Analysis of environmental radioxenon detections in the UK

Goodwin, Matthew A.; Davies, A. V.; Britton, R.

doi:10.1016/j.jenvrad.2021.106629

Cited by 12 publications

(1 citation statement)

References 17 publications

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“…The leaves of higher plants usually contain β-carotene, lutein, violaxanthin and neoxanthin, with small amounts of other carotenoids, such as the yellow ones [8]. These carotenoids are found in chloroplasts linked to the thylakoid membranes, mainly in their non-esterified form [9,10]. In photosynthetic tissues, the color of the carotenoids is masked by the green color of the chlorophylls, since that is found in greater proportion [11].…”

Section: Introductionmentioning

confidence: 99%

Changes in the Carotenoids of Zamia dressleri Leaves during Development

Murillo,

Nagy,

Menchaca

et al. 2024

Plants

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It has been observed that the leaves of some Zamia species undergo a kind of “reverse ripening”; that is, they change from their original brown color to green during development. We assumed that this strange color change was due to the change in carotenoid composition, so we followed the changes for several weeks. The detailed carotenoid composition and content at different stages of development of the leaves was determined with HPLC-DAD focusing on the changes in red and yellow carotenoids. The total and relative amounts of red and yellow carotenoids were determined simultaneously from one measurement from a saponified and/or unsaponified extract. At the beginning of development, the concentration of red carotenoids was higher than that of the yellow ones; it decreased drastically until 22 days and continued to decrease slowly until they completely disappeared. The concentration of yellow carotenoids decreased at the beginning as well, but after 22 days it started to increase. The amount of red carotenoids started to decrease when the leaflet stopped growing. Lutein is the main component in old leaflets, which is not a red carotenoid precursor. Red carotenoids can always be found in their esterified form in the leaves. These findings support the hypothesis that red and yellow carotenoid accumulation are independent and probably have different functions in the leaflet. The strange color change was explained based on the compartmentalization of red and yellow carotenoids and on the changing activity of the enzyme capsanthin–capsorubin synthase responsible for the synthesis of red carotenoids capsorubin and capsanthin.

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Section: Introductionmentioning

confidence: 99%

Changes in the Carotenoids of Zamia dressleri Leaves during Development

Murillo,

Nagy,

Menchaca

et al. 2024

Plants

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A Software Package for Radionuclide Detection Event Analysis

Chester

Goodwin

Davies³

et al. 2022

Pure Appl. Geophys.

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Characterising the Radionuclide Fingerprint of an Advanced Gas-Cooled Nuclear Power Reactor

Goodwin,

Petts,

Milbrath

et al. 2024

Pure Appl. Geophys.

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Radionuclides are monitored in the atmosphere for the signatures of nuclear explosions, as part of the verification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Civil nuclear facilities, such as Nuclear Power Plants (NPPs) and Isotope Production Facilities (IPFs) are sources of anthropogenic radionuclides in the atmosphere and these signatures are sometimes indistinguishable to those of a nuclear explosion. In order to improve the understanding of civil radionuclide-emitting facilities and their impact on the International Monitoring System (IMS) of the CTBT, a group of scientists from the UK, US and Sweden are collaborating with EDF Energy UK to measure radionuclide emissions from an Advanced Gas-cooled Reactor (AGR) nuclear power station. Emissions are being measured at the source, via a stack monitor and high-resolution gamma spectrometry measurements of filters and also at tens of kilometres away via three sensitive radioxenon atmospheric samplers. The timing, isotopic composition, activity magnitudes and other release parameters of interest are investigated, to improve the discrimination between a civil radionuclide release and an explosive nuclear test. This paper outlines the work of the Xenon and Environmental Nuclide Analysis at Hartlepool (XENAH) collaboration, describes the equipment fielded and provides initial results from each measurement campaign.

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Analysis of environmental radioxenon detections in the UK

Cited by 12 publications

References 17 publications

Changes in the Carotenoids of Zamia dressleri Leaves during Development

Changes in the Carotenoids of Zamia dressleri Leaves during Development

A Software Package for Radionuclide Detection Event Analysis

Characterising the Radionuclide Fingerprint of an Advanced Gas-Cooled Nuclear Power Reactor

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