To properly interpret the quality of a gamma-spectroscopy measurement, an uncertainty estimate must be made. The uncertainty in the efficiency calibration is the dominant component to the total propagated measurement uncertainty for many types of measurements. Any deviations between the as-calibrated geometry and the as-measured geometry contribute to the total uncertainty. A mathematical techn...

Introduction: The functionalized Multi-Walled Carbon Nanotube with hydroxyl group (MWCNT-OH) due to high aspect ratios (length to diameter), and also excellent mechanical, electrical and thermal characteristics, has great potential applications in flexible electronics, solar cells, antistatic devices, electromagnetic interference shielding, radiation shielding, electrode materi...

to the best of our knowledge, imaging of accidental exposure to radioactive fluorine-18 (f-18) due to liquid spill has not been described earlier in the scientific literature. the short half-life of f-18 (t½=110 min), current radiation safety requirements, and good manufacturing practice (gmp) regulations on radiopharmaceuticals have restrained the occurrence of these incidents. the possibility...

Methylammonium is a substrate for the ammonium transport system of Azotobacter vinelandii. During cellular uptake methylammonium is rapidly converted to a less polar metabolite (E. M. Barnes, Jr., and P. Zimniak, J. Bacteriol. 146:512-516, 1981). This metabolite has been isolated from A. vinelandii and identified as gamma-glutamylmethylamide by mass spectroscopy, 1H nuclear magnetic resonance s...

Introduction: This Study has was  carried out to measure and detect the natural occurred radionuclide content including 226Ra, 232Th and 40K in the  Nile River sediments at various locations in Upper Egypt, from Aswan to El-Minya. Additionally, we determine the absorbed dose rate, the annual effective dose equivalent, and excess lifetime cancer risk also has been calculated. Material and Metho...

Abstract The traditional gamma energy spectrum measurement system performs filtering, shaping, amplification, baseline recovery, stacking discrimination, peak hold, and low-speed ADC sampling on the pulse signal output by gamma-ray detector. It generates curves. There are problems such as large dead time accumulation. A high-speed digital processing chip (FPGA) a used to perform full amplified ...

background: a few elements of soil are radioactive. soil can transfer radionuclide into plants feeding human. sometimes their   levels are as high as to be concern of human healthy. rice has an important share for iranian foods especially in north of iran. therefore we decided to obtain radionuclides concentration emitting g rays in lahijan city (northern iran) rice fields using g spectroscopy....