Decay ofRn220andRn222

Abstract
A gamma ray of energy 510±2 kev and approximate intensity 7×104 quanta per decay is emitted in the alpha decay of Rn222. A gamma ray of energy 542±2 kev and approximate intensity 2.5×104 quanta per decay is emitted in the alpha decay of Rn220. The intensities are considered accurate only to within a factor of two.

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