نتایج جستجو برای: رادیوسزیوم 137cs
تعداد نتایج: 1267 فیلتر نتایج به سال:
A simple analytical method was developed to estimate external doses from exposure to contaminated riverine shorelines. The method consists of deriving an adjustment factor that accounts for the geometry of the riverine shoreline; the adjustment factor is applied to the dose-rate coefficients already available for infinite contaminated surfaces. Such a geometry factor circumvents very complex ra...
background: the sources of radioactivity in the environment have natural, terrestrial and extraterrestrial, and anthropogenic origins. plants may get radioactive nuclides in two ways: (i) by the deposition of radioactive fallout, (ii) by absorption from the soil. materials and methods: the concentrations of the natural radionuclides (226ra, 228ra, 40k) and the artificial radionuclide (137cs) in...
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...
زمینه و هدف: عناصر پرتوزا با گسیل تابش های هسته ای باعث بروز بیماری هایی نظیر سرطان یا ناهنجاری های ژنتیکی می گردند. بنابراین مطالعه پرتوزایی خاک و مواد غذایی و هم چنین محاسبه ریسک بروز سرطان برای مواد غذایی ضروری به نظر می رسد. مواد و روش ها: در این پژوهش، 9 رقم مختلف لوبیا شامل دانه های لوبیا، قسمت های هوایی آن و خاک زراعی آن ها جمع آوری شدند. با استفاده از روش طیف سنجی گاما و آشکارساز فوق خا...
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, ...
Reassessment of the radiocesium resuspension flux from contaminated ground surfaces in eastern Japan
Abstract. Resuspension of 137Cs from the contaminated ground surface to atmosphere is essential for understanding environmental behaviors and estimating external inhalation exposure residents. Kajino et al. (2016) assessed resuspension flux bare soil forest ecosystems in eastern Japan 2013 using a numerical simulation constrained by air concentration measurements. However, was found underestima...
Cesium-137 (137Cs) is the most important indicator of radioactive pollution in marine environment due to its half-life (Tph: 30.2 years), high fission yield, solubility (70% ionic form) and bioavailability (similar potassium). Soluble radionuclides, like 137Cs, seawater are associated with physicogeochemical biological parameters (e.g. temperature, water density, biota exchange processes, mass ...
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