HistoMag Sensitivity (IMAGE) University College London Caption Data recorded on a test sample comprising 1 ìg of iron per square mm, illustrating the sensitivity (ca. 10 ng per square mm) and spatial resolution (ca. 1 mm) of the existing prototype. Credit London Centre for Nanotechnology 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.