NEW YORK (CBSNewYork) – There’s been a spike in radioactive material discovered in groundwater beneath the Indian Point nuclear power plant, WCBS 880 reported.

The Nuclear Regulatory Commission and Entergy, which operates the plant, are trying to locate the source of the tritium.

Two monitoring wells picked up a spike in levels of the isotope in groundwater and bedrock under the plant in March, WCBS 880’s Sean Adams reported.

The source of the tritium is a bit of a mystery, Adams reported. It could be related to movement of spent fuel back in March.

The highest level of tritium has dropped substantially but is still above normal, the Journal News reported.

The NRC said the level is at a relatively low level and is not considered a major public health threat.

Tritium can be found in luminescent watches and exit signs.

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