A tracer study is a methodological approach that follows a defined cohort, entity, or process over time to track outcomes, pathways, and causal linkages using identifiable “tracers” (e.g., individuals, molecules, interventions, or records). In applied research and program evaluation, tracer studies systematically collect longitudinal or retrospective data to assess the implementation, effectiveness, and downstream effects of policies, training programs, or services. Core methodological elements include cohort definition, tracer selection, follow-up strategies (surveys, record linkage, or monitoring systems), and analytic techniques to characterize trajectories, outcome distributions, and attrition patterns, often informing impact assessment, quality assurance, and system performance monitoring.
Techniques developed to study the distant past—from dating ancient artifacts to reconstructing climate records in ice cores—are now being repurposed to help us better understand the lives of modern sea turtles. Using radiocarbon ...
Plants & Animals
Mar 22, 2026
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32
How is carbon metabolized and processed in different ecosystems? In a study published in the journal Communications Earth & Environment, researchers led by Joely Maak, the study's first author and researcher in the Cluster ...
Earth Sciences
Mar 9, 2026
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11
A research team led by Dr. Chris Baumann and Dr. Dorothée Drucker from the Senckenberg Center for Human Evolution and Paleoenvironment at the University of Tübingen has found that the European wildcat is increasingly using ...
Plants & Animals
Feb 26, 2026
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132
Forensics experts gather DNA to understand who was present at a crime scene. But what if the crime occurred in the middle of a lake, where DNA could be carried far and wide by wind and waves? That's the challenge faced by ...
Ecology
Jan 20, 2026
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383
Beryllium-7 is a radioactive isotope of beryllium produced by cosmic rays in the atmosphere. A Japanese research team has explored, over space and time, how the beryllium-7 is transported from the atmosphere to Earth's surface. ...
Earth Sciences
Nov 18, 2025
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17
A large group of ANSTO environmental scientists and collaborators have produced the first groundwater stable isotopes, "isoscapes," intuitive maps with grid data, across NSW combining new and pre-existing isotope measurements.
Earth Sciences
Oct 30, 2025
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26
Researchers at University of Tsukuba have identified the source and the factors affecting the radioactive cesium (137Cs) flow to the port of the Fukushima Daiichi Nuclear Power Plant via its drainage channels. Using tritium ...
Earth Sciences
Oct 24, 2025
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77
"RUBY"—a cost-effective innovation designed to track gene activity—is proving valuable across a range of fields. It all started with the idea of finding a better way to monitor genes.
Plants & Animals
Sep 30, 2025
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67
A South African university launched an anti-poaching campaign Thursday to inject the horns of rhinos with radioactive isotopes that it says are harmless for the animals but can be detected by customs agents.
Ecology
Jul 31, 2025
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39
By making rhino horns detectable and traceable, the Rhisotope Project aims to create a powerful deterrent for traffickers.
Plants & Animals
Jul 31, 2025
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