Tritium at Fermilab

Kress Creek Results

This chart (click chart for larger version) shows the levels of tritium in Kress Creek since January 2006. To date, Fermilab has not detected tritium in Kress Creek. The detection limit is one picocurie per milliliter (see footnote).

Increased monitoring began on Kress Creek following detection of low levels of tritium in Indian Creek in November 2005. The levels of tritium measured in the Fermilab cooling ponds and in Indian Creek are well below federal water standards for tritium. Fermilab continues to monitor the ponds and creeks on its site and take steps to keep the levels of tritium as low as reasonably achievable.

Fermilab will continue to display Kress Creek monitoring results on this page. A frequently-asked-questions page provides more information, and we have posted an aerial view of Kress Creek as well.

State of Illinois agencies have taken water samples from Indian Creek in the past. Comparing those results with Fermilab's results for Indian Creek confirmed the accuracy of Fermilab's measurement system.

About the graph: A solid dot appears on every day in which a sample has been taken and analyzed. Samples with no detectable level of tritium are represented by a solid dot on the line at the limit of detection (1 pCi/ml).

Footnote: A picocurie is the unit used to specify how many tritium particles in a water sample decay into helium particles each second. Standard tests can detect levels of tritium in water that are larger than about 1 picocurie per milliliter. The Department of Energy surface water standards specify a limit of 2600 picocuries per milliliter.