نتایج جستجو برای: gamma radiation dosimetry
تعداد نتایج: 353726 فیلتر نتایج به سال:
The dosimetric characteristics of γ-radiation induced defects in strontium sulfate rod dosimeter were investigated using electron paramagnetic resonance (EPR) technique focusing on the dose range of 10–15000 Gy. The most significant EPR signals of spectroscopic splitting factor (g-value) g=2.0036 ، g=2.0090 and g=2.0160 were observed and attributed respectively to the SO4¯, SO3&...
There is a need for accurate dosimetry for studies of health effects in the Japanese atomic bomb survivors because of the important role that these studies play in worldwide radiation protection standards. International experts have developed dosimetry systems, such as the Dosimetry System 2002 (DS02), which assess the initial radiation exposure to gamma rays and neutrons but only briefly consi...
This work presents different techniques to increase the sensitivity of commercial MOSFET (no RADFET) to demonstrate their potential as dosimetry sensors with electrons beams (for IORT) and gamma radiation. Different models of commercial MOSFET were irradiated in unbiased and biased mode, to select the best candidate and configuration for each type of radiotherapy.
Onyx samples were studied in this work to verify their dosimetric properties. The Onyx stone is considered nobler than marble. At IPEN, the radiation metrology group has studied new materials for application in highdose dosimetry. The Onyx samples were exposed using a Gamma-Cell 220 system ( 60 Co), for doses of 50 Gy up to 300 kGy. The lower detection doses, the reproducibility of the OSL resp...
Cases involving high-doses of ionizing radiation are becoming increasingly common.The objective of this work was to characterize thermoluminescent materials for the dosimetry of workers exposed to high doses. Samples of TLD-200, TLD-400 and TLD-800 pellets from Thermo Electron Corporation were studied in gamma high-doses. Dose-response curves were obtained for doses between 100 mGy and 100 Gy. ...
Rapid development in nuclear industry and medical applications involving radiation sources would increase the potential of exposure to the ionizing radiation. Due to the harmful effects of radiation exposure on the health of radiation workers, rapid dose estimation of the overexposed victims with high accuracy is quite important in taking appropriate medical treatment plan. Biological dosimetry...
gamma rays pose enough energy to remove electrons from atoms of absorbing material including human body and adversely affect human health. the external exposure of human beings to natural environmental gamma radiation normally exceeds that from all man-made sources combined. therefore, we monitored gamma dose rate in indoor environments and estimated corresponding annual effective dose in selec...
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...
*長友恒 人 ,市 川米太:奈 良教育大学物理教室,奈 良 市高畑町 〒630 **星 正治:広 島大学原爆放射能医学研究所,広 島市 南区霞1-2-3 〒734 Thermoluminescence dosimetry/Gamma rays/Hiroshima and Nagasaki/Atomic bomb This study reports gamma-ray doses measured using thermoluminescence (TL)dosimetry of atomic-bomb exposed ceramic samples from Hiroshima and Nagasaki. Advances in the dosimetry of TL-sensitive minerals in the field of TL dating of archaeolo...
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