When is uranium and thorium not radioactive Summary: RSU INF 2021-08 When is uranium and thorium not radioactive Type: Guideline Owner: Radiation Safety Unit   This document requires CAS authentication Contact email: ian.haslam@manchester.ac.uk Last modified: 12/03/2026 Link to this document: https://documents.manchester.ac.uk/display.aspx?DocID=57329 Edit (only Administrators)