Medusa (IMAGE) University of California - San Diego Caption The Medusa gas chromatograph/mass spectrometer is used to analyze amounts of gases in air. Mühle used the device to track amounts of the fumigant sulfuryl fluoride in the atmosphere. Credit Scripps Institution of Oceanography, UC San Diego 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.