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Fluorine Assessment of Igneous rocks by Neutron Activation Analysis

World Journal of Nuclear Science and Technology 2016年第3期6卷 140-146页

作者： Abdelrazig Mohmed Abdelbagi Physics Department Science College Shaqra University Da wadami Kingdom of Saudi Arabia Faculty of Science Omdurman Islamic University Omdurman Sudan

The main goal of the current study was to determine the fluorine in the rock samples coal (SARM-18, SARM-19, and SARM-20), opal glass NBS91 and phosphate rock NBS694 using neutron activation analysis. Neutrons energy of 14 MeV used for irradiation was produced by bombardment of a water-cooled titanium tri-tide target with a beam of deuterons accelerated to a potential of 350 KV to develop a neutron flux (108 n⋅cm-2⋅s-1) on the sample at the neutron generator in the ECN (Netherlands Energy Research Foundation) Petten. This new approach contributes to the existing knowledge of fluorine measurement by the coincidence channels investigation of the positron energy with respect to decay time for each radionuclide element. The present study was designed to determine the fluorine by fast neutron through the reaction of F19 (n, 2n) F18. Interference was treated by irradiating the standard of these elements and reasonable selection of the decay time between the end of irradiation and beginning of counting time. The results of this method indicate that the concentration of fluorine is agreed fairly with literatures.

关键词： Fluorine New Method rock samples Neutron Generator Activation Analysis Spectroscopy

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Damage Analysis of Circulating Soaked rock Sample Based on Sonic-test Trials

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International English Education Research 2014年第12期 67-69页

作者： HE Ye ZHAO Mingjie CAI Ying Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education Chongqing Jiaotong University Chongqing 400074 China School of Civil Engineering Hunan City University Yiyang 413000 Hunan China Yiyang Transportation Planning Survey and Design Institute Yiyang 413000 Hunan China

Circulating soaked sandstone and mudstone samples sonic parameters were tested and analyzed, using RSM-SY5 sonic instrument, the variation between soaked times and the velocity of longitudinal wave and shear wave was studied, calculation and analysis of the damage variable of circulating soaked rock samples were taken, with sonic measurement results and the empirical formula, the damage variable formulas associated with cycle times was established. The results showed that： the attenuation of sonic velocity basically in line with the exponential relationship, with cycle times increasing; The results of the critical calculation of damage variables and the strength test are well matched, which further confirms that the occurrence and expansion of new crack inside the rock mass resulted from circulating soaked lead to the decrease of the rock strength; The trend of sonic parameters attenuation and damage variable growth are good correspondence.

关键词： rock samples Circulating soaked Sonic-test trials Wave velocity Damage variable

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