The purification and the quality control of 68Ga eluates from 68Ge/68Ga generator

摘要

The gamma ray spectrometry laboratory of the University of Bucharest was designedfor the analysis of low-level radioactivity samples. High efficiency shielded HPGe detectors are used.Efficiency calibration is achieved by complementing experimental calibration with Monte Carlocomputation carried out using GESPECOR, also applied for the evaluation of coincidence summingcorrections. Low detection and decision limits are challenging, and the method to respond to thissituation is presented. Using a blank sample in the same experimental conditions as the actual sampleturns out benefic for precise peak subtraction. Procedures for peak finding were developed, whichinclude analysis of the peak area/FWHM ratios, hypergeometric alert, in order to establish confidencelimits concerning the actual existence of a certain peak in the spectrum. The method is oriented tonumeric solutions rather than developing complex fitting functions that might not be appropriate.Development of a software insuring retrospective predictability and asking for human intervention incontroversial situations is in progress.