Results 21 to 30 of about 735 (123)

The thallium isotope composition of carbonaceous chondrites - New evidence for live Pb-205 in the early solar system [PDF]

, 2010
The extinct radionuclide 205Pb, which decays to 205Tl with a half-life of 15 Ma, is of considerable cosmochemical interest, as it is the only short-lived isotope that is produced exclusively by s-process nucleosynthesis.
Williams, HM, A.N. Halliday, M. Rehkämper, Halliday, AN, Baker, RGA, Schönbächler, M., Williams, H. M., Rehkamper, M, M. Schönbächler, R.G.A. Baker, Halliday, Alex, Rehkämper, M., Halliday, A. N., H.M. Williams, Schonbachler, M, Baker, R. G. A.   +15 more
core   +2 more sources

Calculation of radiological risks for selected soil samples from the north of Kufa district in Najaf, Iraq

Journal of the Pakistan Medical Association
Objective: To evaluate radioactivity levels in soil samples and their physical impact on the population. Methods: The experimental radiation study was conducted in northern Kufa, Al Najaf Governorate, Iraq, in March 2020 by researchers from the Kufa ...
Shaymaa Awad Kadhim, Shahla Alruhaimi, Shatha Alhous, Qassim Shamkhi AL–Khafaji   +3 more
doaj   +1 more source

Improved Constraints on Andean Glaciations From the Lake Titicaca Continental Drilling Record

Paleoceanography and Paleoclimatology, Volume 41, Issue 6, June 2026.
Abstract Long sedimentary records from tropical lakes provide crucial archives for reconstructing the timing and extent of tropical alpine glaciations, yet robust chronologies beyond the radiocarbon limit (ca. 50 ka) remain scarce. Here, we refine the ca. 350 kyr chronology for Lake Titicaca (Peru‐Bolivia) using radiocarbon dating, optically stimulated
Victoria L. Todd, Timothy M. Shanahan, Daniel Stockli, Axel K. Schmitt, Steven Forman, Sherilyn C. Fritz, Paul A. Baker, Geoffrey O. Seltzer   +7 more
wiley   +1 more source

Quantitative gas-phase separation of carrier-free thallium radioisotopes from proton-irradiated $^{nat}$HgO

Journal of radioanalytical and nuclear chemistry
ISSN:0236 ...
Wilson, Jennifer M., Herrmann, Dominik, Grundler, Pascal V., Van der Meulen, Nicholas P., Sommerhalder, Alexander, Steinegger, Patrick; id_orcid0000-0002-5054-0924   +5 more
openaire   +3 more sources

Fe–Mn Crust δ98Mo Decline Records Tectonic Forcing on Marine Oxide Sink Reduction During the Early Eocene–Early Oligocene

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract S, Tl, and W isotope records document pronounced early Eocene shifts in marine redox, yet the absence of a Mo isotope record obscures its progression. Here, we present ∼80 Myr Mo–Os–Be–Nd isotope profiles from a Northwest Pacific hydrogenetic Fe–Mn crust, revealing a systematic δ98Mo decline from −0.24‰ (early Eocene) to −0.83‰ (early ...
Limin Zhang, Jiangbo Ren, Hongjin Chen, Haozhe Wang, Zhen Sun, Yong Yang, Huodai Zhang, Zhenquan Wei, Lixue Zhang, Yingzhi Ren, Gaowen He   +10 more
wiley   +1 more source

Event‐driven shifts in river and reservoir sediment sources: Cottonwood River and John Redmond Reservoir, USA

Earth Surface Processes and Landforms, Volume 51, Issue 4, April 2026.
In‐channel flow events are dominated by streambank sediment (50%) whereas downstream lakebed deposits are dominated by cropland sources (40%). This shift in sediment provenance is event‐driven: during infrequent, out‐of‐bank flood events, vast quantities of floodplain cropland soil are mobilized in exceedance of the river's bank‐dominated internal load.
Anthony L. Layzell, Cayden E. Lloyd, Abigal Percich, Ted D. Harris, Michael E. Ketterer, Admin Husic   +5 more
wiley   +1 more source

Ultrasmall Au10–12 Nanoclusters: A Novel Platform for 223Ra‐Targeted Tumor α‐Therapy

Exploration, Volume 6, Issue 2, April 2026.
Encapsulating 223Ra in Au10‐12 nanoclusters and functionalizing them with RGD peptides enables targeted α‐therapy and immune microenvironment remodeling in non‐osseous tumors like triple‐negative breast cancer. This study establishes a foundational framework for novel 223Ra‐labeled α‐radiopharmaceuticals and shows strong potential for clinical ...
Yifei Jiang, Huizhen Yang, Guoping Jia, Wangxi Hai, Rongyi Huang, Peng Wang, Min Zhang, Danni Li, Yizhou Chen, Xiao Li, Biao Li, Chunfu Zhang   +11 more
wiley   +1 more source

Determination of a Proper Covering Material for Fixture-Abutment Microleakage Evaluation Using Radiotracers and Gamma-Counter; A Pilot Study

Journal of Islamic Dental Association of Iran, 2013
Background and Aim: Radioisotopes adhere to any surface in which they come in contact. Covering the sample surface with a suitable material prior to submersion and isolation of the material before counting make it possible to evaluate the penetrating ...
Mahnaz Arshad, Hakimeh Siadat, Babak Fallahi, Hosain Mahgoli   +3 more
doaj  

Silesaurid (Archosauria: Dinosauriformes) remains from the base of the Dockum Group (Late Triassic: Otischalkian) of Texas provide new insights to the North American record of dinosauriforms

The Anatomical Record, Volume 309, Issue 2, Page 293-313, February 2026.
Abstract Silesaurids (Archosauria: Dinosauriformes) are found in Middle to Upper Triassic deposits across Pangea, but few stratigraphic sections record the evolution of the group in one geographic area over millions of years. Here, we describe silesaurid remains from the oldest of the Upper Triassic stratigraphic sequence from the base of the Dockum ...
Frederick B. Tolchard, Brynden W. Perkins, Sterling J. Nesbitt   +2 more
wiley   +1 more source

Exploring CPP Enhanced Hypoxia Targeting: An Approach Using Radiolabeled 2‐nitroimidazole TAT Conjugate

Drug Development Research, Volume 87, Issue 1, February 2026.
ABSTRACT Mediated by their protein transduction domain, cell‐penetrating peptides (CPPs) have been widely explored for facilitating intracellular delivery of drugs and small molecules. In this study, a radiolabeled, 2‐nitroimidazole conjugated TAT (TAT ‐ transactivator of transcription) peptide was prepared and evaluated for targeting tumor hypoxia ...
Sweety Mittal, Akanksha Jain, Ashwini Babu, Chandan Kumar, Madhava B. Mallia   +4 more
wiley   +1 more source