Nuclear Safety (IRSN). Housing characteristics, which may influence Radon accumulation in dwellings, were also collected. More recently, the IRSN generated a French geogenic Radon potential map based on the interpretation of geological features. The present study analyzed the two datasets to investigate the factors influencing indoor Radon concentrations using statistical modeling and to determine the optimum use of the information on geogenic Radon potential that showed the best statistical association with indoor Radon concentration. The results showed that the variables associated with indoor Radon concentrations were geogenic Radon potential, building material, year of construction, foundation type, building type and floor level. The model, which included the surrounding geogenic Radon potential (i.e. the average geogenic Radon potential within a disc of radius 20 km centered on the indoor Radon measurement point) and variables describing house-specific factors and lifestyle explained about 20% of the overall variability of the logarithm of Radon concentration. The surrounding geogenic Radon potential was fairly closely associated with the local average indoor Radon concentration. The prevalence of exposure to Radon above specific thresholds and the average exposures to Radon clearly increased with increasing classes of geogenic Radon potential. Combining the two datasets enabled improved assessment of Radon exposure in a given area in France.
