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- W4200548959 abstract "A89Zr solution was measured by means of liquid scintillation counting techniques in order to determine the activity concentration. Two methods were used: the CIEMAT/NIST efficiency tracing method with 3H as a tracer, and the triple-to-double coincidence ratio method. The counting efficiencies were computed with a stochastic model. The very detailed investigation showed that a few corrections are particularly important: Asymmetries in the photodetector responses as well as the backscattering of high-energy gamma rays must be taken into account. Corresponding corrections have therefore been applied. In addition, a detailed uncertainty analysis was carried out and the uncertainties compared with those determined by other research groups. The activity concentrations obtained from the two methods agree well and a combined result was used to establish calibration factors for ionization chambers, which are important secondary standardization instruments. The ionization chambers were combined with a new high-precision current measurement device to provide outstanding linearity. Measurement data from one chamber were used to determine the half-life, which was found to be T1/2=(78.373 ± 0.023) h." @default.
- W4200548959 created "2021-12-31" @default.
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- W4200548959 date "2022-03-01" @default.
- W4200548959 modified "2023-10-16" @default.
- W4200548959 title "Activity standardization by means of liquid scintillation counting and determination of the half-life of 89Zr" @default.
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- W4200548959 doi "https://doi.org/10.1016/j.apradiso.2021.110078" @default.
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