title: A method for the determination of thoron and thoron progeny concentration at workplaces and thoron concentration in calibration chambers.
abstract: A new method to determine the air concentration of (220)Rn, commonly referred to as thoron, has been developed. The method is insensitive to the presence of any concentration of (222)Rn. Air turbulence, humidity and temperature do not influence the measurement. This method was primarily developed for field measurement of (220)Rn and (212)Pb concentrations at workplaces in underground environments with high ((222)Rn) concentration, but has the potential to be used for reference measurement of (220)Rn concentration in a calibration facility. The sampling and measurement devices are traceable to international standards. The proposed measuring technique has the potential to contribute to easy and accurate measurements of (220)Rn. This paper describes the method and an example of its use in underground workplaces.
authors: Swedish Radiation Protection Authority (SSI), SE-171 16 Stockholm, Sweden. r.a.falk@bredband.net
authors: R
authors: R
authors: Falk
authors: G
authors: G
authors: Akerblom
authors: Leif
authors: L
authors: Nyblom
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D000465:Algorithms; D002138:Calibration; D003198:Computer Simulation; D008962:Models, Theoretical; D016273:Occupational Exposure / Q000032:analysis* / Q000592:standards; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D011886:Radon / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013548:Sweden; D014462:Ultrafiltration / Q000295:instrumentation* / Q000379:methods / Q000592:standards
chemical_list: D000396:Air Pollutants, Radioactive; D011886:Radon