نتایج جستجو برای: high natural radiation areas
تعداد نتایج: 2925709 فیلتر نتایج به سال:
background: ramsar (mazandran province) is known for its extremely high levels of natural background radiation. although no excess cancer rate is reported in these areas by epidemiological studies, the study of tumor markers in the inhabitants of these areas may shed some light on the impact of high levels of background radiation on cancer induction. materials and methods: the level of backgrou...
Some areas in Ramsar, a northern city of IRAN, have the most natural radiation level in the world which is due to high concentration of 226Ra and its daughter products specially 222Rn and therefore these regions have been interested for radiation related investigations. The aim of this study also has been to evaluate public exposure in such areas in Ramsar, in order to obtain up to date informa...
Background and Objective : Natural radioactivity has been the subject of studies for many years. The mean of radiation doses of human from natural sources is about 2.5 mSv/year, but in some regions in the world this value is many times greater than the world mean. Ramsar, a city in Iran, is one of the most important high natural background areas of the world. According to UNSCEAR 2000 report,...
introduction the exposure of human beings to ionizing radiation from natural sources is a continuing and inescapable feature of life on earth. for most individuals, this exposure exceeds that from all man-made sources combined. materials and methods in this study, the annual effective dose in high level environmental background radiation areas (hlebras) of northern city of ramsar in iran was de...
The cancer mortality ratios (CMRs) in Poland in high and low level radiation areas were analyzed based on information from national cancer registry. Presented ecological study concerned six regions, extending from the largest administration areas (a group of voivodeships), to the smallest regions (single counties). The data show that the relative risk of cancer deaths is lower in the higher rad...
today, nuclear medicine has rapidly been developed so that in some cases, plays a unique role in diagnosis but unfortunalty in spite of diagnostic and therapeutic advantages, the term “nuclear” can induce worries in patients and society. in this article, base on new documents, we intend to show that this worries has no scientific basis. to produce a realistic view, regarding to radiation protec...
according to the report published by the united nations scientific committee on the effects of atomic radiation (unscear) in 2000, ramsar city in northern iran, has some inhabited areas with the highest known natural background radiation levels in the world (1). the annual radiation absorbed dose in high background radiation areas (hbras) of ramsar is extraordinary high, reaching 260 msv that i...
background: the effect of natural background radiation on health is still controversial. however, it is clear that it depends on the dose received by the population. the estimation of external natural background gamma rays received by the population of caspian coastal provinces in the northern part of iran was the main goal of this study. materials and methods: gamma rays was measured using cal...
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