Standardization of the emerging medical positron emitter 89Zr
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89Zr is a beta plus and electron capture decaying radionuclide. This paper presents: (1) Absolute standardization by the 4πβ(PC)-γ coincidence method: a new equivalent decay scheme, the mathematical formalism applied to it and the choice of the optimal measurement conditions. (2) Measurements by HPGe gamma-ray spectrometry, to determine the possible impurities, to measure the activity and the relative intensities of the emitted gamma rays. (3) Calibration of the CENTRONIC IG12/20A ionization chamber, by two methods: direct measurement using the absolutely standardized solution and linear least square modelling, as well as their comparison. (4) Comparisons of results of all measurement methods.
KeywordsPositron emitter 89Zr Absolute standardization 4πβ(PC)-γ coincidence method Gamma-ray spectrometry measurement Calibration of the ionization chamber Comparison of results
This paper was funded by the joint research project IFA Romania – CEA France No. C5-09/2016
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