Tracking Chernobyl's fading footprint in Turkish forests

# **Chernobyl’s Lingering Shadow: A 28-Year Study of Radioactive Cesium in Türkiye’s Mosses and Lichens**

Three decades after the catastrophic Chernobyl disaster, scientists have revisited a silent witness to its fallout—mosses and lichens across **Ordu province in Türkiye**. In a meticulous study spanning nearly three decades, researchers returned to **50 sites** first surveyed in **1997**, then again in **2007**, and most recently in **2025**.

### **The Unseen Legacy: Cesium-137 Persists, But Nature Fights Back**

This time, the findings revealed a mixed picture:
- **Nearly half of the moss samples** still contained measurable traces of **cesium-137**.
- **About one in seven lichen samples** showed contamination.
- **Higher elevations** retained more of the radioactive isotope, likely due to **cooler, wetter conditions** that slow natural washout processes.

### **The Race Against Time: How Fast Is Nature Cleansing Itself?**

The team tracked the decay rate of cesium in these plants:

Mosses shed half their cesium every 4.4 years—a rate consistent with the 1997–2007 period.
Lichens are now cleaning up faster than before, though still more rapidly than the element’s natural half-life of 30 years.

This accelerated reduction suggests environmental factors, not just radioactive decay, are driving the decline. The plants themselves, through biological and chemical processes, are helping to remediate the contamination.

A Glimpse into the Future: Lessons from a 28-Year Experiment

For residents nearby, the news is reassuring:

Cesium levels are now so low that experts consider the health risk negligible.

Yet the study’s true value lies in its long-term insights. This 28-year dataset offers a rare glimpse into how nature copes with man-made pollution—a blueprint that could predict outcomes after future nuclear accidents or industrial spills.

As the world grapples with environmental legacies, this research stands as a testament to resilience—both in nature and in science’s ability to uncover its secrets.

A Glimpse into the Future: Lessons from a 28-Year Experiment

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