Sunday, 14 December 2014

Radioactive contamination need proper environmental monitoring

USA NEWS CORP




Radioactive contamination need proper environmental monitoring

14 December, 2014, Japan, USA NEWS CORP


Radioactive contamination of the soil in the Fukushima area as a result of the Fukushima nuclear disaster is one of the most serious problems in Japan but it was still uncertain what kinds of materials actually bind the radioactive cesium nuclides which are responsible for the radiation. Due to such uncertainty, research and development of effective actions for decontamination have not progressed.
© 2014 Kogure Laboratory. Electron microscopic images of the typical radioactive particles (top) and X-ray spectra from the particles (bottom) indicating their chemical compositions. These particles have been identified as (left) weathered biotite, (center) a composite of organic matter and fine minerals and (right) an aggregate of fine minerals.
© 2014 Kogure Laboratory.
Electron microscopic images of the typical radioactive particles (top) and X-ray spectra from the particles (bottom) indicating their chemical compositions. These particles have been identified as (left) weathered biotite, (center) a composite of organic matter and fine minerals and (right) an aggregate of fine minerals.
Associate Professor Kogure’s laboratory in the Graduate School of Science, the University of Tokyo and researchers in Japan Atomic Energy Agency (JAEA), National Institute for Materials Science (NIMS), and the Japan International Research Center for Agricultural Sciences (JIRCAS) have successfully identified the cesium-fixing fine particles in soil samples from Iitate, Fukushima, and determined the distribution of the radiation in these particles, mainly using a variety of electron microscopic techniques. Alshamy A.A., Diab H.M., ElKameesy S.U., and Samy R.M., operated Elemental and Radiological safety Assessment in Al-Ramsy mining and milling facility Southwestern Sinai, Egypt. The research was carried by  Radiation Protection Department, Nuclear and Radiological Regulatory Authoriy, Egypt, Nuclear Material Authoriy, Egypt and Faculty of Science- Ain Shams University, Egypt. The obtained results showed that all locations at distances > 200 m inside the mine are expected to be hazardous. The results were published on The Journal of Energy and Environmental Science. Dose assessment and hazard indices criteria were calculated and discussed. It was found that the absorbed dose rate, annual effective dose, internal annual effective dose due to radon progeny and the representative level index Iγr  exceed the regular limits in particular at sampling locations 10, 11, 12 and/or at distances (x >200m) inside the mine. Accordingly, results may be used to collaborate in the development of the mine by taking into consideration all the possible solutions such as ventilation constructing several opening in the wall of the mine and using suitable machinery systems inside the mine to explore the fore mentioned strategic elements inside the mine. Um Bogma formation in southwestern Sinai is the site of important elements exploration since more than four decades. The main strategic elements considered in this place are U, Mn, Fe and Cu. The beneficial uses of these elements are very well known in different industrial domains. As a matter of fact majority of different ores in mines contain considerable amount of natural radioactivity. The major sources responsible for that are the naturally occurring radionuclides in the earth’s crust such as 238U, 232Th and 40K. Investigations on terrestrial natural radioactivity in soil, host rocks and mines have received considerable importance worldwide and led to extensive work in many countries. 

USA NEWS CORP



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