What is the fine-grained topic of the following text: As the principal investigator and technical lead for the Radiation Portal Monitoring Project at PNNL, Kouzes guided the project team’s work to define the threat of illicit radioactive and nuclear materials at U.S. borders on behalf of U.S. Customs and Border Protection, identify the equipment needed, and initiate the modeling and testing activities that led to the successful deployment of radiation detection equipment along the country’s borders. Only return the topic.
Radiation Portal Monitoring Project at PNNL led by Kouzes for detecting illicit radioactive materials at U.S. borders