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Updated: May 24, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Disintegration rate and gamma ray emission probability per decay measurement of 123I
M F Koskinas1, K C Gishitomi, A B Brito
1Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, Centro do Reator de Pesquisas-CRPq, C.P. 11049, Pinheiros, 05422-970-São Paulo-SP, Brazil. koskinas@ipen.br
Abstract:
A series of (123)I measurements have been carried out in a 4π(e(A),X)-γ coincidence system. The experimental extrapolation curve was determined and compared to Monte Carlo simulation, performed by code ESQUEMA. From the slope of the experimental curve, the total conversion coefficient for the 159 keV total gamma transition, α(159), was determined. All radioactive sources were also measured in an HPGe spectrometry system, in order to determine the gamma-ray emission probability per decay for several gamma transitions. All uncertainties involved and their correlations were analyzed applying the covariance matrix methodology and the measured parameters were compared with those from the literature.
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