[en] Full text: In this paper we shall summarize our results obtained by radioisotope excited energy dispersive X ray fluorescence and instrumental neutron activation analysis techniques on the core and surficial sediment samples, collected from the Turkish coast of the Black Sea. Sediment samples, collected as gravity cores in depth from 70 cm to 150 cm, from the 20 sampling sites of the southern part of the Black Sea and surficial sediment samples, collected from 10 sampling sites of the Black Sea nearby Istanbul area in 1999 years were analysed by radioisotope excited EDXRF and INAA methods for Ca, Ti, V, Cr, Mn, Ni, Cu, Zn, Br, Rb, Sr, Y, Mo, Zr, Cd, Sb, I, Ba, La, Ce, Nd, U and Th elements. The investigated core sediment samples were the organic rich-mud components of the core samples, which were known as rich in metal concentrations. The C_org concentrations of the core samples were found from wet chemical analysis. In the case of EDXRF analysis, fundamental parameter technique was used and the palletised samples were excited using an ²⁴¹Am source (10 mCi) and a HPGe detector or a ¹⁰⁹Cd source (25 mCi) and a Si(Li) detector with resolutions of approximately 350 eV and 185 eV FWHM, respectively, at 5.89 keV. In the case of instrumental neutron activation analysis, the samples were irradiated simultaneously with international reference materials at a fission spectra neutron flux of the density of ∼5.10¹³ cm^-2.s^-1 (WWR-SM nuclear reactor of Institute of Nuclear Physics, Tashkent, Uzbekistan). The gamma-spectra were measured by using gamma-spectrometer with the 100 cm³ coaxial Ge (Li) detector (the resolution for 1332,5 keV line of ⁶⁰Co was ∼3 keV). Investigation of the core samples results indicated the presence of some correlations between U and Mo and U and C_org concentrations. U is known to associate mostly with dead organic matter through adsorption and fixation. On the other hand, Mo is known to accumulate in the sapropel section of the cores, which is rich of organic matters. Thus U, C_org and Mo dependencies may be explained by accumulation of these elements in organic rich components of the sediment cores. The results of the surface sediments were compared with those from the heavily and moderately contaminated parts of the sea sediments. It is found that some elemental concentrations of the Black Sea sediments are comparable with those in most other sea sediments in the vicinity of densely populated regions. (author)