Uran - Extraction from 250 ml water

Application Note: DOC 411-016

U-238 can be extracted from water with modified MaxiLight added with a few per cent (6 %) of a complexing agent, such as e.g. bis(2-ethylhexyl)-phosphate (HDEHP), trioctylphosphine oxide (TOPO) or tributyl phosphate (TBP). Before extraction, water is thoroughly bubbled to remove Rn-222 and made acidic with nitric acid. According to literature, these agents are rather effective so that a few milliliters of the modified cocktail can extract over 90 % of U from one liter of water. LLoD in 1 hour: 1 μg/l or 0,01 Bq (U -238) / l

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Dissolved gases as natural tracers in karst hydrogeology; radon and beyond

Heinz Surbecka

Gases present in the atmosphere or produced in the soil dissolve in rainwater and then are transported by percolation down to the saturated zone. Of particular interest are gases like radon and CO2 that have a well delimited place of production and that can be measured continuously in the field. Both are mainly produced in the soil, but have different chemical and physical properties. Radon decays with a half live of about 4 days whereas CO2 reacts with the carbonate on its way down to the saturated zone. Temporal variations of their concentrations in underground rivers or in spring water can thus be used to gain information about

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LSC as Powerful and Fast Tool for In-situ Measurement of Natural Radionuclides in Water

Application Note: DOC 411-013

When natural radionuclides have to be determined in water samples sampling and sample conservation during transport to the laboratory generally is considered as main cause for errors. Especially when Radon and its Progenies are investigated on site analysis is advantageous. Various measuring principles using different nuclides for the estimation of the Radon level aggravate the assessment of results.

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Liquid scintillation determination of uranium (234U/238U) from water by coctail extraction

Application Note: DOC 411-008

It has been shown that the complexing agent bis(2- ethylhexyl)phosphoric acid (HDEHP) can be added to commercial lipophilic diisopropylnaphthalene (DIN) based liquid scintillation cocktails, making them able to extract uranium and other actinides from water (ref. 1). Ideally, the water pH should be adjusted between 1-2. Suitable cocktails are, e.g., OptiScint HiSafe and Betaplate Scint from Wallac, added with a few per cent of HDEHP. A few milliliters can efficiently extract uranium from several hundreds of milliliters of water.

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Alpha and Beta separation results with Triathler

Application Note: DOC 411-019

Alpha – Beta separation is performed by the method of pulse length index; long alpha pulses are measured in the alpha channel, the significant shorter beta – pulses in the beta channel. The above figure (above) shows a typical Rn-222 spectrum, performed by Triathler™. In the 2-D spectrum (down) x – axis is energy, y–axis is pulse length and z – axis is intensity. The horizontal line is the pulse length index PLI, which discriminates alpha and beta pules, the vertical lines correspond with the windows settings for alphas (top) and beta windows settings (down).

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