title: Thoron experimental room at the National Institute of Radiological Sciences (NIRS), Japan.
abstract: A new thoron ((220)Rn) experimental room (TER) was established at National Institute of Radiological Sciences in 2011 to respond to the appearance of new passive devices for (220)Rn and its progeny ((212)Pb, (212)Bi) measurement. The room volume is 21.7 m(3) with a low air exchange rate, 0.016 h(-1). Environmental parameters, such as temperature, relative and absolute humidities, wind speed, aerosol distribution and concentration, are monitored, but not controlled. Commercially available lantern mantles (500 pcs), which can generate maximum concentrations of 6000 Bq m(-3) of (220)Rn and 2000 Bq m(-3) of its progeny, are used as a (220)Rn source. Based on preliminary results from the TER, stable and homogenised concentrations of (220)Rn and its progeny can be ensured; therefore, in the near future the room will be used for testing measuring instruments.
authors.affiliation: National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba-shi 263-8555, Japan. norbert@fml.nirs.go.jp
authors.forename: N
authors.initials: N
authors.lastname: Kavasi
authors.forename: M
authors.initials: M
authors.lastname: Janik
authors.forename: G
authors.initials: G
authors.lastname: Prasad
authors.forename: Y
authors.initials: Y
authors.lastname: Omori
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: H
authors.initials: H
authors.lastname: Yonehara
mesh_terms: D000396:Air Pollutants, Radioactive; D016902:Air Pollution, Indoor / Q000032:analysis*; D002138:Calibration; D004867:Equipment Design; D007564:Japan; D011834:Radiation Monitoring / Q000592:standards*; D011874:Radiometry / Q000379:methods / Q000592:standards*; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis; D015203:Reproducibility of Results; D012306:Risk; D013696:Temperature; D013997:Time Factors
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon