title: Determination of 226Ra Activity Using Gamma Spectrometry with 226Ra-222Rn Disequilibrium.
abstract: Radium-226 (Ra) activity is normally determined indirectly by gamma spectrometry, in particular by measuring the characteristic γ-ray emitted from its progeny (Pb and Bi) when Ra-Rn secular equilibrium is reached. This article describes a measurement method involving the measurement of Pb ingrowth. The activity of Ra determined by this method agrees with that measured after Ra-Rn equilibrium. The method of Pb ingrowth allows rapid and sufficiently accurate determination of Ra activity without the need to wait for Ra-Rn equilibrium.
authors.affiliation: *Science and Technology on Nuclear Data Laboratory, China Institute of Atomic Energy, Beijing, 102413, China; †CTBT Beijing National Data Centre and Radionuclide Laboratory, Beijing, 100085, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: Shilian
authors.initials: S
authors.lastname: Wang
authors.forename: Yungang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Shujiang
authors.initials: S
authors.lastname: Liu
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: Fan
authors.forename: Jianfang
authors.initials: J
authors.lastname: Shi
authors.forename: Huaimao
authors.initials: H
authors.lastname: Jia
authors.forename: Weixiang
authors.initials: W
authors.lastname: Yu
mesh_terms: D011883:Radium / Q000032:analysis*; D011886:Radon / Q000032:analysis*; D013051:Spectrometry, Gamma / Q000379:methods*
chemical_list: D011886:Radon; D011883:Radium