background: the concentrations of radionuclides like 226ra, 232th and 40k and the dose rate are measured in igneous and metamorphic rock formations in and around chickmagalur. a total of 236 samples from 13 different locations around study area were analyzed. materials and methods: the activity concentrations of the three radioactive elements were determined for mean period of 25000 s using hpg...

background: many radioactive compounds may be released into the environment and hence into the drinking water supplies due to the human activities. radionuclides can also enter the food chain if the contaminated water is used for drinking or irrigation purposes. objective: to estimate the annual effective dose of natural radioactive materials like 226ra and 40k in drinking water of wells in zan...

Introduction Natural and man made radioactive sources exist in our environment they can enter into our food chains. One of these is the soil-mushroom-human chain. High level doses of natural radiation can cause hazards to humans. Materials and Methods Samples of Agaricus bisporus cultivated edible mushroom in Tehran province- Iran were collected from 7 farms. Specific activity of 226Ra, 228Ra, ...

There is concern that work scenarios on the tantalite mining sites in Oke-Ogun, Oyo State, Nigeria may cause occupational radiation exposure of workers due to enhanced concentrations naturally occurring radionuclides some process materials. A prior radiological assessment activities was carried out determine if and which require protection measures. Samples materials involved, comprising (tanta...

The change of natural ionizing radiation and the radon exhalation rates from typical building materials in underground parking lots are presented article. activity concentration radionuclides 232Th, 226Ra, 40K six important types construction materials, which mostly used Lithuania, were analyzed using high-resolution gamma spectroscopy. highest values found concrete ferroconcrete samples: 226Ra...

natural background radiation is the main source of human exposure to radioactive material. soils naturally have radioactive mineral contents. the aim of this study is to determine natural ((238) u, (232) th, (40) k) and artificial ((137) cs) radioactivity levels in wheat and corn fields of eilam province.hpge detector was used to measure the concentration activity of (238) u and (232) th series...

Background (Ba,Sr)SO4 solid-solutions range among the most important scaling minerals, not only in geothermal energy production, but generally in applications involving hydrothermal brines, e.g. including petroleum production [e.g. (Todd and Yuan 1990, 1992; Kühn et al. 1997)]. Besides the general difficulties related to scale formation, like blockage of pipes, related decrease of well producti...