Correction: An earlier version of this story quoted a student who provided a false name. The quote has been removed. HADDON TWP. — Haddon Township High School was evacuated Friday after a student brought in an antique plate that the youth’s mother said was glazed with radioactive uranium. Students and staffers left the building after officials learned around 11:15 a.m. that a student “had brought into the school a potentially dangerous substance,” said Robert J. Fisicaro, the district’s superintendent. “Local police, fire, and a hazardous materials team arrived on the scene and immediately investigated the situation, and secured the building,” he said in a statement.