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Published on: May 3, 2019
Determination of 226Ra Activity Using Gamma Spectrometry with 226Ra-222Rn Disequilibrium
Qi Li1, Shilian Wang, Yungang Zhao
1*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.
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.
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