background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...

Background: Knowledge of radioactivity levels in human diet is of particular concern for the estimation of possible radiological hazards to human health. However, very few surveys of radioactivity in food have been conducted in Iran therefore the baseline values of the natural radionuclides concentration (40K, 226Ra and 232Th), and man made radionuclide, 137Cs, were determined in twenty six...

On April 26, 1986, Unit 4 of the Chernobyl Nuclear Power Plant exploded, causing the most severe disaster ever to occur in the history of domestic nuclear-power production. That explosion spread both fission products of the normal operation of the reactor and unexpended uranium fuel across a large area. In total, ~14 EBq5 radioisotopes were released from the reactor, some of the most harmful be...

The article presents the results of a study on the bioaccumulation abilities of Polysiphonia fucoides, a red algae specific to the southern Baltic Sea, towards (of) gamma emitting isotopes. A laboratory experiment was carried out to determine changes in the activities of some isotopes-54Mn, 57Co, 65Zn, 110mAg,113Sn, 134Cs, 137Cs and 241Am-occurring in P. fucoides exposed to a seawater medium co...

The risk of internal exposure to 137Cs, 134Cs, and 131I is of great public concern after the accident at the Fukushima-Daiichi nuclear power plant. The relative biological effectiveness (RBE, defined herein as effectiveness of internal exposure relative to the external exposure to γ-rays) is occasionally believed to be much greater than unity due to insufficient discussions on the difference of...