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Radiation is also not suspected. "Last month, preliminary radiation testing results were announced which indicate radiation exposure is likely not a factor,” Burek-Huntington said. “Further … testing is occurring this spring. Results will be made publicly available as soon as the analyses are completed."
"Part of the reason it doesn't rule it out is we need to do more in-depth tests for Cesium 137 and Cesium 134," Speegle said.
...likely not a factor,”
1. To prevent; preclude: The snowstorm ruled out their weekly meeting.
2. To remove from consideration; exclude: The option of starting over has been ruled out.