Abstract
By bombarding the natural thorium targets with 14 MeV neutrons, 229Ra was produced through the reaction 232Th(n,α)229Ra. The radium activities were separated from the irradiated targets by coprecipitation with BaCl2. A total of 18 weak γ rays with energies of 14.5, 15.6, 18.8, 21.8, 22.5, 44.0, 47.5, 55.0, 63.0, 69.6, 93.6, 94.1, 98.5, 102.2, 104.5, 106.1, 161.1, and 171.5 keV, which could be assigned to the decay of 220Ra, has been observed in the isolated radium fractions employing high-resolution HPGe detectors and γ(x)-γ coincidence methods. A decay scheme of 229Ra based on these observations has been proposed.
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