Some aspects of $sup 212$Pb and $sup 232$Th airborne contamination in a monazite ore mill (in Portuguese)
Thesis/Dissertation
·
OSTI ID:4363986
ABS>Thesis. Sampling for measurements of airborne radioactivity is performed to assess the possible radiation hazards associated with the ore processing. Since the major contaminant (/sup 220/Rn) has a short half-life (54 s), the degree of radioactive contamination in the working atmosphere is determined through measurement of airborne /sup 212/Pb, which is the /sup 220/Rn decay product with the longest half-life (10.64 h). High volume air samplers (Staplex) and Whatman-41 filter paper are employed to collect airborne particles and the total alpha activity is determined for all samples by means of the ZnS(Ag) scintillator method. Long-lived activity on the filters is found to be due to finely divided monazite particles. Highest levels of /sup 212/Pb and monazite particles in the atmosphere are found in chemical and physical treatment areas of the plant, respectively. (INIS)
- Research Organization:
- Rio de Janeiro Univ. (Brazil). Instituto de Biofisica
- NSA Number:
- NSA-29-015364
- OSTI ID:
- 4363986
- Report Number(s):
- INIS-mf--944
- Country of Publication:
- Brazil
- Language:
- Portuguese
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Related Subjects
*LEAD 212-- RADIATION MONITORING
*MONAZITES-- ORE PROCESSING
*THORIUM 232-- RADIATION MONITORING
AEROSOL MONITORING
AIR
AIR FILTERS
AIR SAMPLERS
CONTAMINATION
ENVIRONMENT
INDUSTRIAL PLANTS
N40240* --Chemistry--Inorganic
Organic
& Physical Chemistry--Feed Materials Processing
N44200 --Environmental & Earth Sciences--Radioactive Effluents
N44300 --Environmental & Earth Sciences--Radioactivity Monitoring & Transport
RADIOACTIVITY
RADON 220
*MONAZITES-- ORE PROCESSING
*THORIUM 232-- RADIATION MONITORING
AEROSOL MONITORING
AIR
AIR FILTERS
AIR SAMPLERS
CONTAMINATION
ENVIRONMENT
INDUSTRIAL PLANTS
N40240* --Chemistry--Inorganic
Organic
& Physical Chemistry--Feed Materials Processing
N44200 --Environmental & Earth Sciences--Radioactive Effluents
N44300 --Environmental & Earth Sciences--Radioactivity Monitoring & Transport
RADIOACTIVITY
RADON 220