Doping the Hot Spring (IMAGE) Washington State University Caption Washington State University researchers 'spike' a Yellowstone hot spring with deuterium, a stable isotope, to calculate water and heat flowing out of the springs and estimate how fast magma is recharging beneath the Yellowstone supervolcano. The material had no environmental impact and was done with a permit from the National Park Service. Credit Washington State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.