Radio nuclide diagnostics with neyrotropny pharmaceuticals

Abstract Surface deposits and sediment cores were collected from the Upper Bonny Estuary, located in Southwest Nigeria, and analyzed to determine spatio-temporal and vertical distributions of radio-nuclide activities expressed in Bq·kg−1 dry weight. The results of activities of naturally occurring radionuclides of 226Ra (15 ± 2–34 ± 3 Bq·kg−1), 228Ra (32 ± 5–48 ± 6 Bq·kg−1), 40K (264 ± 29–462 ± 36 Bq·kg−1) were found to be all within the range of typical values reported for coastal regions. Ratios of 226Ra to 228Ra suggested accretion for all samples with low sediment accumulation registered during rainy months. In addition, vertical distributions at the three sampling sites were also studied with the initial aim of establishing chronologies from the decay of excess 210Pb. In two cores, excess 210Pb, estimated by subtracting 226Ra from total 210Pb on a layer-by-layer basis, exhibit relatively constant activity with discrete minima and maxima. Therefore, these cores were excluded from radiometric dating. Only the third core could be dated by the constant rate of supply model, and 137Cs was utilized to validate the 210Pb chronology.

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Evaluation of ossification in jaw defects by radio-nuclide imaging

European Journal of Nuclear Medicine ◽

10.1007/bf00443922 ◽

1982 ◽

Vol 7 (4) ◽

pp. 155-157

Author(s):

R. Senekowitsch ◽

H. Kriegel ◽

M. Siegle ◽

F. Brachmann

Keyword(s):

Radio Nuclide ◽

Jaw Defects

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Natural and anthropogenic radioactivity of feedstuffs, mosses and soil in the Belgrade environment, Serbia

Archives of Biological Sciences ◽

10.2298/abs1002301g ◽

2010 ◽

Vol 62 (2) ◽

pp. 301-307 ◽

Cited By ~ 7

Author(s):

Svetlana Grdovic ◽

Gordana Vitorovic ◽

Branislava Mitrovic ◽

V. Andric ◽

B. Petrujkic ◽

...

Keyword(s):

Natural Radionuclides ◽

Living Environment ◽

Spectroscopic Measurement ◽

Activity Level ◽

Level Of Activity ◽

Radio Nuclide ◽

Nuclide Activity ◽

High Level ◽

Range Of Values ◽

137Cs Contamination

By gamma spectroscopic measurement a content of natural radio-nuclides (40K, 238U, 226Ra, 232Th) and 137Cs was determined in samples of soil, alfalfa, maize and moss on six sites in the surroundings of Belgrade. Natural radionuclides in the soil were at the level characteristic for Serbia, whereas a relatively high level of activity of 137Cs (around 30 Bq kg-1) was determined. On the other hand, in plant samples mostly used as feed (such as alfalfa and maize) the concentration of natural radio-nuclide activity and 137Cs was relatively low, i.e. below the range of detection. The content of natural radio-nuclides in moss was within the standard range of values specific for Serbia. However, the activity level of 137Cs in moss gathered from the wider area around Belgrade, was high, the highest measured level being in the Avala-Zuce area (158-221 Bq kg-1). Our results show that this radio-nuclide is still present in the living environment of Belgrade even 20 years after the Chernobyl disaster, and that moss is a good indicator of living environment 137Cs contamination.

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Application of Granulated Glauconite and a Sorbent Modified on its Basis in the Processes of Water Systems Purification from Cesium Radio Nuclides

Water sector of Russia: problems, technologies, management - Методы оценки и механизмы регулирования водопользования в современных условиях ◽

10.35567/1999-4508-2017-4-7 ◽

2017 ◽

Author(s):

Keyword(s):

Water Solution ◽

Kinetic Curve ◽

Water System ◽

Distribution Coefficients ◽

Exchange Capacity ◽

Static Exchange Capacity ◽

Dynamic Conditions ◽

Cesium Sorption ◽

Radio Nuclide ◽

Filter Bed

High effectiveness of the granulated glauconite and nickel-cadmium sorbent modified with mixed ferrocyanide on its basis application as a filter bed for water solution purification from cesium radio nuclides has been demonstrated. Meeting of the developed sorbents mechanical strength of the GOST requirements to filtering grained materials has been stated. Results of the investigation of the sorption concentration of 137Cs radio nuclide from water solutions with experimental samples in static and dynamic conditions have been presented. The modified sorbent has shown an increased specificity in respect of 137Cs. The developed sorbents’obtained static exchange capacity in terms of 137Cs is estimated by the value >30 mg/g. Cesium sorption with the sorbents under study time dependencies have been obtained. It has been stated that the sorbent modification causes the process speed constant increase at the starting section of the kinetic curve. Output curves of the cesium sorption with the developed sorbents in dynamic regime are presented. Distribution coefficients for 137Cs obtained in dynamic conditions for the modified sorbent are one order of magnitude higher than that for granulated glauconite. During filtration of 34500 ml of water solution (≈ 8600 unit’s volumes) the fault did not exceeded 6 %. The obtained experimental data enable to recommend both granulated glauconite and its modified analog as a filter bed. For the first time it has been shown that the use of the modified sorbent allows to increase the treatment facilities filtering cycle. The sorbents developed on the basis of local natural materials can be applied in the water system treatment techniques for purification from cesium radio nuclide.

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Design and Operation of the Combined Technology Automated Waste Characterization System

ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B ◽

10.1115/icem2011-59308 ◽

2011 ◽

Author(s):

J. A. Mason ◽

M. R. Looman ◽

R. A. Price

Keyword(s):

Gamma Ray ◽

Fission Products ◽

Monte Carlo Analysis ◽

Research Centre ◽

Joint Research ◽

Neutron Measurement ◽

Bar Code ◽

Counting Data ◽

Radio Nuclide ◽

Reading Technology

This paper describes the design and operation of the Combined Technology Automated Waste Characterisation System (CTA-WCS) at JRC Ispra. The WCS was designed for the measurement of fission products and uranium and plutonium containing waste arising from nuclear fuel and nuclear materials processing and reactor operations. The WCS covers a range of activity including Low and Intermediate Level Waste (LLW and ILW). The system is designed to measure the waste in 200 and 400 (440) litre drums with a maximum drum weight of 1500 kg. Gamma-ray measurements of radio-nuclide content are performed by a gamma ray measurement station which functions as either a Segmented Gamma Scanner (SGS) or Tomographic Segmented Gamma-ray Scanner (TSGS). Either of these two techniques may be employed to perform the functions of drum screening, non-destructive examination (NDE) and, where appropriate, final drum assay. Coupled to the gamma ray station is a surface dose-rate measurement station, which employs 6-shielded Geiger-Muller detectors. Active and passive neutron measurements are performed by an advanced, graphite lined Differential Die-away (DDA) system, which comprises the neutron measurement station. The DDA performs conventional passive neutron totals, coincidence, and multiplicity counting and active DDA total neutron counting. Data analysis is based on the use of a range of matrix calibrations, some determined by Monte Carlo analysis. Linking the gamma ray and neutron measurement stations is an automated roller conveyor with a 20 drum buffer capability and a weight measurement station. Drums are identified by bar code reading technology. Once loaded, the system performs automatic assay of up to 20 drums and then returns the drums to the buffer position on the conveyor. The first WCS of this type was supplied to the European Commission at the Joint Research Centre (JRC) Ispra in northern Italy and it was commissioned at the end of 2007. It is now in a phase of pilot operation. Results will be presented from the first drum measurement campaign.

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