Professor X. George Xu, the Edward E. Hood Endowed Chair of Engineering, was awarded with the Randall S. Caswell Award for Distinguished Achievements in the Field of Ionizing Radiation Measurements and Standards by the Council on Ionizing Radiation Measurements and Standards (CIRMS) at the National Institute of Standards and Technology (NIST) . This award is named after Dr. Randy Caswell, who as the Chief of the Ionizing Radiation Division at the National Institute of Standards and Technology was instrumental in the formation of CIRMS. The award is based on the awardee’s lifetime achievements in the field of ionizing radiation and contributions and dedication to CIRMS. The CIRMS Executive Committee along with past Caswell Award winners select the award recipients. Dr. Caswell was the first awardee and since 2002 there have been ten other recipients. Prof Xu was chosen for his outstanding contribution to radiation measurements and dosimetry and for his leadership role with the CIRMS/NIST community. Congratulations!