نتایج جستجو برای: radon concentration
تعداد نتایج: 386938 فیلتر نتایج به سال:
The most stable isotope of radon, 222Rn, represents the major source of natural radioactivity in confined environments such as mines, caves and houses. In this study, we explored the possible radon-related effects on the genome of Dolichopoda cave crickets (Orthoptera, Rhaphidophoridae) sampled in caves with different concentrations of radon. We analyzed specimens from ten populations belonging...
The relationship between the standardised registration ratio (SRR) for monocytic leukaemia and the radon concentration by county in England was investigated. Leukaemia data were obtained from the OPCS and cover the age range 0-74 years and the period 1975-86. Radon concentrations were obtained from a recent National Radiological Protection Board report. A significant correlation was observed be...
Background: Radon is one of the most common radioactive substances in underground mines which can enter the lungs and cause diseases. The purpose of this research is to measure the concentration of radon and the annual dose absorbed by miners at Sabz, Moslem, and Kamari caves in Neyshabur turquoise mine. The results are compared with standard permissible limits and can play a significant role i...
Background: In this study, measurement of indoor radon and its progeny levels was carried out in Gas Turbine Power Station in Haryana ( India ), where natural gas is used as fuel. For comparison, the results of a study carried out in thermal power plant in Haryana are also presented. Radon being a ubiquitous air pollutant has global impact and its monitoring in the environment at work places is...
Radioactivity from radon is a major background for observing solar neutrinos at Super-Kamiokande. In this paper, we describe the measurement of radon concentrations at Super-Kamiokande, the method of radon reduction, and the radon monitoring system. The measurement shows that the current low-energy event rate between 5.0 MeV and 6.5 MeV implies a radon concentration in the Super-Kamiokande wate...
Radon concentrations and fluxes were measured for seasonal snowpack on Baldpate Mtn. in Newry, Maine during the winter of 2004. A solar radiation and temperature logging system was developed to monitor the snowpack during the radon measurements. Radon ground flux measurements were performed using a RAD-7 alpha spectrometer and ranged from 0.49 to 0.64 pCi m s for two different locations. Radon ...
Background: Decay products of radon and thoron present in indoor environment are the most important sources of radiation from natural sources which affect human beings, since general public spend at lest 80% of their time in indoor. Materials and Methods: Air samples were collected for measuring the concentration of radon and thoron daughter products from various indoor environments d...
Coal is an important non-renewable energy source of and can be associated with radioactive elements. In Figueira city, Paraná state, Brazil, it was recorded high uranium activity near the coal mine that supplies a local thermoelectric power plant. In this context, the radon activity (Rn-222, produced by the Ra-226 decay in the U-238 natural series) was evaluated in groundwater, river water and ...
Background and Objective: Radon is highly regarded because of its impacts on public health. Northern regions of Iran have a high potential for radon emissions. This research aimed to measure residential radon concentrations in Tarom country- Zanjan and to compare the results with international standards and acceptable values. Materials and Methods: Passive diffusive samplers, Solid State Nuc...
BACKGROUND Radon, a naturally occurring radioactive gas, is a carcinogen that causes a small proportion of lung cancers among exposed populations. Theoretical models suggest that radon may also be a risk factor for skin cancer, but epidemiologic evidence for this relationship is weak. In this study, we investigated ecologic associations between environmental radon concentration and the incidenc...
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