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Published on: May 3, 2019
Measurement of the (211)Pb half-life using recoil atoms from (219)Rn decay
P M Aitken-Smith1, S M Collins1
1National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
Abstract:
The radioactive half-life of (211)Pb was measured, by α-particle counting of samples of radiochemically pure (211)Pb in equilibrium with its α-emitting progeny, (211)Bi and (211)Po. The samples were prepared by the collection of (215)Po recoil atoms from the decay of the (219)Rn decay progeny produced from a (223)Ra sample onto stainless steel discs. The radioactive decay of the (211)Pb was measured utilising a 2π proportional counter operating on the α plateau. A half-life of 36.164 (13)min was determined, which is in agreement with currently available literature. A full uncertainty budget is presented. A recommended half-life of T1/2((211)Pb)=36.161 (17)min has been evaluated from the current literature values.
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