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Radon gas

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https://www.readbyqxmd.com/read/27843065/measuring-radon-222-in-soil-gas-with-high-spatial-and-temporal-resolution
#1
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)...
November 11, 2016: 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
#2
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...
November 4, 2016: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27807784/public-exposure-to-radioactivity-levels-in-the-lebanese-environment
#3
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...
November 2, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27765433/residential-soil-and-water-radon-surveys-in-north-western-part-of-romania
#4
Alexandra Cucoş Dinu, Botond Papp, Tiberius Dicu, Mircea Moldovan, Denissa Bety Burghele, Ionuţ Tudor Moraru, Ancuţa Tenţer, Constantin Cosma
The exposure to radon and radon decay products in homes and at workplaces represents the greatest risk from natural ionizing radiation. The present study brings forward the residential, soil and water radon surveys in 5 counties of Romania. Indoor radon measurements were performed by using CR-39 track detectors exposed for 3 months on ground-floor level of dwellings, according to the NRPB Measurements Protocol. Radon concentrations in soil and water were measured using the LUK3C device. The indoor radon concentrations ranged from 5 to 2592 Bq⋅m(-3) with an updated preliminary arithmetic mean of 133 Bq⋅m(-3), and a geometric mean of 90 Bq⋅m(-3)...
January 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27696229/radon-levels-in-romanian-caves-an-occupational-exposure-survey
#5
Alexandra Cucoş Dinu, Monica I Călugăr, Bety D Burghele, Oana A Dumitru, Constantin Cosma, Bogdan P Onac
A comprehensive radon survey has been carried out in seven caves located in the western half of Romania's most significant karst regions. Touristic and non-touristic caves were investigated with the aim to provide a reliable distribution of their radon levels and evaluate the occupational exposure and associated effective doses. Radon gas concentrations were measured with long-term diffusion-type detectors during two consecutive seasons (warm and cold). All investigated caves exceed the European Union reference level of radon gas at workplaces (300 Bq/m(3))...
October 1, 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/27693159/effects-of-etching-time-on-alpha-tracks-in-solid-state-nuclear-track-detectors
#6
Gavin Gillmore, David Wertheim, Simon Crust
Solid State Nuclear Track Detectors (SSNTDs) are used extensively for monitoring alpha particle radiation, neutron flux and cosmic ray radiation. Radon gas inhalation is regarded as being a significant contributory factor to lung cancer deaths in the UK each year. Gas concentrations are often monitored using CR39 based SSNTDs as the natural decay of radon results in alpha particles which form tracks in these detectors. Such tracks are normally etched for about 4h to enable microscopic analysis. This study examined the effect of etching time on the appearance of alpha tracks in SSNTDs by collecting 2D and 3D image datasets using laser confocal microscope imaging techniques...
September 29, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27681529/spanish-experience-on-the-design-of-radon-surveys-based-on-the-use-of%C3%A2-geogenic-information
#7
C Sainz Fernández, L S Quindós Poncela, A Fernández Villar, I Fuente Merino, J L Gutierrez-Villanueva, S Celaya González, L Quindós López, J Quindós López, E Fernández, J Remondo Tejerina, J L Martín Matarranz, M García Talavera
One of the requirements of the recently approved EU-BSS (European Basic Safety Standards Directive, EURATOM, 2013) is the design and implementation of national radon action plans in the member states (Annex XVIII). Such plans require radon surveys. The analysis of indoor radon data is supported by the existing knowledge about geogenic radiation. With this aim, we used the terrestrial gamma dose rate data from the MARNA project. In addition, we considered other criterion regarding the surface of Spain, population, permeability of rocks, uranium and radium contain in soils because currently no data are available related to soil radon gas concentration and permeability in Spain...
January 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27638101/estimation-of-the-radon-production-rate-in-granite-rocks-and-evaluation-of-the-implications-for-geogenic-radon-potential-maps-a-case-study-in-central-portugal
#8
A Pereira, R Lamas, M Miranda, F Domingos, L Neves, N Ferreira, L Costa
The goal of this study was to estimate radon gas production rate in granitic rocks and identify the factors responsible for the observed variability. For this purpose, 180 samples were collected from pre-Hercynian and Hercynian rocks in north and central Portugal and analysed for a) (226)Ra activity, b) radon ((222)Rn) per unit mass activity, and c) radon gas emanation coefficient. On a subset of representative samples from the same rock types were also measured d) apparent porosity and e) apparent density...
January 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27594727/mapping-radon-hazard-areas-using-238-u-measurements-and-geological-units-a-study-in-a-high-background-radiation-city-of-china
#9
Hongtao Liu, Nanping Wang, Xingming Chu, Ting Li, Ling Zheng, Shouliang Yan, Shijun Li
In order to identify radon-prone areas and evaluate radon risk level, a soil gas radon survey combined with gamma-ray spectrometry measurements was carried out in Shenzhen City, south China. Meanwhile, the statistical analysis was applied to evaluate the distribution of measured results. This paper presents the methodology of the radon risk assessment. A radon risk map was accomplished based on a combination of soil gas radon concentration (RC), soil air permeability (Perm.) and uranium ((238)U) concentration...
2016: Journal of Radioanalytical and Nuclear Chemistry
https://www.readbyqxmd.com/read/27566356/a-novel-detection-of-radon-based-on-its-decay-product-inducing-conformational-changes-of-an-aptamer-probe
#10
Minzhi Long, Han Deng, Gang Tian, Chunli Song, Hongwen Liu, Yi Shen, Changyin Lv
This study proposes a novel method for the detection of inert gas radon using a label-free, specific, fluorescence-sensing aptamer in the context of PW17-OG system. This method utilizes the cyanine dye OliGreen (OG) as a signal reactor and the aptamer PW17 as a fluorescent identification probe. When OG integrates into the free curling PW17, a strong fluorescence signal is generated. After radon decays, the long lived naturally occurring radon progeny Pb being disposed and introduced to the system. Lead ions induce PW17 to form a stable G-quadruplex, thereby inhibiting the interaction between OG and PW17 and resulting in a reduction of the fluorescence intensity...
September 14, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27522328/radon-in-soil-gas-in-kosovo
#11
Dafina Kikaj, Zvonka Jeran, Meleq Bahtijari, Peter Stegnar
An assessment of the radiological situation due to exposure to radon and gamma emitting radionuclides was conducted in southern Kosovo. This study deals with sources of radon in soil gas. A long-term study of radon concentrations in the soil gas was carried out using the SSNTDs (CR-39) at 21 different locations in the Sharr-Korabi zone. The detectors were exposed for an extended period of time, including at least three seasonal periods in a year and the sampling locations were chosen with respect to lithology...
November 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27522045/the-influence-of-radon-gas-and-progeny-and-weather-conditions-on-ambient-dose-equivalent-rate
#12
J L Márquez, G Benito, J C Saez, N Navarro, A Alvarez, J Quiñones
The purpose of this study is to identify the influence of radon (gas and progeny) on the ambient dose equivalent rate measured at the reference station ESMERALDA, where continuous measurements of the ambient dose equivalent rate (every 10 min) combined with activity concentration measurements of radon gas and radon progeny as well as meteorological parameters have been collected. This study has been performed using a correlation study based on a principal components analysis and the Spearman's rank correlation coefficient...
August 13, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27504164/estimation-of-the-residential-radon-levels-and-the-annual-effective-dose-in-dwellings-of-shiraz-iran-in-2015
#13
Maryam Yarahmadi, Abbas Shahsavani, Mohammad Hassan Mahmoudian, Narges Shamsedini, Noushin Rastkari, Majid Kermani
INTRODUCTION: Radon is the second most important cause of lung cancer after smoking. Thus, the determination of indoor radon concentrations in dwellings and workplaces is an important public health concern. The purpose of this research was to measure the concentration of radon gas in residential homes and public places in the city of Shiraz and its relationship with the type and age of the buildings as well as the type of materials used to construct the building (brick, block). We also determined the radon dosages that occupants of the building would receive...
June 2016: Electronic Physician
https://www.readbyqxmd.com/read/27474991/geogenic-and-anthropogenic-impacts-on-indoor-radon-in-the-techa-river-region
#14
I Yarmoshenko, G Malinovsky, A Vasilyev, A Onischenko, A Seleznev
Indoor radon concentration was studied in the 14 settlements located near the Techa River, which was contaminated by radioactive wastes in 1950-s. Results of the radon survey were used for analysis of the relationship between the indoor radon and main geologic factors (Pre-Jurassic formations, Quaternary sediments and faults), local geogenic radon potential and anthropogenic factors. Main influencing factors explain 58% of the standard deviation of indoor radon concentration. Association of the air exchange influence over radon concentration with underlying geological media was related to different contributions of geogenic advective and diffusive radon entries...
November 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27355348/variation-in-the-radon-concentrations-and-outdoor-gamma-radiation-levels-in-relation-to-different-geological-formations-in-the-thermal-regions-of-bursa-turkey
#15
Gizem Akkaya, Ayşegül Kahraman, Abdullah Koray, Gökay Kaynak
Spring waters used as spas and their region may contain significant amounts of natural radionuclides. The main sources of exposure are the inhalation of radon and its decay products released from the water and soil and terrestrial gamma-radiation. In order to evaluate the potential risk of thermal regions in Bursa, located in the impact area of the NAF (North Anatolian Fault), radon and thoron concentrations in soil gas, radon concentrations in thermal waters and outdoor gamma radiation levels were measured in thermal regions that have different geological formations...
September 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27343029/modeling-of-geogenic-radon-in-switzerland-based-on-ordered-logistic-regression
#16
Georg Kropat, François Bochud, Christophe Murith, Martha Palacios Gruson, Sébastien Baechler
PURPOSE: The estimation of the radon hazard of a future construction site should ideally be based on the geogenic radon potential (GRP), since this estimate is free of anthropogenic influences and building characteristics. The goal of this study was to evaluate terrestrial gamma dose rate (TGD), geology, fault lines and topsoil permeability as predictors for the creation of a GRP map based on logistic regression. METHOD: Soil gas radon measurements (SRC) are more suited for the estimation of GRP than indoor radon measurements (IRC) since the former do not depend on ventilation and heating habits or building characteristics...
January 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27333076/radon-emissions-from-natural-gas-power-plants-at-the-pennsylvania-state-university
#17
Alison G Stidworthy, Kenneth J Davis, Jeff Leavey
Implications Statement Radon measurements at sites surrounding power plants that utilize natural gas did not indicate that the radon concentrations originated from the plants' emissions. There were elevated radon concentrations in the natural gas supply flowing into the power plants, but combustion dilution puts the concentration below EPA action levels coming out of the stack, so no hazardous levels were expected downwind. Power plant combustion of natural gas is not likely to pose a radiation health hazard unless very different gas radon concentrations or combustion dilution ratios are encountered...
June 22, 2016: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/27323211/development-of-a-mobile-radioxenon-processing-system-for-on-site-inspections-and-the-deployment-in-ife14
#18
Chongyang Zhou, Guoqing Zhou, Shujuan Feng, Dingwei Huang, Xinhua Zhao, J S Elisabeth Wieslander, Kirill Khrustalev, Xiaolong Yu, Ziwei Cheng, Rui Wu, Ronghu Zou
A mobile radioxenon gas processing system (XESPM-III) was developed for on-site inspections-targeting deployment in the Integrated Field Exercise in Jordan 2014 (IFE14)-in order to monitor radioxenon isotopes ((131m,133,133m,135)Xe) from the subsoil and atmosphere. XESPM-III is composed of primarily three units, the sampling unit, the purification unit and finally the quantification unit. The function of the sampling unit is to pre-enrich xenon by removal of impurities in the gas sample, while the purification unit further purifies, separates impurities and prepares a small-volume sample with relatively high concentration of xenon gas-both stable and radioactive xenon (if present)...
October 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27315448/interpreting-short-and-medium-exposure-etched-track-radon-measurements-to-determine-whether-an-action-level-could-be-exceeded
#19
A R Denman, R G M Crockett, C J Groves-Kirkby, P S Phillips
Radon gas is naturally occurring, and can concentrate in the built environment. It is radioactive and high concentration levels within buildings, including homes, have been shown to increase the risk of lung cancer in the occupants. As a result, several methods have been developed to measure radon. The long-term average radon level determines the risk to occupants, but there is always pressure to complete measurements more quickly, particularly when buying and selling the home. For many years, the three-month exposure using etched-track detectors has been the de facto standard, but a decade ago, Phillips et al...
October 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27257076/chromosome-thripsis-by-dna-double-strand-break-clusters-causes-enhanced-cell-lethality-chromosomal-translocations-and-53bp1-recruitment
#20
Agnes Schipler, Veronika Mladenova, Aashish Soni, Vladimir Nikolov, Janapriya Saha, Emil Mladenov, George Iliakis
Chromosome translocations are hallmark of cancer and of radiation-induced cell killing, reflecting joining of incongruent DNA-ends that alter the genome. Translocation-formation requires DNA end-joining mechanisms and incompletely characterized, permissive chromatin conditions. We show that chromatin destabilization by clusters of DNA double-strand-breaks (DSBs) generated by the I-SceI meganuclease at multiple, appropriately engineered genomic sites, compromises c-NHEJ and markedly increases cell killing and translocation-formation compared to single-DSBs...
September 19, 2016: Nucleic Acids Research
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