title: In vivo measurements of 210Pb in skull and knee geometries as an indicator of cumulative 222Rn exposure in a underground coal mine in Brazil.
abstract: Cumulative exposure to radon can be evaluated by measuring 210Pb in bone. The skull and knee are two convenient parts of the skeleton for in vivo measuring 210Pb because these regions of the body present a high concentration of bone, the detectors are easily positioned and the likelihood of cross contribution from other organs or tissues is low. A radiological survey of non-uranium mines in Brazil indicated that an underground coal mine in Paraná, located in the south of Brazil, exhibited a high radon concentration. In vivo measurements of 32 underground coal miners were performed in the IRD-CNEN Whole Body Counter shielded room using an array of four high-resolution germanium detectors. Estimations of 210Pb in the total skeleton were determined from direct in vivo measurements of 210Pb in the head and knees. In vivo measurements of 210Pb in 6 out of 32 underground coal miners ranged from 80 to 164 Bq, suggesting that these workers were significantly exposed to 222Rn.
authors.affiliation: Instituto de Radioproteção e Dosimetria, CNEN, Av. Salvador Allende s/n, Rio de Janeiro, CEP 22780-160, Brazil. adantas@ird.gov.br
authors.forename: A L A
authors.initials: AL
authors.lastname: Dantas
authors.forename: B M
authors.initials: BM
authors.lastname: Dantas
authors.forename: J L
authors.initials: JL
authors.lastname: Lipsztein
authors.forename: H B
authors.initials: HB
authors.lastname: Spitz
mesh_terms: D000465:Algorithms; D001681:Biological Assay / Q000379:methods; D001938:Brazil; D003031:Coal; D003198:Computer Simulation; D006801:Humans; D038622:Internationality; D007719:Knee Joint / Q000378:metabolism*; D007856:Lead Radioisotopes / Q000032:analysis / Q000378:metabolism*; D008906:Mining; D008954:Models, Biological; D016273:Occupational Exposure / Q000032:analysis*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods; D011886:Radon / Q000032:analysis / Q000378:metabolism*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012886:Skull / Q000378:metabolism*; D014915:Whole-Body Counting / Q000379:methods*
chemical_list: D003031:Coal; D007856:Lead Radioisotopes; D011886:Radon