title: Abnormal occurrences for fourth quarter CY 1991; dissemination of information--NRC.
mesh_terms: D006077:Government Agencies; D009684:Nuclear Medicine Department, Hospital / Q000331:legislation & jurisprudence*; D011647:Puerto Rico; D011829:Radiation Dosage; D012308:Risk Management / Q000331:legislation & jurisprudence*; D014481:United States