Abstract
We have developed a novel procedure in extracting the energy distribution of radioactive beta emitters that has a direct application in detector energy calibration. The method employs a highly non-uniform magnetic field from a permanent dipole magnet and an array of 12 0.1 × 0.1 × 31 cm 3 scintillating fibers. By scanning the radioactive source across the entire entrance face of the magnet and recording the exit position of the electrons on the dispersive plane, we generated a full 2D map of the energy-position correlation functions. By combining the ADC spectra and a Geant4 simulation of the experimental setup, we were able to reconstruct the entire energy spectrum of a 25 μ Ci 90Sr/ 90Y point source used within a 1.4% accuracy.
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