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Radon gas

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https://www.readbyqxmd.com/read/28863374/uptake-of-the-natural-radioactive-gas-radon-by-an-epiphytic-plant
#1
Peng Li, Ruiwen Zhang, Mintian Gu, Guiling Zheng
Radon ((222)Rn) is a natural radioactive gas and the major radioactive contributor to human exposure. The present effective ways to control Rn contamination are ventilation and adsorption with activated carbon. Plants are believed to be negligible in reducing airborne Rn. Here, we found epiphytic Tillandsia brachycaulos (Bromeliaceae) was effective in reducing airborne Rn via the leaves. Rn concentrations in the Rn chamber after Tillandsia plant treatments decreased more than those in the natural situation...
August 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28827092/development-of-the-absolute-standardization-apparatus-for-radon-222-activity
#2
Juncheng Liang, Zhijie Yang, Liyuan Wang, Zexi Li, Ming Zhang, Haoran Liu, Daqing Yuan
A defined solid angle counting apparatus for radon-222 activity absolute measurement is presented. Two home-made vacuum sealed radium-226 sources with radioactivity of 500kBq and 3MBq are used to minimize the impact from gas impurities. The defined solid angle is calculated using precisely measured geometrical parameters by several algorithms. The result from Monte Carlo simulation agrees with results obtained by other methods within the estimated uncertainty limit. Alpha particle's scattering behavior in the measurement chamber and collimator is simulated by the geant4 code and a total scattering alpha particle ratio of 0...
July 29, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28671130/association-of-radon-background-and-total-background-ionizing-radiation-with-alzheimer-s-disease-deaths-in-u-s-states
#3
Steven Lehrer, Peter H Rheinstein, Kenneth E Rosenzweig
BACKGROUND: Exposure of the brain to ionizing radiation might promote the development of Alzheimer's disease (AD). OBJECTIVE: Analysis of AD death rates versus radon background radiation and total background radiation in U.S. states. METHODS: Total background, radon background, cosmic and terrestrial background radiation measurements are from Assessment of Variations in Radiation Exposure in the United States and Report No. 160 - Ionizing Radiation Exposure of the Population of the United States...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28498931/protective-effects-of-hot-spring-water-drinking-and-radon-inhalation-on-ethanol-induced-gastric-mucosal-injury-in-mice
#4
Reo Etani, Takahiro Kataoka, Norie Kanzaki, Akihiro Sakoda, Hiroshi Tanaka, Yuu Ishimori, Fumihiro Mitsunobu, Takehito Taguchi, Kiyonori Yamaoka
Radon therapy using radon (222Rn) gas is classified into two types of treatment: inhalation of radon gas and drinking water containing radon. Although short- or long-term intake of spa water is effective in increasing gastric mucosal blood flow, and spa water therapy is useful for treating chronic gastritis and gastric ulcer, the underlying mechanisms for and precise effects of radon protection against mucosal injury are unclear. In the present study, we examined the protective effects of hot spring water drinking and radon inhalation on ethanol-induced gastric mucosal injury in mice...
May 12, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28492468/radon-mitigation-approach-in-a-laboratory-measurement-room
#5
Patricia Blanco-Rodríguez, Luis Alfonso Fernández-Serantes, Alberto Otero-Pazos, José Luis Calvo-Rolle, Francisco Javier de Cos Juez
Radon gas is the second leading cause of lung cancer, causing thousands of deaths annually. It can be a problem for people or animals in houses, workplaces, schools or any building. Therefore, its mitigation has become essential to avoid health problems and to prevent radon from interfering in radioactive measurements. This study describes the implementation of radon mitigation systems at a radioactivity laboratory in order to reduce interferences in the different works carried out. A large set of radon concentration samples is obtained from measurements at the laboratory...
May 11, 2017: Sensors
https://www.readbyqxmd.com/read/28401142/comprehensive-survey-of-household-radon-gas-levels-and-risk-factors-in-southern-alberta
#6
Fintan K T Stanley, Siavash Zarezadeh, Colin D Dumais, Karin Dumais, Renata MacQueen, Fiona Clement, Aaron A Goodarzi
BACKGROUND: The inhalation of naturally occurring radon (222Rn) gas from indoor air exposes lung tissue to α-particle bombardment, a highly mutagenic form of ionizing radiation that damages DNA and increases the lifetime risk of lung cancer. We analyzed household radon concentrations and risk factors in southern Alberta, including Calgary, the third-largest Canadian metropolis. METHODS: A total of 2382 residential homes (2018 in Calgary and 364 in surrounding townships) from an area encompassing 82% of the southern Alberta population were tested for radon, per Health Canada guidelines, for at least 90 days (median 103 d) between 2013 and 2016...
January 2017: CMAJ Open
https://www.readbyqxmd.com/read/28340370/validation-of-comet-assay-in-oregon-r-and-wild-type-strains-of-drosophila-melanogaster-exposed-to-a-natural-radioactive-environment-in-brazilian-semiarid-region
#7
Cícero Jorge Verçosa, Aroldo Vieira de Moraes Filho, Ícaro Fillipe de Araújo Castro, Robson Gomes Dos Santos, Kenya Silva Cunha, Daniela de Melo E Silva, Ana Cristina Lauer Garcia, Julio Alejandro Navoni, Viviane Souza do Amaral, Claudia Rohde
Natural radiation of geological origin is a common phenomenon in Brazil, a country where radioactive agents such as uranium may be often found. As an unstable atom, uranium undergoes radioactive decay with the generation of a series of decay by-products, including radon, which may be highly genotoxic and trigger several pathological processes, among which cancer. Because it is a gas, radon may move freely between cracks and gaps in the ground, seeping upwards into the buildings and in the environment. In this study, two Drosophila melanogaster Meigen (Diptera, Drosophilidae) strains called Oregon-R and Wild (collected in a non-radioactive environment) were exposed to atmospheric radiation in the Lajes Pintadas city, in the semiarid zone of northeastern Brazil...
July 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28324685/monitoring-and-descriptive-analysis-of-radon-in-relation-to-seismic-activity-of-northern-pakistan
#8
Zeeshan Jilani, Tahir Mehmood, Aftab Alam, Muhammad Awais, Talat Iqbal
Earthquakes are one of the major causes of natural disasters and its forecasting is challenging task. Some precursory phenomenon exists in theory in relation to earthquakes occurrence. The emission of radioactive gas named 'radon' before the earthquakes is a potential earthquake precursory candidate. The study aims to monitor and to analyze the radon in relation to seismic activity in Northern Pakistan. For this purpose RTM-2200 has been used to monitor the changes in radon concentration from August 01, 2014 to January 31, 2015 in Northern Pakistan...
June 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28249206/soil-radon-survey-to-assess-napl-contamination-from-an-ancient-spill-do-kerosene-vapors-affect-radon-partition
#9
Gabriele De Simone, Carlo Lucchetti, Francesca Pompilj, Gianfranco Galli, Paola Tuccimei, Pierpaolo Curatolo, Riccardo Giorgi
A soil radon-deficit survey was carried out in a site polluted with kerosene (Rome, Italy) in winter 2016 to assess the contamination due to the NAPL residual component in the vadose zone and to investigate the role of the vapor plume. Radon is indeed more soluble in the residual NAPL than in air or water, but laboratory experiments demonstrated that it is also preferentially partitioned in the NAPL vapors that transport it and may influence soil radon distribution patterns. Specific experimental configurations were designed and applied to a 31-station grid to test this hypothesis; two RAD7 radon monitors were placed in-series and connected to the top of a hollow probe driven up to 80-cm depth; the first instrument was directly attached to the probe and received humid soil gas, which was counted and then conveyed to the second monitor through a desiccant (drierite) cylinder capturing moisture and eventually the NAPL volatile component plus the radon dissolved in vapors...
May 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28236730/development-of-a-highly-sensitive-radon-222-amplifier-hisra-for-low-level-atmospheric-measurements
#10
Sylvain Topin, Patrick Richon, Vincent Thomas, Claire Gréau, Julie Pujos, Julien Moulin, Alexandre Hovesepian, Ludovic Deliere
Radon ((222)Rn), a radioactive gas with a half-life of 3.82 days, is continuously emanated from soil, rocks, and water by the radioactive decay of (226)Ra. Radon-222 is released from the ground into the atmosphere, where it is transported mainly by turbulent diffusion or convection. For precise measurement of radon-222 atoms in the atmosphere, the detectors typically used present a small volume or surface area and are therefore not very sensitive, especially for online measurements and short sample intervals (<1 h)...
May 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28137364/nucleoplasmic-bridges-as-a-biomarker-of-dna-damage-exposed-to-radon
#11
C Meenakshi, K Sivasubramanian, B Venkatraman
Radon is a naturally occurring radionuclide in the environment, during decay it emits high linear energy transfer (LET) alpha particles. When radon exposure is accompanied by smoking it has been reported that lung cancer risk is higher. Blood samples were collected after prior consent, 25 smokers and 25 non smokers (only males) exposed in vitro to radon gas with doses ranging between 0.3-12.6mGy Ionizing radiation is a strong clastogenic agent and a potent inducer of MN. Cytokinesis-Blocked Micro Nucleus (CBMN) assay has proven to be a reliable, thoroughly validated and standardised technique in the field of radiation biology...
February 2017: Mutation Research
https://www.readbyqxmd.com/read/28041855/study-of-a-remediated-coal-ash-depository-from-a-radiological-perspective
#12
Jácint Jónás, János Somlai, Edit Tóth-Bodrogi, Miklós Hegedűs, Tibor Kovács
Coal-fired power plants play a significant role in the production of electricity. The Ra-226 concentration of coals mined in the Ajka region can reach up to 3000 Bq/kg. This study focuses on the effects of a Hungarian (Ajka) remediated coal ash depository on the environment and the effectiveness of the cover layer. During the remediation, a method patented in Hungary was used, in which the upper layer of the depository, which had settled like concrete, was ploughed and mixed with woodchips before being planted with vegetation...
July 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28041679/low-background-gamma-ray-spectrometry-for-the-international-monitoring-system
#13
L R Greenwood, M G Cantaloub, J L Burnett, A W Myers, C T Overman, J B Forrester, B G Glasgow, H S Miley
PNNL has developed two low-background gamma-ray spectrometers in a new shallow underground laboratory, thereby significantly improving its ability to detect low levels of gamma-ray emitting fission or activation products in airborne particulate in samples from the IMS (International Monitoring System). The combination of cosmic veto panels, dry nitrogen gas to reduce radon and low background shielding results in a reduction of the background count rate by about a factor of 100 compared to detectors operating above ground at our laboratory...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28033101/radon-measurements-in-well-and-spring-water-of-the-tuzla-area-bosnia-and-herzegovina
#14
Amela Kasić, Amira Kasumović, Feriz Adrović, Muhamed Hodžić
Investigations of natural radioactivity in water, air, and soil are conducted frequently and routinely. Exposure to high concentrations of natural radioactive radon gas can cause irradiation of respiratory organs, which can lead to lung cancer. This paper presents measurements of radon activity concentrations in dug wells and natural springs of the Tuzla area (Bosnia and Herzegovina), which ranged from 214 to 3702 mBq L-1. Our results have shown that the radon activity concentration did not exceed the EU reference level for radon in drinking water (100 Bq L-1)...
December 1, 2016: Arhiv za Higijenu Rada i Toksikologiju
https://www.readbyqxmd.com/read/27984708/a-primary-standard-source-of-radon-222-based-on-the-hpge-detector
#15
M Y A Mostafa, M Vasyanovich, M Zhukovsky
The present paper describes the prototype of a calibration standard system for radon concentrations to be used in establishing the traceability of radon concentration measurements in dwellings. Radon gas was generated with a radium-226 solid source in a certified volume as a closed system. The activity of the radon that was released in the closed system was determined from the difference between the absolute activity of the standard radium solid source and the residual radon decay products ((214)Bi or (214)Pb)...
February 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/27983613/association-of-school-district-policies-for-radon-testing-and-radon-resistant-new-construction-practices-with-indoor-radon-zones
#16
Stephanie Foster, Sherry Everett Jones
Radon is a naturally occurring, colorless, odorless, and tasteless radioactive gas. Without testing, its presence is unknown. Using nationally representative data from the 2012 School Health Policies and Practices Study, we examined whether the prevalence of school district policies for radon testing and for radon-resistant new construction practices varied by district location in relation to the U.S. Environmental Protection Agency Map of Radon Zones. Among school districts located in counties with high predicted average indoor radon, 42...
December 13, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27939079/radon-and-thoron-inhalation-doses-in-dwellings-with-earthen-architecture-comparison-of-measurement-methods
#17
Oliver Meisenberg, Rosaline Mishra, Manish Joshi, Stefanie Gierl, Rajeswari Rout, Lu Guo, Tarun Agarwal, Sandeep Kanse, Josef Irlinger, Balvinder K Sapra, Jochen Tschiersch
The radioactive noble gas radon ((222)Rn) and its decay products have been considered a health risk in the indoor environment for many years because of their contribution to the radiation dose of the lungs. The radioisotope thoron ((220)Rn) and its decay products came into focus of being a health risk only recently. The reason for this is its short half-life, so only building material can become a significant source for indoor thoron. In this study, dwellings with earthen architecture were investigated with different independent measurement techniques in order to determine appropriate methods for reliable dose assessment of the dwellers...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27843065/measuring-radon-222-in-soil-gas-with-high-spatial-and-temporal-resolution
#18
Darren Huxtable, David Read, George Shaw
In order to exploit (222)Rn as a naturally-occurring tracer in soils we need to sample and measure radon isotopes in soil gas with high spatial and temporal resolution, without disturbing in situ activity concentrations and fluxes. Minimisation of sample volume is key to improving the resolution with which soil gas can be sampled; an analytical method is then needed which can measure radon with appropriate detection limits and precision for soil gas tracer studies. We have designed a soil gas probe with minimal internal dead volume to allow us to sample soil gas volumes of 45 cm(3)...
February 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27815431/leukaemia-mortality-and-low-dose-ionising-radiation-in-the-wismut-uranium-miner-cohort-1946-2013
#19
Michaela Kreuzer, Christina Sobotzki, Nora Fenske, James W Marsh, Maria Schnelzer
OBJECTIVES: To examine the risk of death from leukaemia in relation to occupational chronic low-level external and internal radiation exposure in a cohort of 58 972 former German uranium miners with mortality follow-up from 1946 to 2013. METHODS: The red bone marrow (RBM) dose from low-linear energy transfer (LET) (mainly external γ-radiation) and high-LET (mainly radon gas) radiation was estimated based on a job-exposure matrix and biokinetic/dosimetric models...
March 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27807784/public-exposure-to-radioactivity-levels-in-the-lebanese-environment
#20
O El Samad, R Baydoun, M Aoun, W Zaidan, H El Jeaid
In the framework of a National Environmental Radiation Survey Program, a total of 950 samples were collected and analyzed over 7 years. The program covers different compartment of Lebanese environment, rivers, wells, marine samples, soil, and foodstuff. Air was monitored continuously through a radiation early warning network system. Data collected from 2009 to 2015 are presented in this work. Gross alpha/gross beta values in well samples were below the guidance levels stated by the WHO. Cesium-137 was detected in milk samples, whey, and jam...
January 2017: Environmental Science and Pollution Research International
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