Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.3390/w12113083
Lizenz creative commons licence
Titel (primär) Absolute measurement of thoron in surface waters
Autor Lane-Smith, D.; Schubert, M.
Quelle Water
Erscheinungsjahr 2020
Department CATHYD
Band/Volume 12
Heft 11
Seite von art. 3083
Sprache englisch
Keywords environmental tracer; thoron; 220Rn; radon; 222Rn; groundwater discharge
Abstract Thoron (radon-220, 220Rn, half-life 55.6 s) is a useful aqueous tracer suitable for applications such as locating and measuring groundwater discharge in surface waters (including the coastal ocean) and detecting radium-224 (224Ra) bearing scale inside water pipes. Generally, such applications require only relative thoron measurements in the water. However, if a thoron-in-water quantification in absolute numbers is desired the knowledge of the thoron sensitivity of the measurement system is obligatory. Absolute readings would, e.g., give a measure of the 224Ra activity in the sediment, supporting the thoron, or of the quantity of 224Ra in the pipe scale. Since there is no standardised source of thoron-in-water (such as a NIST standard), there is no way to calibrate a thoron-in-water measurement system, in the usual sense. Up until now, therefore, it has not been possible to make absolute measurements of thoron in water. This paper presents a novel method of assessing the sensitivity of a mobile thoron-in-water measurement system. The paper analyses such systems and describes a straightforward experimental approach to obtain all setup-specific values of critical parameters that will allow a reasonably precise determination of the system thoron sensitivity. The method is simple enough that a thoron sensitivity calibration can be performed on site with no additional equipment.
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Lane-Smith, D., Schubert, M. (2020):
Absolute measurement of thoron in surface waters
Water 12 (11), art. 3083 10.3390/w12113083