skip to main content

Title: Distribution of sup 137 Cs in soils due to the Goiania accident and decisions for remedial action during the recovery phase

In September 1987, a powder radioactive source was removed from a teletherapy machine in Goiania, Brazil. Subsequently, it was ruptured in a residential garden causing the dissemination of {sup 137}Cs throughout the city. Soil resuspension processes and burial of contaminated house waste in unused gardens were the major contributors to the Cs dissemination in soils at the secondary contaminated sites. Only locations within a radius of 50 m from the primary contaminated sites presented the need for remedial action. The radiation dose-rate measurements and the soil profiles were good indicators of the extent of the secondary contamination and were fundamental for the decisions taken regarding decontamination procedures. In cases of surface contamination, 60% on average of the total activity remained in the upper 1.5-cm layer over the first 5 mo after the accident, and topsoil removal proved to be an effective procedure for decontamination.
Authors:
; ; ; ; ; ; ; ;  [1]
  1. (Instituto de Radioprotecao e Dosimetria/CNEN, Rio de Janeiro (Brazil))
Publication Date:
OSTI Identifier:
6076195
Resource Type:
Journal Article
Resource Relation:
Journal Name: Health Physics; (USA); Journal Volume: 60:1
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; BRAZIL; RADIATION ACCIDENTS; CESIUM 137; RADIOECOLOGICAL CONCENTRATION; SOILS; RADIONUCLIDE MIGRATION; DECISION MAKING; RADIATION MONITORING; REMEDIAL ACTION; ACCIDENTS; ALKALI METAL ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; DEVELOPING COUNTRIES; ECOLOGICAL CONCENTRATION; ENVIRONMENTAL TRANSPORT; ISOTOPES; LATIN AMERICA; MASS TRANSFER; MONITORING; NUCLEI; ODD-EVEN NUCLEI; RADIOISOTOPES; SOUTH AMERICA; YEARS LIVING RADIOISOTOPES 540230* -- Environment, Terrestrial-- Radioactive Materials Monitoring & Transport-- (1990-)