Document Detail

Unexpected 226Ra build-up in wet-process phosphoric-acid plants.
MedLine Citation:
PMID:  6282784     Owner:  NLM     Status:  MEDLINE    
During an investigation of the distribution of radium and uranium over the different process streams in phosphoric-acid production and in the nitrophosphate route, a higher than average radiation level was detected in the vicinity of some piping and vessels near the gypsum filtres. This higher radiation level is caused by radium, which, as a decay product in the 238U series, is present in very low concentrations (1-50 pCi 226R/g) in the phosphates used for fertilizer production. Specific research later on established that there were detectable radiation levels around vessels and piping in other phosphoric-acid works as well. It turned out that in all factories the filter part, and especially the washing-acid section showed the highest radiation-level. In the piping of the gypsum filter, through which the washing acid is discharged, a scaling of bariumsulphate and calciumsulphate with a higher radiumconcentration (+/- 0.1 Ci/g) is formed. The radium ions appeared to be incorporated in the bariumsulphate lattice, hence the solubility of the radium precipitate is very low. The danger of internal pollution, for example in cleaning operations by radio-active intake or inhallation of radon is very small in the cases described. The risk of external radiation can be prevented by periodically cleaning (every 1-3 yr) the equipment in which the radio-active scaling is formed.
M H Lardinoye; K Weterings; W B van de Berg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Health physics     Volume:  42     ISSN:  0017-9078     ISO Abbreviation:  Health Phys     Publication Date:  1982 Apr 
Date Detail:
Created Date:  1982-08-14     Completed Date:  1982-08-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  2985093R     Medline TA:  Health Phys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  503-14     Citation Subset:  IM    
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MeSH Terms
Chemical Industry*
Environmental Exposure
Phosphoric Acids*
Radiation Dosage
Reg. No./Substance:
0/Fertilizers; 0/Phosphoric Acids; 7440-14-4/Radium

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