Die Löslichkeit des Bleisulfids und Bleichromats

Hevesy, G.; Paneth, Fritz

doi:10.1002/zaac.19130820125

Cited by 111 publications

(29 citation statements)

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“…Hevesy could not separate the two forms of lead but he had the idea to take advantage of this impossibility. Thus, he discovered the use of radioactive isotopes as tracers [11][12][13]. The term "isotope" had not yet been coined, but Hevesy created the application of isotopes.…”

Section: His Life and Workmentioning

confidence: 98%

George de Hevesy (1885–1966), founder of Radioanalytical Chemistry

Niese¹

2006

Czech J Phys

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Section: His Life and Workmentioning

confidence: 98%

George de Hevesy (1885–1966), founder of Radioanalytical Chemistry

Niese¹

2006

Czech J Phys

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“…Comparison of thus obtained activity measurements with those of the equilibrated RaD solution used to prepare the radioactive lead chloride solution yielded the solubility of lead chromate of 1.2.10 -5 g per litre water. This study was carried out at the "Institut ftir Radiumforschung" (Institute for Radium Research) in Vienna, Austria, by Fritz A. Paneth (1887-1958) and Georg von Hevesy (1885Hevesy ( -1966 and published in 1913 [33]. It is actually the very first publication based on the G. von Hevesy's concept of radioactive indicators (radiotracers)!…”

Section: Emanations In Science and Medicinementioning

confidence: 98%

Emanations and “induced” radioactivity: From mystery to (mis)use

Kolář

1999

Czech J Phys

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Radon, Rn; atomic number Z = 85; is a (gaseous) chemical element of which no stable but only radioactive isotopes exist. Three of them, namely actinon (219Rn), thoron (22~ and radon (222Rn) are the decay products of naturally occurring radioisotopes of radium: 223Ra, 224Ra and 226Ra, respectively. The natural Rn isotopes were discovered within the period 1899-1902 and at that time referred to as emanations because they came out (emanated) of sources/materials containing actinium, thorium and radium, respectively. The (somewhat mysterious) emanations appeared to disintegrate into radioactive decay products which by depositing at solid surfaces gave rise to "induced" radioactivity i.e. radioactive substances with various half-lives. Following the discovery of the emanations the volume of the research involving them and their disintegration products grew steeply. The identity of a number of these radioactive products was soon established. Radium-emanation was soon used as a source of RaD (21~ to be applied as an "indicator" (radiotracer) for lead in a study on the solubility of lead sulphide and lead chromate. Moreover, radium and its emanation were introduced into the medical practice. Inhaling radon and drinking radon-containing water became an accepted medicinal use (or misuse?) of that gas. Shortly after the turn of the century, the healing (?) action of natural springs (spas) was attributed to their radium emanation i.e. radon. Bathing in radioactive spring water and drinking it became very popular. Even today, bathing in radon-containing water is still a common medical treatment in J~chymov, Czech Republic.

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“…However, electrical resistivity, as one of these parameters, depends on a variety of material parameters and rock-fluid interactions; therefore the result is not univocal. Other imaging methods apply tracers for labelling, which facilitates detection and quantification of the species (Hevesy and Paneth, 1913;Garrett, 1963). Spatio-temporal visualization of labelled substances requires tomographic methods with selective response to the tracer.…”

Section: Process Tomography Modalitiesmentioning

confidence: 99%

Geoscientific process monitoring with positron emission tomography (GeoPET)

et al. 2016

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Abstract. Transport processes in geomaterials can be observed with input-output experiments, which yield no direct information on the impact of heterogeneities, or they can be assessed by model simulations based on structural imaging using µ-CT. Positron emission tomography (PET) provides an alternative experimental observation method which directly and quantitatively yields the spatio-temporal distribution of tracer concentration. Process observation with PET benefits from its extremely high sensitivity together with a resolution that is acceptable in relation to standard drill core sizes. We strongly recommend applying high-resolution PET scanners in order to achieve a resolution on the order of 1 mm.We discuss the particularities of PET applications in geoscientific experiments (GeoPET), which essentially are due to high material density. Although PET is rather insensitive to matrix effects, mass attenuation and Compton scattering have to be corrected thoroughly in order to derive quantitative values.Examples of process monitoring of advection and diffusion processes with GeoPET illustrate the procedure and the experimental conditions, as well as the benefits and limits of the method.

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Die Löslichkeit des Bleisulfids und Bleichromats

Abstract: Es wurde mit Hilfe von Ra D als Indikator des Bleis die Löslichkeit des Bleichromats bei 25° zu 1.2 · 0−5 g des Bleisulfids bei 25° in reinem Wasser zu 3 · 0−4, in H2S gesättigtem Wasser zu 1.5 · 10−4 pro Liter bestimmt.

Cited by 111 publications

References 0 publications

George de Hevesy (1885–1966), founder of Radioanalytical Chemistry

George de Hevesy (1885–1966), founder of Radioanalytical Chemistry

Emanations and “induced” radioactivity: From mystery to (mis)use

Geoscientific process monitoring with positron emission tomography (GeoPET)

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