As of 2026-09-11 · the last 10 years
Thallium’s research intensity has fallen to about 34% of its all-time peak, a level reached in 1991, which lies outside this ten-year window.
Research intensity ran from about 48% of the element's own all-time peak in 2016 to about 34% in 2026 — a steady decline, and the all-time peak (1991) lies before this window. Over the same span its share of research attention across all elements fell. Among the 118 elements, thallium has a larger-than-average research literature.
The number of papers involving the element rose from about 1,383 in 2016 to about 2,313 in 2025 (1.67x). That is slower than the literature as a whole grew over the same years, so the element lost ground in the wider body of research even as its own count rose.
The core of thallium research is defined by Thallium Remediation, Toxicology and Environmental Fate. This community focuses on efficient removal of thallium from wastewater and mining areas, often utilizing adsorption techniques and atomic absorption analysis. Thallium is central to this community, with about 67% of its papers involving the element. Its share of thallium-specific research has risen, growing from about 37% in the first half of the window to about 48% in the current period. A key recent contribution is a 2025 review on remediation of emerging inorganic contaminants using biochar, cited about 30 times, alongside a 2026 study on robust removal of thallium(I) from water using nano-MnO2 implanted hydrogels, cited about 5 times.
A second significant area is Thallium Biomarkers in National Health Surveys, a subcommunity within broader heavy metal toxicology. These papers analyze urinary thallium levels and metal mixtures in national cohorts to assess adult exposure and associations with liver disease. Thallium is a minor presence in this much larger community, with under 1% of its papers involving thallium. Its share of thallium research has remained steady at about 7%. Notable work includes a 2020 study on heavy metals in Nairobi drainage channels, cited over 700 times, and a 2022 analysis of biological aging and urinary metals in U.S. adults, cited over 210 times.
The third material community is Thallium-201 Myocardial Perfusion Imaging and Prognosis, situated within cardiac imaging. This work focuses on thallium-201 scintigraphy and washout rates for assessing myocardial perfusion. Thallium is a minor presence here, with about 5% of the community's papers involving the element. Its share of thallium research has remained steady at about 2.6%, despite a slight drop from 7.4% in the earlier period. Anchor papers include a 2020 Brazilian cardiology guideline update, cited about 30 times, and a 2017 study on prognostic implications of normal exercise thallium images, cited about 46 times.
Overall, the composition of thallium research has shifted toward remediation and environmental fate, which gained share, while the share held by other smaller communities declined. The element's literature is consolidating around its role as a contaminant to be removed rather than a tool for imaging or a minor biomarker.
For a deeper look at the current state of thallium research, see the element's Last 12 Months report or Executive Brief.
What changed in the past year: new papers, shifting applications, emerging collaborators. See the momentum over a shorter window than the decade view.
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