In a hearing taking place last week, Department of Veteran's Affairs officials had their feet held to the fire over a prostate-cancer program that gave the wrong radiation doses to veterans for several years at its central Philadelphia hospital. While officials copped to the dosing errors, they vigorously denied that the facility had violated rules on the medical use of radioactive materials. And, in a move that surprised Nuclear Regulatory Commission officials, the VA also withdrew its previous estimates of the number of patients affected by these errors, claiming the actual number was much lower than initially thought. Article