3min chapter

Plain English cover image

Missing: radioactive capsule the size of a pea

Plain English

CHAPTER

Rio Tinto's Sesium-137 Capsule

Sesium-137 is a radioactive metal that releases beta and gamma radiation. Industrial gauges use tiny capsules to measure the density of certain materials. The capsule was dangerous, and anyone who saw it should stay at least 5 meters away and call authorities. Rio Tinto couldn't just forget about it, they needed to get it back.

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