Radioactive Noble Gases in the Terrestrial Environment

Florkowski, T.; Różański, Kazimierz

doi:10.1016/b978-0-444-42225-5.50016-4

Cited by 4 publications

(9 citation statements)

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“…The highest energy a-particle occurring in these chains is only 8.78 MeV ( from the decay of 212 Po in the thorium chain), which is below the threshold energy for the (a, n) reaction in 16 0, 28 Si and 40 Ca which make up about 79% of the earth's crust by weight [73]. Thus The rate of neutrons emitted from 1 kg of natural U by spontaneous fission has been estimated by several authors and the average value quoted in [73] is 16 neutrons/kg/s. Thus a U concentration in rock of 1 ppm corresponds to a production rate of 0.5 neutrons/g/y.…”

Section: Chaptermentioning

confidence: 92%

“…The uranium and thorium concentration found in rock varies substantially, depending on composition. Feige [71] takes as representative of the earth's crust [72], a uranium and thorium concentration of 37 Bq/kg and 45 Bq/kg respectively, while Florkowski et al [73] give typical values of 62 Bq/kg (U) and 45 Bq/kg (Th) for granite, 12 Bq/kg (U) and…”

Section: Environmental Radioactivitymentioning

confidence: 99%

“…Hadronic component of cosmic rays taken from[76]. Neutrons from natural radioactivity taken from[73]. Neutrons from /z~ capture estimated using Equation 4.7.…”

mentioning

confidence: 99%

“…Furthermore, the neutron flux that is present also depends on the neutron attenuation properties of the rock itself. Since the exact composition of the surrounding rock was unknown, typical values given by Florkowski et al[73] were used:…”

mentioning

confidence: 99%

“…Singer also reports that 16.2% of the emitted neutrons have energies above 11.5 MeV while 28.7% of the emitted neutrons have energies above 7.73 MeV. This leads to a spectrum of the form:Florkowski et al[73] estimate the neutron production rate in the rock by muon interac-…”

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confidence: 99%

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Development of a Low Background Environment for the Cryogenic Dark Matter Search

Silva¹

1996

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In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission.

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Section: Chaptermentioning

confidence: 92%

Section: Environmental Radioactivitymentioning

confidence: 99%

“…Hadronic component of cosmic rays taken from[76]. Neutrons from natural radioactivity taken from[73]. Neutrons from /z~ capture estimated using Equation 4.7.…”

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Development of a Low Background Environment for the Cryogenic Dark Matter Search

Silva¹

1996

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Release of anthropogenic xenon to the atmosphere: a large-scale isotope dilution

Yetunde¹,

Mayer²,

Valkiers³

et al. 1996

International Journal of Mass Spectrometry and Ion Processes

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Multi‐Tracer Groundwater Dating in Southern Oman Using Bayesian Modeling

Rädle

Kersting

Schmidt

et al. 2022

Water Resources Research

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In the scope of assessing aquifer systems in areas where freshwater is scarce, estimation of transit times is a vital step to quantify the effect of groundwater abstraction. Transit time distributions of different shapes, mean residence times, and contributions are used to represent the hydrogeological conditions in aquifer systems and are typically inferred from measured tracer concentrations by inverse modeling. In this study, a multi‐tracer sampling campaign was conducted in the Salalah Plain in Southern Oman including CFCs, SF6, 39Ar, 14C, and 4He. Based on the data of three tracers, a two‐component Dispersion Model (DMmix) and a nonparametric model with six age bins were assumed and evaluated using Bayesian statistics. In a Markov Chain Monte Carlo approach, the maximum likelihood parameter estimates and their uncertainties were determined. Model performance was assessed using Bayes factor and leave‐one‐out cross‐validation. Both models suggest that the groundwater in the Salalah Plain is composed of a very young component below 30 yr and a very old component beyond 1,000 yr, with the nonparametric model performing slightly better than the DMmix model. All wells except one exhibit reasonable goodness of fit. Our results support the relevance of Bayesian modeling in hydrology and the potential of nonparametric models for an adequate representation of aquifer dynamics.

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Radioactive Noble Gases in the Terrestrial Environment

Cited by 4 publications

References 40 publications

Development of a Low Background Environment for the Cryogenic Dark Matter Search

Development of a Low Background Environment for the Cryogenic Dark Matter Search

Release of anthropogenic xenon to the atmosphere: a large-scale isotope dilution

Multi‐Tracer Groundwater Dating in Southern Oman Using Bayesian Modeling

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