Half-life determination of 213 Bi and 209 Pb by means of Cherenkov counting and detection with a NaI detector.

Autor: Takács MP; Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany. Electronic address: marcell.takacs@ptb.de., Kossert K; Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2021 Jan; Vol. 167, pp. 109425. Date of Electronic Publication: 2020 Sep 19.
DOI: 10.1016/j.apradiso.2020.109425
Abstrakt: An 225 Ac source was prepared and combined with a dedicated setup to collect recoil atoms which are ejected as a consequence of alpha decay. Some targets were made of acrylic glass and were then placed in custom-built triple-to-double coincidence ratio (TDCR) counters to measure the Cherenkov counting rates as a function of time. Half-lives of 213 Bi and 209 Pb were derived from the data. In addition, polyethylene films were used as targets to collect recoil atoms. These films were then measured in a well-type NaI detector to detect gamma rays. The analysis of the data yielded an independent result for the half-life of 213 Bi. Combining the results of both measurement techniques, T 1/2 ( 213 Bi) = (45.60 ± 0.09) min was obtained as a final value for the half-life of 213 Bi. The half-life of 209 Pb was found to be T 1/2 ( 209 Pb) = (195.1 ± 2.6) min.
(Copyright © 2020 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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