FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W379133042> ?p ?o ?g. }

• W379133042 abstract "In the natural decay series of 238 U an inert radioactive gas, 222 Rn (radon) is formed in the decay of 226 Ra. Because radon is relatively soluble in water, it migrates from places of its generation in rocks and soils to other places either by soil air, or travels with underground water. Therefore, there is a growing interest among hydrogeologists in using radon as a natural tracer for investigating and managing fresh water reservoirs. This work is aimed at investigating and developing radon-in-water measuring techniques applicable to aquifers and rivers. A gamma-ray spectrometry method using a hyper-pure germanium (HPGe) detector, based at iThemba LABS, Cape Town and Marinelli beakers, has been optimized to measure radon in borehole water via the γ-rays associated with the decay of radon daughters 214 Pb and 214 Bi (in secular equilibrium with their parent). An accuracy better than 5% was achieved. Moreover, long-term measurements of radon in water from an iThemba LABS borehole have been carried out to investigate the role of radon for characterizing aquifers. These investigations led to the development of a simplified physical model that reproduces the time-evolution of radon concentration with borehole pumping and may be used to estimate the time for representative sampling of the aquifer. A novel method is also proposed in this thesis to measure radon-in-water in the field after grab sampling a so-called quasi in-situ method. The quasi in-situ method involves inserting a γ-ray detector in a container of large volume filled with water of interest. The γ-ray spectra are analyzed using an approach involving energy intervals on the high-energy part of the spectrum (1.3 – 3.0 MeV). Each energy interval corresponds to contributions from one of the major γ-ray sources: 40 K and the decay series of 238 U and 232 Th, and cosmic rays. It is assumed that the U interval will be dominated by γ-rays emitted from the radon daughters (Pb and Bi). Minor contributions to an interval with major radionuclide are corrected using an MCNPX simulated standard spectra. The two methods in this thesis make a significant contribution to measuring and modelling of radon in aquifers and surface waters. It forms a basis for further development in an interactive mode with hydrological applications." @default.
• W379133042 created "2016-06-24" @default.
• W379133042 creator A5020088516 @default.
• W379133042 date "2009-01-01" @default.
• W379133042 modified "2023-09-27" @default.
• W379133042 title "Measurements and applications of radon in South African aquifer and river waters" @default.
• W379133042 cites W1421318289 @default.
• W379133042 cites W1512286896 @default.
• W379133042 cites W1551291783 @default.
• W379133042 cites W1554227100 @default.
• W379133042 cites W1580961126 @default.
• W379133042 cites W1581955135 @default.
• W379133042 cites W1650310283 @default.
• W379133042 cites W1900541854 @default.
• W379133042 cites W1932864841 @default.
• W379133042 cites W1963689244 @default.
• W379133042 cites W1964754874 @default.
• W379133042 cites W1966716536 @default.
• W379133042 cites W1969580460 @default.
• W379133042 cites W1971834850 @default.
• W379133042 cites W1974063968 @default.
• W379133042 cites W1974388326 @default.
• W379133042 cites W1975280464 @default.
• W379133042 cites W1975316065 @default.
• W379133042 cites W1981541227 @default.
• W379133042 cites W1983795433 @default.
• W379133042 cites W1983839835 @default.
• W379133042 cites W1983934819 @default.
• W379133042 cites W1985452815 @default.
• W379133042 cites W1988111350 @default.
• W379133042 cites W1988163817 @default.
• W379133042 cites W1990868335 @default.
• W379133042 cites W1997871841 @default.
• W379133042 cites W1998053418 @default.
• W379133042 cites W1998073425 @default.
• W379133042 cites W1998708595 @default.
• W379133042 cites W2000827060 @default.
• W379133042 cites W2001568217 @default.
• W379133042 cites W2002723431 @default.
• W379133042 cites W2004780240 @default.
• W379133042 cites W2011820778 @default.
• W379133042 cites W2016024479 @default.
• W379133042 cites W2016838378 @default.
• W379133042 cites W2019225477 @default.
• W379133042 cites W2021042201 @default.
• W379133042 cites W2026189030 @default.
• W379133042 cites W2027022461 @default.
• W379133042 cites W2029371308 @default.
• W379133042 cites W2029803396 @default.
• W379133042 cites W2030295205 @default.
• W379133042 cites W2031111932 @default.
• W379133042 cites W2031454542 @default.
• W379133042 cites W2032537038 @default.
• W379133042 cites W2032783468 @default.
• W379133042 cites W2033782944 @default.
• W379133042 cites W2039171310 @default.
• W379133042 cites W2039787627 @default.
• W379133042 cites W2042561368 @default.
• W379133042 cites W2046472734 @default.
• W379133042 cites W2048484753 @default.
• W379133042 cites W2049557951 @default.
• W379133042 cites W2052510253 @default.
• W379133042 cites W2052526406 @default.
• W379133042 cites W2054819558 @default.
• W379133042 cites W2055142608 @default.
• W379133042 cites W2055723296 @default.
• W379133042 cites W2057074930 @default.
• W379133042 cites W2057150285 @default.
• W379133042 cites W2057558086 @default.
• W379133042 cites W2057807317 @default.
• W379133042 cites W2059664889 @default.
• W379133042 cites W2060200491 @default.
• W379133042 cites W2060476131 @default.
• W379133042 cites W2060715345 @default.
• W379133042 cites W2061145457 @default.
• W379133042 cites W2061245175 @default.
• W379133042 cites W2061624874 @default.
• W379133042 cites W2066409352 @default.
• W379133042 cites W2068779623 @default.
• W379133042 cites W2071190356 @default.
• W379133042 cites W2072014187 @default.
• W379133042 cites W2076261494 @default.
• W379133042 cites W2076556071 @default.
• W379133042 cites W2080638615 @default.
• W379133042 cites W2081330868 @default.
• W379133042 cites W2083593017 @default.
• W379133042 cites W2085169124 @default.
• W379133042 cites W2088469328 @default.
• W379133042 cites W2089819622 @default.
• W379133042 cites W2090238157 @default.
• W379133042 cites W2090520696 @default.
• W379133042 cites W2093661392 @default.
• W379133042 cites W2095326338 @default.
• W379133042 cites W2095378720 @default.
• W379133042 cites W2097784325 @default.
• W379133042 cites W2101481791 @default.
• W379133042 cites W2106251549 @default.
• W379133042 cites W2108834494 @default.
• W379133042 cites W2127334943 @default.
• W379133042 cites W2128825414 @default.

• next