Dosimetric assessment from 212Pb inhalation at a thorium purification plant.
At the Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, Brazil, there is a facility (thorium purification plant) where materials with high thorium concentrations are manipulated. In order to estimate afterwards the lung cancer risk for the workers, the thoron daughter (212Pb) levels were assessed and the committed effective and lung committed equivalent doses for workers in place. A total of 28 air filter samples were measured by total alpha counting through the modified Kusnetz method, to determine the 212Pb concentraion. The committed effective dose and lung committed equivalent dose due to 212Pb inhalation were derived from compartmental analysis following the ICRP 66 lung compartmental model, and ICRP 67 lead metabolic model.
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Instituto de Pesquisas Energéticas e Nucleares, Divisão de Radiometria Ambiental, Av. Prof. Lineu Prestes, 2242, Cidade Universitária 05508-900, São Paulo, SP, Brazil. mpcampos@ipen.br
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D000280:Administration, Inhalation; D000396:Air Pollutants, Radioactive / Q000032:analysis / Q000493:pharmacokinetics; D001822:Body Burden; D001938:Brazil / Q000453:epidemiology; D006801:Humans; D007856:Lead Radioisotopes / Q000008:administration & dosage / Q000032:analysis* / Q000493:pharmacokinetics*; D008168:Lung / Q000378:metabolism*; D016273:Occupational Exposure / Q000032:analysis*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods*; D011874:Radiometry / Q000379:methods*; D012062:Relative Biological Effectiveness; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D013910:Thorium / Q000008:administration & dosage / Q000032:analysis / Q000302:isolation & purification / Q000493:pharmacokinetics
D000396:Air Pollutants, Radioactive; D007856:Lead Radioisotopes; D013910:Thorium