نتایج جستجو برای: gamma dose
تعداد نتایج: 423486 فیلتر نتایج به سال:
Introduction: Radon-222 gas is a radioactive, colorless and odorless element that can cause lung cancer and stomach in humans with alpha-ray emissions. An important source of Radon-222 is the output water in springs, especially hot springs to emit ionision radiation. In this study, Rn-222 activity concentration and gamma dose rate levels in water sample of some selected hot spr...
Bipolar junction transistors (BJTs) are active semiconductor devices commonly used for amplification and switching applications. In this study, transistors have been biased to operate in active region and by measuring the electrical characteristics of BJTs, the effect of gamma irradiation on each of these characteristics was investigated before and after the gamma irradiation by 60Co source. In...
Background: The commissioning accuracy of Volumetric Modulated Arc Therapy (VMAT) need to be evaluated.Objective: To test and evaluate commissioning accuracy of VMAT based on the TG 119 protocols at local institution. Material and Methods: The phantom, structure sets, VMAT and IMRT beam parameter setup, dose prescriptions and planning objectives were following TG 119 guidelines to c...
Archeology dating of sample obtained from Vigoldistrict (center of Iran) was done using thermoluminecencse (TL) technique. The plateau region was determinedby comparing the TL glow curves of the samples received natural dose and those samples received natural dose plus gamma dosefrom the60Co source. The total equivalent dose of 10.17 Gy was obtained by the use of TL dose response of the samples...
In situ, high-resolution, gamma-ray spectrometry of a total number of 70 outdoor and 20 indoor representative measurements were performed in preselected, common locations of the main urban areas of Cyprus. Specific activities and gamma absorbed dose rates in air due to the naturally occurring radionuclides of (232)Th and (238)U series, and (40)K are determined and discussed. Effective dose rate...
Although portal dosimetry is used to provide quality assurance (QA) for intensity-modulated radiation therapy (IMRT) treatment plans, trends in agreement between the portal dose prediction (PDP) and the measured dose have not been clarified. In this work, we evaluated three scalar parameters of agreement for 152 treatment plans (1152 treatment fields): maximum gamma (gamma max), average gamma (...
Background: Human activities such as mining enhance the radioactivity levels above normal background which can lead to an incremental increase in the radiation risk to the population. Materials and Methods: 20 tailing enriched soil samples collected around Maiganga coal mine, Gombe, Northeast Nigeria were assessed for their 226Ra, 232Th and 40K contents using HPGe gamma-ray detector. Results: T...
Introduction: In nuclear medicine, the demand for a variety of radionuclides is rising every day. Radionuclides radiation doses to patients and staff are of high importance and it should be monitored and controlled in medical imaging centers. This study aimed to evaluate the safety principles in the Hegmataneh Gamma scan nuclear medicine center in Hamadan. Methods and Materials: Dose rate me...
Neutron beams for therapy always contain some gamma ray contamination that varies with depth and with distance from the beam axis. The problem therefore arises how the varying gamma ray contribution should be accounted for in dose specification. Not infrequently a "total effective dose" DE is quoted that is equal to the neutron dose plus the gamma ray dose divided by a constant weight factor ta...
Adverse effects of chronic low dose-rate gamma-ray exposure ameliorated by environmental enrichment in mice
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