three nearly simultaneous events around the end of the 19th century, i.e., the discovery of x‐rays by roentgen in 1895, natural radioactivity by antoine‐henri becquerel in 1896 and isolation of radium by the curies' in 1898 opened the nuclear era which has changed broadly the worlds of physics, biology and medicine. at the close of the 20th century, fundamental discoveries in biology at mo...

the aim of this study was to investigate the radioprotective effect of thymol as a natural product against salivary glands dysfunction induced by ionizing radiation in rats. the rats were treated with thymol at dose of 50 mg/kg before exposure to radiation at dose 15gy. salivary gland function was evaluated with radioisotope scintigraphy and then salivary gland to background counts ratio was ca...

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Introduction In this study, effective dose equivalent for the public due to internal exposure to 222 radon ( 222 Rn) was evaluated in three regions of Ramsar, a northern coastal city in Iran. Materials and Methods Measurements were carried out using a radon monitoring device. Outdoor and indoor radon concentrations were measured within 24 hours with an integration interval of 3 hours. Regions w...

INTRODUCTION There are several high-background radiation areas (HBRAs) in Yangjiang of Guangdong Province, China, and Karunagappally of Kerala State, India. In order to evaluate the health effects of high natural radiation, epidemiological studies have been conducted by local scientists. Currently, these studies are continued with the help of Japanese researchers. In this paper, their results w...

When an organism is exposed to radiation, various effects occur, though there may be differences in quality or degree. These are the cleavage of nucleic acids and the denaturalization of biological substances by active oxygen and free radicals that are produced by the excitation of water caused by the energy absorbed by the body, depending on the types of radiation such as alpha ray, beta ray, ...

background: light is an important and adjustable physical factor in the job environment.this study aimed to determine the intensity of natural and mixed light and also the level of ultraviolet radiation in libraries and computer sites of ilam universities in spring 2011.   methods: in this cross-sectional study, 10 libraries, 16 study saloons, and 7 computer sites were selected. luminosity asse...