3rd-INCC

Session

Session 5

5

20 Sept 2011, 08:30

Città del Mare, Terrasini - Palermo - Sicily - Italy

197. Half-lives of Pu isotopes

Prof. Suresh Aggarwal (Homi Bhabha National Institute (HBNI))

20/09/2011, 08:30

Radioecology and Geochemistry

oral presentation

199. Half-lives of nuclides for geological use: 2011 evaluations for U-235 and U-234

Prof. Igor Villa (Institut für Geologie, Universität Bern, CH-3012 Bern, Switzerland; Dipartimento di Scienze Geologiche e Geotecnologie, Università di Milano Bicocca, I-20126 Milano, Italy)

20/09/2011, 08:50

Radioecology and Geochemistry

oral presentation

The IUPAC-IUGS joint Task Group “Isotopes in Gesciences”, TGIG, has evaluated the published measurement results for decay constants (i.e. half-lives) of U-235 and U-234 relative to that of U-238. A measurement result is generally expressed (VIM, 2008, entry 2.9) as a single measured quantity value and a measurement uncertainty. A significant part of the present evaluation was the assessment...

10. Radioecology around a closed uranium mine

Dr Borut Smodiš (Jožef Stefan Institute)

20/09/2011, 09:10

Radioecology and Geochemistry

oral presentation

Uranium mine at Žirovski vrh, Slovenia, operated from 1985 to 1990 and processed about 600,000 tons of uranium ore. The uranium mill tailings (UMT) were deposited onto the Boršt waste pile lying close to the mine, in the subalpine region with relatively high rainfall and within a relatively densely populated area. The mining influential area has been under continuous radiological monitoring...

31. Uranium isotopes as a tracer of groundwater transport studies

Mr Paweł Grabowski (Technical University of Lodz, Department of Chemistry, Institute of Applied Radiation Chemistry)

20/09/2011, 09:25

Radioecology and Geochemistry

oral presentation

The uranium chain radionuclides are usually used for a wide range of application in the Earth Sciences. The 234U/238U activity ratio is used as a geochemical tool to investigate transport and flow relationships in major hydrological reservoirs, groundwater pattern and it is highly useful for interpreting timescales of weathering. In rocks older than a few million years, 234U/238U activity...

48. U-238 in sediments of the Kastela Bay, Adriatic Sea (Croatia)

Dr Ivanka Lovrencic Mikelic (Rudjer Boskovic Institute)

20/09/2011, 09:40

Radioecology and Geochemistry

oral presentation

Distribution of U-238 in sediments of the Kastela Bay near the city of Split (Croatia) to a depth of 50 cm was studied due to an assumed discharge of the TENORM (Technologically Enhanced Naturally Occurring Radioactive Material) in the Bay. Sediment cores, comprising 604 samples, were taken on 95 stations and sliced into eight segments. U-238 massic activities were measured by...

132. Plutonium speciation during sorption on natural clay

Prof. Tobias Reich (Johannes Gutenberg-Universität Mainz)

20/09/2011, 09:55

Radioecology and Geochemistry

oral presentation

Plutonium will be a major contributor to the radiotoxicity of spent nuclear fuel after storage times of more than 1,000 years due to the long half-lives of Pu-239 and Pu-240. Several European countries are considering argillaceous rocks as potential host rock formation for high-level nuclear waste repositories. Plutonium has a very rich and complex chemistry in aqueous solution, where up to...

114. A system for radwaste storage real-time monitoring: lab and real tests

Dr Paolo Finocchiaro (INFN)

20/09/2011, 10:10

Radioecology and Geochemistry

oral presentation

A prototype array of modular sensors for online monitoring of radioactive waste was developed at INFN-LNS. With the main purpose of counting gamma radiation, we implemented a new kind of mini-sensor, based on Silicon PhotoMultipliers and scintillating fibres, that behaves like a cheap scintillating Geiger-Muller counter. It can be replicated, for instance, in shape of a fine grid around each...

194. Principle and procedure for the baseline radiation risk assesment to the non human biota of tropical ecosystem: an elaborative approach at Domiasiat, India

Kumar Niranjan (North-Eastern HilL University Shillong Meghalaya)

20/09/2011, 10:25

Radioecology and Geochemistry

oral presentation

Radiation risk assessment in the radio ecological world is a crucial and complex process. The uncertainty associated with this need to be sort out. A closed system of natural forest of 5 kms at the baseline level is taken into account. The varying radiation level was observed and the generic machine data were simulated and the detail scenario characterization has been conducted using ten...