title: Decommissioning a phosphoric acid production plant: a radiological protection case study.
abstract: During a preliminary survey at the area of an abandoned fertilizer plant, increased levels of radioactivity were measured at places, buildings, constructions and materials. The extent of the contamination was determined and the affected areas were characterized as controlled areas. After the quantitative and qualitative determination of the contaminated materials, the decontamination was planned and performed step by step: the contaminated materials were categorized according to their physical characteristics (scrap metals, plastic pipes, scales and residues, building materials, etc) and according to their level of radioactivity. Depending on the material type, different decontamination and disposal options were proposed; the most appropriate technique was chosen taking into account apart from technical issues, the legal framework, radiation protection issues, the opinion of the local authorities involved as well as the owner's wish. After taking away the biggest amount of the contaminated materials, an iterative process consisting of surveys and decontamination actions was performed in order to remove the residual traces of contamination from the area. During the final survey, no residual surface contamination was detected; some sparsely distributed low level contaminated materials deeply immersed into the soil were found and removed.
authors.affiliation: Greek Atomic Energy Commission, Ag. Paraskevi, Greece.
authors.forename: V
authors.initials: V
authors.lastname: Stamatis
authors.forename: S
authors.initials: S
authors.lastname: Seferlis
authors.forename: V
authors.initials: V
authors.lastname: Kamenopoulou
authors.forename: C
authors.initials: C
authors.lastname: Potiriadis
authors.forename: V
authors.initials: V
authors.lastname: Koukouliou
authors.forename: K
authors.initials: K
authors.lastname: Kehagia
authors.forename: C
authors.initials: C
authors.lastname: Dagli
authors.forename: S
authors.initials: S
authors.lastname: Georgiadis
authors.forename: L
authors.initials: L
authors.lastname: Camarinopoulos
mesh_terms: D002133:Calcium Sulfate / Q000032:analysis / Q000302:isolation & purification; D003252:Construction Materials; D052918:Environmental Restoration and Remediation / Q000331:legislation & jurisprudence / Q000379:methods*; D005308:Fertilizers; D010756:Phosphoric Acids / Q000032:analysis* / Q000302:isolation & purification; D010758:Phosphorus / Q000032:analysis* / Q000302:isolation & purification; D010944:Plants; D011835:Radiation Protection / Q000331:legislation & jurisprudence / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D013051:Spectrometry, Gamma
chemical_list: D005308:Fertilizers; D010756:Phosphoric Acids; D011868:Radioisotopes; D012989:Soil Pollutants; C077769:phosphogypsum; D010758:Phosphorus; C030242:phosphoric acid; D002133:Calcium Sulfate