We demonstrate the first evidence of radioactivity-synchronized fluorescence quenching of a near-infrared light-emitting dye by a radionuclide, (64)Cu, and subsequent fluorescence enhancement upon (64)Cu decay to the daughter isotopes (64)Ni and (64)Zn. The dynamic switch from high radioactivity and low fluorescence to low radioactivity and high fluorescence is potentially useful for developing...

Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years R. Marsh, M. P. L. M. Smith, E. J. Rohling, D. J. Lunt, T. M. Lenton, M. S. Williamson, and A. Yool National Oceanography Centre, University of Southampton, UK Bristol Research Initiative for the Dynamic Global Environment (BRIDGE), School of Geographical Sciences, University of Bristol, UK School ...

Plutonium isotopes have primarily been injected to the stratosphere by the atmospheric nuclear weapon tests and the burn-up of the SNAP-9A satellite. Here we show by using published data that the stratospheric plutonium exponentially decreased with apparent residence time of 1.5 ± 0.5 years, and that the temporal variations of plutonium in surface air followed the stratospheric trends until the...

Natural waters’ carbon isotopes content is an important parameter in many environmental studies, as it hints to the water’s origin and history. Atmospheric water contain a certain amount of dissolved carbon dioxide, in the form of oxygen, hydrogen and carbon through their various species (CO2, HCO3 & CO3), which are commonly used for isotopic characterization of natural water [1]. Carbon posses...

A successfull application of Geiger-mode multipixel avalanche diodes (GMAPDs) for pulse-shape discrimination in alpha-beta spectrometry using organic liquid scintillator is described in this paper. Efficient discrimination of alpha and beta components in the emission of radioactive isotopes is achieved for alpha energies above 0.3 MeV. The ultra-compact design of the scintillating detector help...

Incorporation of dihydroretinals into the sensory rhodopsin SR and bacteriorhodopsin bR has led to a modified version of the external point-charge model for bR proposed in 1979. Difference Fourier transform infrared studies of native bR and bR analogs cultured on media containing isotopes of amino acids have shown some of the amino acids which undergo environmental changes or deprotonation/prot...

Hydrogen stable isotopes (dH) are used for quantifying resources supporting food webs. However, application of dH in mixing models requires; (1) correction for environmental water (x) in consumer tissues, (2) consideration of differential fractionation among biochemical constituents, and (3) consideration of differential H-exchange among samples and standards. We present data and sensitivity an...

Concentrations and species of iodine isotopes ((127)I and (129)I) provide vital information about iodine geochemistry, environmental conditions and water masses exchange in oceans. Despite extensive investigations of anthropogenic (129)I in the Arctic Ocean and the Nordic Seas, concentrations of the isotope in the Atlantic Ocean are, however, still unknown. We here present first data on (129)I ...

This study aims to use the environmental isotopes technique evaluate interaction between groundwater and surface water at a location two cities in southwest of Iraq; namely Al-Kifl Al-Samawa. The salinity Euphrates River increases sharply as it passes this area, level that affects its usage for municipal purposes. A total 111 samples were collected from rivers, drainages, springs, shallow deep ...