![]() Radioecological studies were carried out in 2014-2017 before the start of operation of the Rooppur Nuclear Power Plant. In order to control the radiation situation in the vicinity of the Rooppur Nuclear Power Plant (Bangladesh), a system of radioecological monitoring of terrestrial (mainly agricultural) ecosystems has been created. Terrestrial ecosystems (soil and plants) accumulate artificial radionuclides from emissions of nuclear power plants. The coefficients of accumulation of ⁹⁰Sr and ¹³⁷Cs in foodstuffs of animal and plant origin have been calculated. In drinking water, the specific activity of ¹³⁷Cs is at the level of 0.05, ⁹⁰Sr − 0.03, ³H − 1.3 Bq.L⁻¹. In livestock production, this difference is 1.2-6.8 times, fish 1.5 times, grain 1.2-4.2, vegetables 1.5-8.2, fruits 1.8-5.8 times. It was noted that ⁹⁰Sr accumulates in food products to a greater extent than ¹³⁷Cs. ![]() In cereals, the ¹³⁷Cs content varies in the range 0.2-0.6, vegetables 0.03-0.11, fruits 0.05-0.1 Bq.kg⁻¹ and is determined by the species characteristics of crops. Thus, the specific activity of the most radiologically significant ¹³⁷Cs in cow's milk averages 0.05 Bq.L⁻¹, beef − 0.14, poultry − 0.09, and fish − 0.15 Bq.kg⁻¹. An analysis of the results of a 4-year (2014-2017) cycle of studies on the assessment of the specific activity of natural (⁴⁰K, ²²⁶Ra, ²³²Th) and artificial (⁹⁰Sr, ¹³⁷Cs) radionuclides in the components of the diet of the population of the 30-km zone of influence of the nuclear power plant is presented. The system of radiation monitoring of local foodstuffs and drinking water in the settlements of the area of the Rooppur Nuclear Power Plant was developed. To assess radionuclide content in environmental objects, we used: low-background gamma spectrometer with a DKDK-100V detector spectrometric alpha-and beta-radiometer Quantulus 1220 alpha-and beta-liquid scintillation counter Tri-Carb 4810TR gamma-radiation energy spectrometer GAMMA-1P for two measuring paths with semiconductor detectors made of ultrapure germanium (EG&G ORTEC, USA) multichannel analyzer Desktop InSpector 1270 based on a semiconductor detector made of ultrapure germanium (Canberra Industries, Inc., USA) and gamma-radiation energy spectrometer Accuspec with a semiconductor detector made of ultrapure germanium based on an integral cryostat (Canberra Industries, Inc., USA). Sampling of components of freshwater ecosystems, their preparation for measurements, and measurements themselves were carried out following the developed regulations (Table 2) according to the certified methods in the accredited laboratories of Russian Institute of Radiology and Agroecology: for radionuclides -in the radiation control testing laboratory (accreditation certificate RA.RU.21AD81) for heavy metals and physical and chemical indicators -in the testing laboratory (accreditation certificate RA.RU.513078). samples were taken only in 2016-2017 due to the fact that in the early years of the development of radioecological monitoring network in Rooppur NPP area, the emphasis in research was placed on assessing population diets with food obtained from terrestrial (agricultural) ecosystems. The stoichiometry and the structure of the solid complex of Eu(III) with HP and S (1:3:1) were proposed based on elemental analysis, IR, ¹H NMR and ³¹P NMR data.Context 1. ![]() A very large synergistic enhancement (up to 10⁵) was established. ![]() It was found that in the presence of S the lanthanoid ions have been extracted as LnP3 The synergistic solvent extraction of selected lanthanoid ions (La, Nd, Eu, Ho, Lu) with 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (HP) and S in chloroform has been studied. The structure of this calixarene was identified and confirmed by elemental analysis, IR, ¹H and ³¹P NMR spectra indicate that at room temperature in DMSO-d6 and 1,1,2,2-tetrachloroethane-d2 solutions, S exists as a mixture of conformers. A new lower rim phosphorus-containing calixarene with six dimethyl-methylene phosphine oxide groups, namely 5,11,17,23,29,35-hexa(1,1,3,3-tetramethyl-butyl)-37,38,39,40,41,42-hexakis-(dimethylphosphinoylmethyleneoxy)-calixarene (S), has been synthesized and characterized. ![]()
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