Sample Introduction (IMAGE) DOE/Pacific Northwest National Laboratory Caption Khadouja Harouaka (seated) and Isaac Arnquist prepare samples in an ultra-clean laboratory, which is necessary to ensure accurate mass spectrometry measurements. Credit (Photo by Andrea Starr | Pacific Northwest National Laboratory) 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.