The tall concrete vent stack, which filtered radiation from air released from the plant, demonstrates the difficulty ahead for PG & E . The inside of the base of the stack, where its contamination is the heaviest, is saturated with cesium _ the same element found in radioactive fallout from bombs _ at 100, 000 times the level found naturally in the surrounding ground.
2.
The tall concrete vent stack, which filtered radiation from air released from the plant, demonstrates the difficulty ahead for PG & AMP; E . The inside of the base of the stack, where its contamination is the heaviest, is saturated with cesium _ the same element found in radioactive fallout from bombs _ at 100, 000 times the level found naturally in the surrounding ground.
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