Science topic

# Radon - Science topic

A naturally radioactive element with atomic symbol Rn, atomic number 86, and atomic weight 222. It is a member of the noble gas family found in soil, and is released during the decay of radium.

Publications related to Radon (10,000)

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The Terahertz (THz) time domain computed tomography (CT) system was used for evaluating kernel weight and plumpness of sunflower seed in present study. Specifically, a series of THz projections of the sunflower seed on a rotation stage were captured by a customized transmission mode THz time domain imaging system from different angles. These projec...

Small cell lung cancer (SCLC) comprises approximately 10% of all lung cancer cases. Tobacco is its main risk factor; however, occupation might play a role in this specific lung cancer subtype. The effect of occupation on SCLC risk has been hardly studied and therefore we aim to assess the role of occupation on the risk of SCLC. To do this, we desig...

A natural cave environment subject to regular human visitation was selected for aerobiological study to minimize the effects of severe temperature fluctuations, UV radiation, and desiccation stress on the aerobiome. The longer sampling period of bioaerosols, up to 22 months, was generally not associated with a proportionally incremental and cumulat...

Inertia Axes are involved in many techniques for image content measurement when involving information obtained from lines, angles, centroids... etc. We investigate, here, the estimation of the main axis of inertia of an object in the image. We identify the coincidence conditions of the Scale Space Radon Transform (SSRT) maximum and the inertia main...

The AP-Henstock-Kurzweil-type integral is defined on X, where X is a complete measure metric space. We present some properties of the integral, continuing the study's use of a Radon measure µ. Finally, using locally finite measures, we extend the AP-Henstock-Kurzweil integral theory to second countable Hausdorff spaces that are locally compact. A S...

Radon-222 (Rn-222) exhalation rate is vital for estimating radiation risk from many kinds of materials. AlphaGUARD measures the radon concentration based on the ionization chamber principle, which is currently recognized as a reference instrument to measure radon. In China, measurements of radon exhalation rate are performed by AlphaGUARD operated...

The Radon transform constitutes the conventional tool for tomosynthesis, i.e., the composition of cross-sections of an object from its projections. It is actually a version of the Fourier Transform, which is accompanied by the appropriate digital high pass filters for correct distribution of energy among the reconstructed frequency components. The...

The article presents the following: the results of deformation monitoring by GNSS tools at the FSUE Radon radioactive waste disposal site (Moscow oblast); a brief history of the development of the geodynamic observation network at the industrial site of Radon. the results and geodynamic interpretation of GNSS observations of Earth surface movements...

In this paper we develop explicit and semi-implicit second-order high-resolution finite difference schemes for a structured coagulation-fragmentation model formulated on the space of Radon measures. We prove the convergence of each of the two schemes to the unique weak solution of the model. We perform numerical simulations to demonstrate that the...

Mining generates significant amounts of waste that can represent a source of contamination for areas close to the extraction area, generating a negative impact both on the environment and the health of people. This study aims to evaluate the radiological risk derived from exposure to natural radionuclides contained in tailings from Peruvian gold mi...

This work shows how the ideas of the Compressive Sensing (CS) theory help us create economic time-lapse seismic acquisitions by randomly allocating a smaller number of sources and/or receivers and relaxing the survey replication. The framework was applied to synthetic 2D time-lapse data that mimics a marine seismic acquisition. We modeled two subsa...

Radon exhalation from uranium tailings has seriously affected environmental safety and human health. Many uncertain parameters, such as diffusion coefficient, porosity, percolation rate, material particle size, etc., are related to the diffusion and migration of radon. Moreover, cover materials, cover layers, and cover thickness are the main instru...

The tropical glaciers of the Cordillera Blanca have played host to some of the most significant mass movements ever recorded in the world and Peru; many proglacial lakes formed in this mountain range have natural dikes made of moraine material, which, if they collapse, would present a risk for the cities located downstream of a proglacial lake, whe...

There has been a growing interest in the effect of radon gas on humans visiting caves. A radon survey was consequently done in the Sudwala tourist cave close to Nelspruit in the eastern part of South Africa to determine the radon exposure of tourists and guides. The Sudwala cave, which evolved in karst geology, is a popular tourist destination. Twe...

Soil radon gas concentrations ranging from the detection limit up to 15 kBq/m3 were measured for the first time at the Kilbourne Hole maar in two selected regions: the first region was located on the western volcanic field, and the second was located inside the crater, near the southern border. Radioactive anomalies were found in association with t...

Annotation:In this article the geographical basis of mineral springs is covered and the scientific basis for the research of mineral springs in Uzbekistan is revealed. There are the decree of the Cabinet Ministers of the Republic of Uzbekistan dated June27, 2017 "On measures of adjustment of utilizing underground waters" and the statue of Cabinet M...

The etiologies of Parkinson’s disease (PD) remain unclear. Some, such as certain genetic mutations and head trauma, are widely known or easily identified. However, these causes or risk factors do not account for the majority of cases. Other, less visible factors must be at play. Among these is a widely used industrial solvent and common environment...

The belief that Peninsular India is largely aseismic received yet another severe jolt with the onset of Killari earthquake on September 30,1993 at 3:55:49.5 IST, with the magnitude measuring 6.3 on Richter Scale (IX on Modified Mercalli (MM) Intensity scale).
Geological and geotechnical studies in Killari area revealed that a highly damaged zone (h...

Submarine groundwater discharge (SGD) is an important driver of coastal biogeochemical budgets worldwide. Radon (²²²Rn) has been widely used as a natural geochemical tracer to quantify SGD, but field measurements are time consuming and costly. Here, we use deep learning to predict coastal seawater radon in SGD‐impacted regions. We hypothesize that...

This paper will deal with differentiability properties of the class of Hellinger–Kantorovich distances HKΛ,Σ(Λ,Σ>0)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text...

Indoor radon is a natural radioactive gas and is one of the leading causes of lung cancer. Despite multiple policy and communication interventions to increase radon testing and mitigation, the uptake of these measures remains insufficient. A participatory research design was applied in Belgium and Slovenia to probe the barriers and facilitators hom...

Bu çalışmada, Malatya ilinde çeşitli bölgelerden alınan kaynak sularında, radon konsantrasyonları (CRn), sindirim ve solunum başına ortalama yıllık etkin doz değerleri (Eing ve Einh) ile toplam yıllık etkin doz miktarları (ET) ve midenin maruz kaldığı yıllık etkin doz miktarları (SED) hesaplanmıştır. Bu amaçla, CR-39 pasif nükleer iz detektörleri k...

This study analyses the radon gas content in (17) samples taken from buildings of the College of Women's Education - Tikrit University. Using a long-term measuring approach and a nuclear effect detector, the effects of radon's alpha particles were measured (CR-39). Radon concentrations were discovered to fluctuate, with the greatest levels being fo...

Time series of seismic noises, geomagnetic variations, volumetric activity of radon of surface layer of atmosphere were investigated. The data were obtained by geophysical complexes conducting monitoring measurements in the territory of the Republic of Karelia. For time series recorded under conditions of low seismic and geomagnetic activity, their...

Water is an integral part of the reproduction of flora and fauna and covers almost 71.4% of the Earth’s surface area. It undergoes various chemical, thermal and physical changes due to man-made and natural hazard which deteriorate the quality of water. In order to monitor the quality of water, a consistent monitoring methodology is required. For th...

The aim of the study is to determine the radon concentrations in the University Hospital of Bari, Apulia Region, Southern Italy. The monitoring took place from 2017 to 2018 for a total of 402 days and included 3492 premises. Radon environmental sampling was performed with passive dosimeters of the CR-39 type. The highest mean concentration was foun...

In this work we study the self-integral of a function-measure kernel and its importance on stochastic integration. A continuous-function measure kernel $K$ over $D \subset \mathbb{R}^{d}$ is a function of two variables which acts as a continuous function in the first variable and as a real Radon measure in the second. Some analytical properties of...

The CONUS experiment is searching for coherent elastic neutrino nucleus scattering of reactor anti-neutrinos with four low-energy threshold point-contact high-purity germanium spectrometers. Excellent background suppression within the region of interest below 1 keV (ionization energy) is absolutely necessary to enable signal detection. The collecte...

We establish the following analogues of the familiar Radon and Carathéodory theorems for staircase convex sets in Rd\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mat...

2)4: 72-82 ] 2016 IJSRST | Volume 2 | Issue 4 | Print ABSTRACT Measurements of radon gas concentrations with their progeny and the annual effective dose indoors the building of Al-Mustansiriyah University College of Science-Chemistry Department have been carried out using time-integrated passive radon dosimeters and the solid state nuclear track de...

The Anninghe fault forms the eastern boundary of the Sichuan‐Yunnan block in Southwest China and has been identified as an earthquake gap zone. This study intends to construct the upper crustal shear wave velocity (Vs) structure beneath the Anninghe fault to understand its seismotectonics and potential large earthquake hazards. We deployed a dense...

Abstract We present our pathway through participation in the blind Kumamoto exercise, particularly the Step 1 of site characterization. The combination of passive and active seismic imaging techniques is used to image the velocity profile beneath the KUMA site. The estimation of the broadband Rayleigh wave dispersion curve is based on cross-correla...

Günlük hayatta doğal çevreden ve temel besinlerden temin edilen mineraller ve eser elementleri hiç sorgulamadan her an yiyor, içiyor ve soluyoruz. Bünyemize aldığımız bu doğal malzemelerle etkileşim, çoğu zaman zararsız, hatta belki faydalı olmasına karşın bazı mineraller ve eser elementlerle etkileşim yıkıcı, hatta ölümcül etkilere sahip olabilmek...

The main purpose of this study was to determine the natural radioactivity level of raw radionuclides in the metal tailings of a mine in Lhasa, Tibet, and to conduct sampling and detection in 17 typical metal tailing mines in Lhasa, Tibet. The specific activity concentrations of 226Ra, 232Th, and 40K in the samples were calculated. The total αβχγ ra...

We show that the Lipschitz-free space with the Radon--Nikod\'{y}m property and a Daugavet point recently constructed by Veeorg is in fact a dual space isomorphic to $\ell_1$. Furthermore, we answer an open problem from the literature by showing that there exists a superreflexive space, in the form of a renorming of $\ell_2$, with a $\Delta$-point....

Imaging of multiples, as a supplement to imaging of primaries, can provide a wider range of subsurface illumination. Therefore, it can provide more detailed information on subsurface structures. However, imaging of multiples suffers from crosstalk issues generated by unrelated events. Many strategies have been proposed to attenuate crosstalk, among...

Identifying groundwater (GW)-surface water (SW) interactions in riparian zones is important for assessing the transport pathways of pollutants and all potential biochemical processes, particularly in rivers with artificially controlled water levels. In this study, we constructed two monitoring transects along the nitrogen-polluted Shaying River, Ch...

Published in Hebrew, in Israeli Sociology.
Citizen science is a growing field of research and practice, in which volunteers engage in active scientific research. This paper describes citizen science ability to promote environmental awareness and social involvement using the case of the Radon Home Survey - a citizen science project for measuring and...

This study demonstrates the use of environmental tracers (Water isotopes-δ18O–δ2H, Radon-222Rn, and Electrical Conductivity-EC) as complementary tools for backtracking the water source, estimating pipe water residence time, and monitoring the instability of the water quality. Using the capital of Ethiopia, Addis Ababa, as a case study site, we demo...

Given $\alpha\in[0,1]$ and $p\in[1,+\infty]$, we define the space $\mathcal{DM}^{\alpha,p}(\mathbb R^n)$ of $L^p$ vector fields whose $\alpha$-divergence is a finite Radon measure, extending the theory of divergence-measure vector fields to the distributional fractional setting. Our main results concern the absolute continuity properties of the $\a...

Despite being not an unusual place, its prognosis is extraordinarily tough due to the general nature of pores and tone, skin, hair, and body parts. This paper presents a method to apply diverse laptop imaginative and prescient primarily based techniques (deep learning) to routinely expect the diverse varieties of pores and skin diseases. The gadget...

For a complete metric space $M$, we define the notion of a convex integral of molecules in the Lipschitz-free space $\mathcal{F}(M)$ based on the de Leeuw representation of elements of its bidual $\mathcal{F}(M)^{**}$. Using optimal transport theory, we show that convex integrals of molecules are determined by cyclical monotonicity of their support...

Given a Radon probability measure $$\mu $$ μ supported in $${\mathbb {R}}^d$$ R d , we are interested in those points x around which the measure is concentrated infinitely many times on thin annuli centered at x . Depending on the lower and upper dimension of $$\mu $$ μ , the metric used in the space and the thinness of the annuli, we obtain result...

Let Σ be a σ‐algebra of subsets of a set Ω and B(Σ)$B(\Sigma )$ be the Banach lattice of bounded Σ‐measurable real functions on Ω. For a Banach space E, we establish the relationship between a countably additive measure m:Σ→E$m:\Sigma \rightarrow E$ of finite variation |m|(Ω)$|m|(\Omega )$ with a |m|$|m|$‐Bochner integrable derivative and nuclearit...

The role of groundwater (GW) discharge on surface water (SW) quantity, quality and temperature is known to be important. Moreover, the effect of GW contributions to river thermal budgets is critical in natural rivers considering that water temperature plays a vital role in fish survival during extreme heat events. The identification of zones with G...

We consider stochastic differential equation $$ d X_t=b(X_t) dt +d W_t^H, $$ where the drift $b$ is either a measure or an integrable function, and $W^H$ is a $d$-dimensional fractional Brownian motion with Hurst parameter $H\in(0,1)$, $d\in\mathbb{N}$. For the case where $b\in L_p(\mathbb{R}^d)$, $p\in[1,\infty]$ we show weak existence of solution...

We study the variation space corresponding to a dictionary of functions in L2(Ω)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$L^2(\Omega )$$\end{document} for a bound...

One of the most common cancers to cause death worldwide is lung cancer. Lung carcinoma, another name for lung cancer, is a malignant lung tumor that is characterized by unchecked cell proliferation in lung tissues. This tumor has the potential to metastasize, or expand outside of the lung, into neighboring tissue or other sections of the body, if l...

This study investigated the role of bank return flow to two medium size rivers in southeast Queensland using a combination of hydrograph separation techniques and geochemical baseflow separations. The main aims were to provide a case study to demonstrate spatial and temporal variability in groundwater contributions to two river systems in Southeast...

Noble gases possess extremely low reactivity because their valence shells are closed. However, previous studies have suggested that these gases can form molecules when they combine with other elements with high electron affinity, such as fluorine. Radon is a naturally occurring radioactive noble gas, and the formation of radon-fluorine molecules is...

Cement-based materials manufactured from rocks and soils will release radon which is a carcinogen and affects indoor air quality. The alkaline cement-based material neutralizes with the acidic gas carbon dioxide in the air, reducing its pH value, known as carbonation. Carbonation of cement-based materials is an important environmental factor that c...

The existence of multiple reflections brings difficulty to seismic data processing and interpretation in seismic reflection exploration. Parabolic Radon transform is widely used in multiple attenuation because it is easily implemented, highly robust and efficient. However, finite seismic acquisition aperture of seismic data causes energy diffusion...

To improve ship safety and increase ship concealment, we introduce a nonconvex regularization with a Cauchy-based penalty for discussing the influence of ship parameters and speckle noise in numerically simulated SAR images. First, the Kelvin wake geometry was modeled based on the classic theory of ship wave generation. Second, the scattering echo...

The time rate of change of the indoor radon concentration is studied in a semi-empirical frame. The differential equation that describes the radon mass-balance inside a room is used, with taking into account all sources of indoor radon. Rather than solving the equation numerically, an analytical form is obtained with applying some approximations th...

This study focuses on the evolution of radon concentrations in tap water samples of primary schools in Najaf city using RAD-7 detector. Annual effective doses in children were calculated. Geographic Information System technique was used for the mapping of radon concentrations, annual effective dose (AED) for ingestion, and inhalation. Also, it is r...

The recharge of hurricane rains associated during the year 2005 caused different types of mixing of ground waters in a regional karst coastal flow system of Western Cuba. The effect was derived from isotopic evidences of the monthly monitoring of Tritium and Radon 222 activity in ground waters, conjugated with other physical and chemical variables...

This paper presents a comparative study of the quantitative estimation of ²²²Rn and its health risk from various sources in four underground uranium mines. ²²²Rn exhalation rates from uranium-bearing rocks and backfill materials were estimated by calculating the ²²²Rn concentration accumulated in an enclosed chamber into which radon was exhaled. Th...

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A healthy indoor environment is critical for children due to the severe effect of poor indoor air quality (IAQ) on their overall well-being. Day-care centres (DCCs) are important indoor microenvironments for children apart from their homes. Therefore, monitoring IAQ in this microenvironment is vital because of the vulnerability of the...

In acoustics, higher-order-in-time equations arise when taking into account a class of thermal relaxation laws in the modeling of sound wave propagation. In this work, we analyze initial boundary value problems for a family of such equations and determine the behavior of solutions as the relaxation time vanishes. In particular, we allow the leading...

Multilevel linear models allow flexible statistical modelling of complex data with different levels of stratification. Identifying the most appropriate model from the large set of possible candidates is a challenging problem. In the Bayesian setting, the standard approach is a comparison of models using the model evidence or the Bayes factor. Expli...

Common practice analysis of environmental samples is usually performed by assuming radon and its decay products from the U-Ra natural radioactive series are uniformly spread within the entire sample volume. This uniform distribution is an assumption that we intended to test using a volume sample. The results show that the actual distribution is not...

High-quality, long-term measurements of terrestrial trace gas emissions are important for investigations of atmospheric, geophysical and biological processes to help mitigate climate change, protect the environment, and the health of citizens. High-frequency terrestrial fluxes of the radioactive noble gas 222Rn, in particular, are useful for valida...

Phantoms can serve as a gold standard for the validation of MRI numerical methods. In some special cases, it is possible to compute analytically the Radon transform, or sinogram, of a phantom. In this work, we present analytical formulae to compute the exact sinograms of three classes of phantoms. We compare the use of the discrete Radon transform,...

This study assessed the impacts of the COVID-19 pandemic on tax revenues and small and medium enterprises (SMEs) revenues in Ghana using qualitative and quantitative analysis. These impacts were analyzed using autoregressive tax regressions, buoyancy, and tax elasticity formulas. A simple radon sampling was used to select 350 SMEs in five major cit...

Natural radioactive isotopes occur in various components of the natural environment, including groundwater. The general population, not always aware of possible threats, can use its resources. The activity concentration of some of the radioactive isotopes should be monitored, especially in those intakes from which it is possible to obtain water for...

This paper focuses on the range migration (RM) and Doppler frequency migration (DFM) problems, which are commonly faced in radar maneuvering target detection during the long-time integration. Considering the sparsity of target echo in the chirp rate (CR)-quadratic CR (QCR) domain, a novel coherent integration method is presented to realize the mane...

The rising demand on high frame rate ultrasound imaging applications necessitates the development of fast algorithms for plane wave image reconstruction. We introduce a new class of plane wave reconstructions that relies on a relation between receive data and image data in the Radon domain. This relation is derived for arbitrary dimensions and vali...

This article presents a new approach for image recognition that proposes to combine Conical Radon Transform (CRT) and Convolutional Neural Networks (CNN). In order to evaluate the performance of this approach for pattern recognition task, we have built a Radon descriptor enhancing features extracted by linear, circular and parabolic RT. The main id...

Compressed sensing allows for the recovery of sparse signals from few measurements, whose number is proportional to the sparsity of the unknown signal, up to logarithmic factors. The classical theory typically considers either random linear measurements or subsampled isometries and has found many applications, including accelerated magnetic resonan...