Zobrazeno 1 - 10
of 12
pro vyhledávání: '"B. A. Chapyzhnikov"'
Autor:
V. P. Kolotov, N. N. Dogadkin, Yu. M. Tsipenyuk, A. Yu. Andriyanov, S. N. Shilobreeva, B. A. Chapyzhnikov, V. I. Korobkov
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 271:671-678
It has been shown that gamma-activation significantly extends possibilities of activation autoradiography with respect to determination of platinum group elements (PGE) in silicate samples. All PGE may be activated by bremsstrahlung with forming radi
Publikováno v:
Journal of Analytical Chemistry. 60:45-48
The volume concentration of carbon and nitrogen in different meteorites was determined by gamma-ray activation analysis on a microtron. The 11C and 13N radionuclides forming in photoneutron reactions were isolated by high-temperature extraction; thei
Autor:
Yu. M. Tsipenyuk, V. I. Korobkov, V. P. Kolotov, B. A. Chapyzhnikov, A. Yu. Andriyanov, N. N. Dogadkin, S. N. Shilobreeva
Publikováno v:
Journal of Analytical Chemistry. 58:882-886
The potential of the gamma activation determination of platinum-group elements and gold both by instrumental gamma activation analysis (bulk analysis) and by monitoring their distribution using autoradiography (local analysis) is studied. It is shown
Autor:
V. P. Kolotov, M.V. Alenina, N. N. Dogadkin, S. N. Shilobreeva, B. A. Chapyzhnikov, A. Yu. Andriyanov
Publikováno v:
Radiochimica Acta. 89:765-772
Application of digital document scanners as a tool for 2D-densitometry of autoradiograph images is discussed. Comparison with conventional densitometry is presented. The requirements for scanners and software for digital autoradiography of geological
Autor:
B. A. Chapyzhnikov, Yu. M. Tsipenyuk
Publikováno v:
Czechoslovak Journal of Physics. 49:479-482
Special fast procedure for radiochemical extraction of carbon impurities from boron samples was developed. The procedure consists of alloying the sample in a mixture of KNO3+KOH at 600°C, dissolving of the cooled melt in water, and subsequent distil
Publikováno v:
Journal of Experimental and Theoretical Physics Letters. 68:112-116
A search for anomalous carbon atoms \({}^{12}\tilde C\) — atoms with three K-shell electrons — is made by γ-activation analysis of boron with the impurity carbon removed radiochemically. A limit on the existence of such atoms was determined: \({
Publikováno v:
Radiation Physics and Chemistry. 51:507-511
Experiments which search for chemically boron-like carbon nuclei in samples of pure boron were carried out by a photo-activation technique. Use was made of the 12 C( γ ,n) 11 C reaction with irradiation by bremsstrahlung photons of below 30 MeV. The
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 217:261-265
A solubility of nitrogen in natural basalts and synthesized albite at 1250 °C and 3 kbar was studied by γ-activation method based on the reaction14N(γ,n)13N with radiochemical separation of nitrogen by high-temperature extraction at 1800 °C. Dete
Autor:
B. A. Chapyzhnikov, V. I. Rodionov, T. T. Kiseleva, V. I. Firsov, M. N. Shtchulepnikov, V. N. Samosyuk
Publikováno v:
Journal of Radioanalytical Chemistry. 37:203-212
Oxygen and carbon concentrations up to 0.06 ppm and 0.03 ppm respectively were determined in high purity metals such as Fe, Cu, Nb, Mo, In and some others. Analytical procedures and results of the determination of alloying additives in a number of ra
Publikováno v:
Soviet Atomic Energy. 62:43-48
The authors present a technique for optimizing the gamma activation analysis of trap rock using the OPTIMUM program. Comparative results are presented for the calculated and measured radioactivity, in optimal regimes of the gamma spectra, induced by