60Fe Sample Preparation and Extraction Method for Measurement with Accelerator Mass Spectrometry
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Abstract
60Fe can be used in the study of the outbreak of supernova, the synthesis of celestial bodies in nuclear astrophysics, as well as the metabolism of iron in the organism as a tracer. As the neutron activation production of the reactor, 60Fe also plays an important role for nuclear facilities and nuclear safety. In accelerator mass spectrometer, the large negative ion beam and the suppression of isotope 60Ni are the key steps to improve the measurement sensitivity of 60Fe. In this work, the process of sample preparation and beam extraction were tested. The beam intensity, suppression of 60Ni, the relationship between the electron affinity and beam current, the choice of conductive medium, and the problems found in the test process were discussed. The series of experiments showed that the sample chemical form of Fe2O3, the ion extraction form of FeO-, and the conducting medium of Ag powder were the best choices for 60Fe AMS measurement.
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