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After a nuclear power plant accident, researchers found radioactive isotopes of iodine, tellurium, and cesium—but no heavy isotopes—in the atmosphere downwind. ████ ████████ ████ ██████ ████ █████ ████ ████ ██ ████ ███ ███████ █████ █████ ████ ████ █████ ███████ ███████████ ██████████ ██ █████████ █████████ ███████████ ████████ ███████ ████ ███ ██████████ ████████ ████ ███ ████ █████ ███████ █████ █████████ █████ ███ █████████ ██████ █████ ███ ████ ████ ██ ███████ ████ ███ █████ ███ ████████ ████ ███ ██████ ███ ████ ████████ ███████ ██████████ ███ ██████ █████████ █████ ███ ██████ █████████ ██ ██████
Summary
After a nuclear power plant accident, radioactive isotopes of iodine, tellurium, and cesium were found in the atmosphere downwind. No heavy isotopes were found. The material either came from spent fuel rods or the plant’s core. Spent fuel rods never contain significant quantities of tellurium, and radioactive material ejected directly from the core would include heavy isotopes. However, steam which may have been in contact with the core was released from the plant. The core contains iodine, tellurium, and cesium, which are easily dissolved by steam.
Strongly Supported Conclusions
The radioactive material found in the atmosphere was carried by the steam released from the plant.
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Of the following statements, which ███ ██ ████ ████████ █████████ ██ ███ ███████████ ██████
a
Radioactive material ejected ████ ███ ███████████ ████████ ████ █ ███████ █████ ███████ ████ █████ ███ ███████ █████████ █████████
b
The radioactive material ████████ ██ ███ ███████████ ███ ███████ ████ ███ ██████████ ██ ███ █████ ████ ███ ████████ ████ ███ ██████
c
The nuclear power ███████ █████ ████ ████ ████ ███ ████████
d
The researchers found ████ ███████████ ████████ ████ █████ ████ ████ ██ ████ ██ ████ ████████ ████ ███ ███████ ████ ███ ██████████ ████████ ████ ███ ███████ █████
e
Spent fuel rods ██ ███ ███████ █████ ████████ ██ ███████████ ███████████