Laser Setup (IMAGE) Physikalisch-Technische Bundesanstalt (PTB) Caption PTB scientist Johannes Thielking with the laser setup for measurements of the thorium-229 nuclear properties. Credit (Photo: PTB) 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.