natural radiation Articles

  • Natural radiation level in the environment of Tehri Garhwal, Uttaranchal

    The natural radiation levels were measured in about 50 residential houses of Tehri Garhwal, Uttaranchal, using an environmental radiation dosimeter in both the indoor and the outdoor atmosphere. The total gamma ray activity was found to vary from 29.74 µR/h to 41.19 µR/h with a mean of 36.5 µR/h for the indoor environment, whereas for outdoors it varied from 28.76 µR/h to 43.46 µR/h with a mean ...


    By Inderscience Publishers

  • Cancer incidence in areas with elevated levels of natural radiation

    It has been reported that on reaching a certain level of cell damage the production of repair enzymes is triggered which decreases the chromosome aberrations. If this happens, prolonged exposure to high levels of natural radiation in areas with elevated levels of background radiation could decrease the frequency of chromosome aberrations. Recent epidemiological studies indicated that there is an ...


    By Inderscience Publishers

  • A review on comparison of natural radiation in Iran with other countries

    The environment around people is radioactive due to receiving ionisation radiation from the sky, the Earth's crust, and atoms in water, food, building materials and metals. Around 82% of human absorbed radiation doses, which are out of control, are from natural radiations. It is considerable that the background dose rates from cosmic rays depend on the altitude and regions with high altitude have ...


    By Inderscience Publishers

  • Ionising Radiation

    Introduction The energy level of some types of radiation is high enough so that when they interact with matter they cause the formation of electrically charged particles or ion-pairs and break molecular bonds. These so-called ionising radiations are by their nature potentially harmful to life; at high doses they can be lethal and at lower doses can cause genetic damage. Ionising radiation occurs ...

  • Evaluation of natural radioactivity in rocks of Nilgiri hills and their radiation hazard to mankind

    Twenty three rock samples were collected from various altitudes of Nilgiri hills, Tamil Nadu, India. A survey was carried out to determine the activity concentration of selected radionuclides (238U, 232Th, 40K) by means of gamma–ray spectroscopy using NaI (Tl) detector. From the measured spectra, ...


    By Inderscience Publishers

  • Entropy generation for unsteady natural convection and thermal radiation inside a porous enclosure

    Entropy generation problem for unsteady natural convection and thermal radiation in a vertical porous enclosure, submitted to a uniform hot walls temperature and filled with a fluid saturated porous medium, has been performed. A time–space variations study is presented for fluid flow, heat transfer and radiative transfer irreversibilities, local entropy generation Sgen and ...


    By Inderscience Publishers

  • Radiation doses due to natural radioactivity in the Afra hot springs, Jordan

    This paper briefly reports some data from investigations carried out in the Afra hot springs, 160 km south of Amman, Jordan. These data emphasise the new findings of high-radiation dose equivalents, mainly to identify the potential and known impacts of exposure on public health in High Levels of Natural Radiation Areas (HLNRAs) of this region, and also to make recommendations for further studies. ...


    By Inderscience Publishers

  • Assessment of radiation dose due to natural radionuclides in various cement samples

    Samples of Ordinary Portland Cement (OPC) and Portland Pozzolana Cement (PPC) from five companies were analysed for the measurement of 226Ra, 232Th and 40K using a HPGe detector based on high–resolution gamma spectrometry system. The measured ...


    By Inderscience Publishers

  • Recommendations on radiation protection

    The health effects of acute and chronic exposure to radiation are discussed, with reference to the incidents in Chernobyl, Ukraine and in Taiwan. Conclusions are drawn related to the overall comprehension of these health effects and the basis for radiation protection.Keywords: International Radiation Protection Committee, IRPC, radioprotection regulations, beneficial effects, hormesis, cobalt, ...


    By Inderscience Publishers

  • Radiation spectra of surface

    The paper contributes to the theory of thermal radiation. In addition to the common energy spectrum of radiating surfaces, the entropic and exergetic spectrum of the perfectly black or perfectly grey surfaces is proposed. Also, besides the traditional surface emissivity, called in the considerations the energetic emissivity, the entropic and exergetic emissivities are introduced. The theoretical ...


    By Inderscience Publishers

  • Non-Ionising Radiation

    Pressures on the environment may occur through chemical, physical and biological agents. The subject of this study is physical agents, where physical fields are examined. Physical fields are part of the natural environment. Depending upon their properties and the surrounding conditions, physical fields are transmitted through the spaces in which we live, potentially affecting human health and ...

  • Radiation risk in the structure of overall risk

    Theoretical, methodological, and methodic aspects of the problem of radiation risk analysis are considered. It was shown that the potential risk caused by technogenic exposure cannot be selected practically for certain on the overall risk background relative to exposure of factors of non-radiation nature. The structure of the overall risk, both assessment and of its radiation component is given. ...


    By Inderscience Publishers

  • Documented optimum and threshold for ionising radiation

    A concept of the complete dose-response curve of ionising radiation will allow us to live in harmony with this ubiquitous agent. Convincing data show ionising radiation is essential for life. Ambient levels of ionising radiation (about 2 mSv/y without medical and cosmic radiation) are adequate for life but insufficient for abundant health. We live with a partial deficiency of ionising radiation. ...


    By Inderscience Publishers

  • High natural background radiation areas in Ramsar, Iran: can inhabitants feel safe?

    Ramsar, a coastal city in the northern part of Iran, has one of the highest levels of natural radiation known to exist in an inhabited area. The study of the effects of high natural background radiation on human health was the main goal of this investigation. We also compared some features in relation with the health between residents of high and normal natural background radiation areas in ...


    By Inderscience Publishers

  • Entropy generation for unsteady natural convection and radiation within a tilted saturated porous channel

    The problem of entropy generation for unsteady natural convection and radiation in a tilted open-ended channel, submitted to uniform hot walls temperature and filled with an isotropic fluid saturated porous medium is outlined. The present study is carried out using the Darcy flow model. The local thermal equilibrium assumption is assumed. Viscous dissipation effects are taken into account. The ...


    By Inderscience Publishers

  • The estimation of radiation doses in human organs due to natural and artificial radioactivity in surface waters of the Ebro river basin (Northeast Spain)

    This paper reports the estimation of the radiation doses in the human body in the Ebro river basin (Northeast Spain), following drinking water ingestion by measuring 40K, 226Ra, 90Sr and 3H. The equivalent dose in ten different organs was estimated. Dose calculations were performed by means of the GENII computer ...


    By Inderscience Publishers

  • Induction of thymine dimers by solar radiation in natural freshwater phytoplankton assemblages in Patagonia, Argentina

    Natural phytoplankton assemblages from a freshwater lake in Trelew (Province of Chubut, Patagonia, Argentina) were exposed to natural solar radiation at different depths in a water basin filled with fresh water rich in humic substances. Samples were taken at regular intervals for DNA extraction and subsequent analysis of DNA damage by determining the formation of thymine dimers using an ...


    By Springer

  • Why are we so afraid of nuclear radiation?

    The origin of the LNT model of radiation carcinogenesis is outlined. The A-bomb survivor cancer mortality data are shown to not support this model at all. The nature of cancer and the role of the body's natural defence mechanisms are discussed. A simple biological model of the effect of radiation is shown to be more credible and consistent with the observed beneficial health effects at low doses ...


    By Inderscience Publishers

  • Is Radon & Radiation from Granite Countertops a Concern?

    Over the past several years there have been numerous media reports about possible health concerns regarding granite countertops emitting radiation and radon gas into people’s homes and businesses.  Granite’s durability and decorative appearance have made it a popular building material in many homes and buildings. Almost any type of rock could contain naturally occurring ...


    By EMSL Analytical, Inc.

  • Molecular evidence of radiation hormesis at occupational exposure

    The idea of favourable effects of low dose ionising radiation in biological systems has existed for many years and is the basis of radiation hormesis hypothesis. New evidence at subcellular levels might contribute to further clarify this problem. We used molecular epidemiological biomarkers (DNA/protein changes in peripheral blood; immunological changes in lymphocytes) in occupationally-exposed ...


    By Inderscience Publishers

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