BOISE, Idaho (AP) — A small amount of radioactive, weapons-grade plutonium about the size of a U.S. quarter is missing from an Idaho university that was using it for research, leading federal officials on Friday to propose an $8,500 fine.

The U.S. Nuclear Regulatory Commission said Idaho State University can't account for about a 30th of an ounce (1 gram) of the material that's used in nuclear reactors and to make nuclear bombs.

NEW YORK (AP) — Twelve hospitals and research institutions in New York City have agreed to replace devices that contain radiologic material that could be used in a "dirty bomb" attack.

The initiative, announced by the city's health and police departments, focuses on devices used for preparing blood transfusions and cancer research.

Two machines already have been removed and 28 others will be replaced by 2023.

MOUNT PLEASANT, S.C. (AP) — A person who raised alarms about a possible "dirty bomb" on a container ship approaching the port of Charleston in South Carolina was being questioned Thursday after searches found nothing dangerous.

Coast Guard Lt. James Zorn said the Charleston office received a telephone call about a "dirty bomb" aboard the Maersk Memphis container ship around 8 p.m. Wednesday. The ship docked about a half-hour later.

ALBANY, N.Y. (AP) — U.S. Sen. Charles Schumer is calling on the Nuclear Regulatory Commission to overhaul its licensing protocol for obtaining radioactive materials, citing a recent report that a fictitious company got a license for enough material for a dirty bomb.