become sources of ionizing radiation, the work was Sisyphean. Even the most gentle summer breeze recirculated dust carrying alpha- and beta-emitting particles into the air. Every rain shower washed radiation from the clouds and flushed more long-lived nuclear isotopes into the ponds and streams. The arrival of autumn would send radioactive leaves skittering across the ground. The Pripyat marshes—the largest swamp in Europe—had become a massive sponge for strontium and cesium, and the vast stretches of agricultural land proved too large to be scraped clean even by squadrons of earth-moving
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