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Karl-Heinz Hellmuth, Marja Siitari-Kauppi, Hannu Arvela, Antero Lindberg, Lionel Fonteneau, Paul Sardini
Radon emanation from intact samples of fresh ("BG"), altered ("Fract") and disturbed ("EDZ") Finnish granitic rock from Kuru (Finland) and its dependence on humidity and rock structural factors was studied. The pore network of the rock was characterized by microscopy and impregnation with (14)C-PMMA (polymethylmethacrylate) resin and autoradiography. The radon emanation factor was increasing linearly with the relative humidity. (14)C-PMMA autoradiography of the altered zones and the EDZ indicated significant, mineral-specific increase of porosity and porosity gradients towards the fracture surfaces (Fract) and microcracks within the EDZ...
June 13, 2017: Applied Radiation and Isotopes
Christian Riesch, Günter Radons, Robert Magerle
We investigate the non-equilibrium dynamics of an ordered stripe-forming system free of topological defects. In particular, we study the ageing and the coarsening of orientation fluctuations parallel and perpendicular to the stripes via computer simulations based on a minimal phase-field model (model B with Coulomb interactions). Under the influence of noise, the stripe orientation field develops fluctuations parallel to the stripes, with the dominant modulation length λ*∥ increasing with time t as λ*∥ ∼ t(1/4) and the correlation length perpendicular to the stripes ξ(⊥)θ increasing as ξ(⊥)θ ∼ t(1/2)...
August 6, 2017: Interface Focus
Renyuan Zhang, Siyang Cao
In this paper, a new millimeter wave 3D imaging radar is proposed. The user just needs to move the radar along a circular track, and high resolution 3D imaging can be generated. The proposed radar uses the movement of itself to synthesize a large aperture in both the azimuth and elevation directions. It can utilize inverse Radon transform to resolve 3D imaging. To improve the sensing result, the compressed sensing approach is further investigated. The simulation and experimental result further illustrated the design...
June 17, 2017: Sensors
Ángeles Rodríguez-Martínez, Alberto Ruano-Ravina, María Torres-Durán, Iria Vidal-García, Virginia Leiro-Fernández, Jesús Hernández-Hernández, Silvia García-García, Mariano Provencio, Olalla Castro-Añón, Isaura Parente-Lamelas, Ihab Abdulkader, José Abal-Arca, Carmen Montero-Martínez, Margarita Amenedo, Rosirys Guzmán-Taveras, Alberto Fernández-Villar, Juan Miguel Barros-Dios
INTRODUCTION: Small cell lung cancer (SCLC) is the most aggressive histologic type of lung cancer, and accounts for approximately 10%-15% of all cases. Few studies have analyzed the effect of residential radon. Our aim is to determine the risk factors of SCLC. METHODS: We designed a multicenter, hospital-based case-control study with the participation of 11 hospitals in 4 autonomous communities. RESULTS: Results of the first 113 cases have been analyzed, 63 of which included residential radon measurements...
June 13, 2017: Archivos de Bronconeumología
Nadine Erbeldinger, Felicitas Rapp, Svetlana Ktitareva, Philipp Wendel, Anna S Bothe, Till Dettmering, Marco Durante, Thomas Friedrich, Bianca Bertulat, Stephanie Meyer, M C Cardoso, Stephanie Hehlgans, Franz Rödel, Claudia Fournier
The vascular endothelium interacts with all types of blood cells and is a key modulator of local and systemic inflammatory processes, for example, in the adhesion of blood leukocytes to endothelial cells (EC) and the following extravasation into the injured tissue. The endothelium is constantly exposed to mechanical forces caused by blood flow, and the resulting shear stress is essential for the maintenance of endothelial function. Changes in local hemodynamics are sensed by EC, leading to acute or persistent changes...
2017: Frontiers in Immunology
Alberto Ruano-Ravina, Nuria Aragonés, Karl T Kelsey, Mónica Pérez-Ríos, María Piñeiro-Lamas, Gonzalo López-Abente, Juan M Barros-Dios
We aimed to know if radon concentration is associated with municipal mortality due to brain cancer in Galicia, Spain. We designed an ecological study taking as study unit Galician municipalities. To be included, municipalities had to have at least three radon measurements. We correlated radon concentrations with municipal mortality due to these malignant tumors during the period 1999-2008. We calculated the relative risk of dying of brain cancers for each municipality and correlated this value with municipal radon concentration using Spearman's Rho...
June 15, 2017: Scientific Reports
Reshma Bhaskaran, Ravikumar C Damodaran, Visnuprasad Ashok Kumar, Jojo Panakal John, Danalakshmi Bangaru, Chitra Natarajan, Bala Sundar Sathiamurthy, Jose Mundiyanikal Thomas, Rosaline Mishra
Among radiation exposure pathways to human beings, inhalation dose is the most prominent one. Radon, thoron, and their progeny contribute more than 50 per cent to the annual effective dose due to natural radioactivity. South west coast of India is classified as a High Natural Background Radioactivity Area and large scale data on natural radioactivity and dosimetry are available from these coastal regions including the Neendakara-Chavara belt in the south of Kerala. However, similar studies and reports from the northern part of Kerala are scarce...
2017: Journal of Environmental and Public Health
María Lorenzo-González, A Ruano-Ravina, Joaquín Peón, María Piñeiro, Juan Barros-Dios
Residential radon exposure is a major public health problem. It is the second greatest cause of lung cancer, after smoking, and the greatest in never-smokers. This study shows the indoor radon exposure distribution in Galicia and estimates the percentage of dwellings exceeding reference levels. It is based on 3,245 residential radon measurements obtained from the Galician Radon Map project and from controls of two previous case-control studies on residential radon and lung cancer. Results show a high median residential radon concentration in Galicia (99 Bq/m3), with 49...
June 13, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
Jun Wang, Laurent Dumartin, Andrea Mafficini, Pinar Ulug, Ajanthah Sangaralingam, Namaa Audi Alamiry, Tomasz P Radon, Roberto Salvia, Rita T Lawlor, Nicholas R Lemoine, Aldo Scarpa, Claude Chelala, Tatjana Crnogorac-Jurcevic
Despite a wealth of genomic information, a comprehensive alternative splicing (AS) analysis of pancreatic ductal adenocarcinoma (PDAC) has not been performed yet. In the present study, we assessed whole exome-based transcriptome and AS profiles of 43 pancreas tissues using Affymetrix exon array. The AS analysis of PDAC indicated on average two AS probe-sets (ranging from 1-28) in 1,354 significantly identified protein-coding genes, with skipped exon and alternative first exon being the most frequently utilised...
June 7, 2017: Scientific Reports
Jaeryong Yoo, Young-Woo Jin, Kwang Pyo Kim
Most internal radiation dose resulting from natural radionuclides is due to radon and radioactive potassium. Total body potassium (TBK) in human body may vary by ethnic group, gender and age. The objective of this study was to measure TBK and body potassium concentration in Korean subjects. Body potassium concentrations of the subjects were measured with a whole-body counter for 283 adult males and 181 adult females. Average TBK value and body potassium level were 111.2 g and 1.5 g kg-1 for males, while for females they were 71...
June 7, 2017: Radiation Protection Dosimetry
Leeka Kheifets, John Swanson, Yingzhe Yuan, Cynthia Kusters, Ximena Vergara
In this paper we compare the findings of epidemiologic studies of childhood leukemia that examined at least two of ELF magnetic fields and/or distance to power lines, and exposure to radon and gamma radiation or distance to nuclear plants. Many of the methodologic aspects are common to studies of non-ionising (i.e. ELF-MF) and ionising radiation. A systematic search and review of studies with more than one exposure under study identified 33 key and 35 supplementary papers from ten countries that have been included in this review...
June 6, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
Anna Ilar, Nils Plato, Marie Lewné, Göran Pershagen, Per Gustavsson
We investigated occupational exposure to diesel motor exhaust (DME) and the risk of lung cancer by histological subtype among men, using elemental carbon (EC) as a marker of DME exposure. 993 cases and 2359 controls frequency-matched on age and year of study inclusion were analyzed by unconditional logistic regression in this Swedish case-control study. Work and smoking histories were collected by a questionnaire and telephone interviews. DME was assessed by a job-exposure matrix. We adjusted for age, year of study inclusion, smoking, occupational exposure to asbestos and combustion products (other than motor exhaust), residential exposure to radon and exposure to air pollution from road traffic...
June 5, 2017: European Journal of Epidemiology
Katarzyna Walczak, Jerzy Olszewski, Piotr Politański, Marek Zmyślony
OBJECTIVES: Radon concentrations for 31 Polish underground tourist routes were analyzed. The equivalent dose to the lung, the effective dose and the relative risk were calculated for employees of the analyzed routes on the grounds of information on radon concentrations, work time, etc. MATERIAL AND METHODS: The relative risk for lung cancers was calculated using the Biological Effects of Ionizing Radiation (BEIR) VI Committee model. Equivalent doses to the lungs of workers were determined using the coefficients calculated by the Kendall and Smith...
January 18, 2017: International Journal of Occupational Medicine and Environmental Health
Songül Akbulut Özen, Necati Celik, Emrehan Dursun, Halim Taskın
In this study, indoor and outdoor radon ((222)Rn) surveys were carried out in the summer and winter seasons in homes of one hundred lung cancer patients in the year 2013-2014. The aim was to investigate the relationship between radon and cancer patients. Lung cancer patients completed a questionnaire concerning their living environment, various physical parameters and living habits. Pearson correlation and t tests revealed no meaningful results between radon concentrations, on one hand, and environmental and personal living habits, on the other hand...
June 2, 2017: Environmental Geochemistry and Health
Yangzhou Gan, Zeyang Xia, Jing Xiong, Guanglin Li, Qunfei Zhao
Three-dimensional (3D) models of tooth-alveolar bone complex are needed in treatment planning and simulation for computer-aided orthodontics. Tooth and alveolar bone segmentation from computed tomography (CT) images is a fundamental step in reconstructing their models. Due to less application of alveolar bone in conventional orthodontic treatment which may cause undesired side effects, the previous studies mainly focused on tooth segmentation and reconstruction and did not consider the alveolar bone. In this study, we proposed a method to implement both tooth and alveolar bone segmentation from dental CT images for reconstructing their 3D models...
May 29, 2017: IEEE Journal of Biomedical and Health Informatics
Juliana P Sá, Pedro T B S Branco, Maria C M Alvim-Ferraz, Fernando G Martins, Sofia I V Sousa
Indoor air pollution mitigation measures are highly important due to the associated health impacts, especially on children, a risk group that spends significant time indoors. Thus, the main goal of the work here reported was the evaluation of mitigation measures implemented in nursery and primary schools to improve air quality. Continuous measurements of CO₂, CO, NO₂, O₃, CH₂O, total volatile organic compounds (VOC), PM₁, PM2.5, PM10, Total Suspended Particles (TSP) and radon, as well as temperature and relative humidity were performed in two campaigns, before and after the implementation of low-cost mitigation measures...
May 31, 2017: International Journal of Environmental Research and Public Health
Patricia A Scofield, Linda L Smith, David N Johnson
The U.S. Environmental Protection Agency promulgated national emission standards for emissions of radionuclides other than radon from US Department of Energy facilities in Chapter 40 of the Code of Federal Regulations (CFR) 61, Subpart H. This regulatory standard limits the annual effective dose that any member of the public can receive from Department of Energy facilities to 0.1 mSv. As defined in the preamble of the final rule, all of the facilities on the Oak Ridge Reservation, i.e., the Y-12 National Security Complex, Oak Ridge National Laboratory, East Tennessee Technology Park, and any other U...
July 2017: Health Physics
Wei Jia, Bob Zhang, Jingting Lu, Yihai Zhu, Yang Zhao, Wangmeng Zuo, Haibin Ling
Direction information serves as one of the most important features for palmprint recognition. In the past decade, many effective direction representation (DR)-based methods have been proposed and achieved promising recognition performance. However, due to an incomplete understanding for DR, these methods only extract DR in one direction level and one scale. Hence, they did not fully utilized all potentials of DR. In addition, most researchers only focused on the DR extraction in spatial coding domain, and rarely considered the methods in frequency domain...
May 18, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
Shuji Kojima, Mitsutoshi Tsukimoto, Noriko Shimura, Hironobu Koga, Akishisa Murata, Tsuyoshi Takara
There is considerable evidence from experimental studies in animals, as well as from clinical reports, that low-dose radiation hormesis is effective for the treatment of cancer and ulcerative colitis. In this study, we present 3 case reports that support the clinical efficacy of low-dose radiation hormesis in patients with these diseases. First, a patient with prostate cancer who had undergone surgical resection showed a subsequent increase in prostate-specific antigen (PSA). His PSA value started decreasing immediately after the start of repeated low-dose X-ray irradiation treatment and remained low thereafter...
January 2017: Dose-response: a Publication of International Hormesis Society
Jenny Schlichtiger, Johannes-Peter Haas, Swaantje Barth, Betty Bisdorff, Lisa Hager, Hartmut Michels, Boris Hügle, Katja Radon
BACKGROUND: Although several studies show that JIA-patients have significantly lower employment rates than the general population, the research on educational and occupational attainments in patients with juvenile idiopathic arthritis (JIA) remain conflicting most likely due to small sample sizes. Therefore, aim of this study is to compare the educational achievements and employment status of 3698 JIA-patients with the German general population (GGP). METHODS: "SEPIA" was a large cross-sectional study on the current status of a historic cohort of JIA-patients treated in a single center between 1952 and 2010...
May 22, 2017: Pediatric Rheumatology Online Journal
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