title: Absolute calibration of 60Co by using sum-peak method and an HPGe detector.
abstract: The sum-peak method was applied to calibrate four 60Co sources in the range of 25-350kBq. An HPGe-based gamma-ray spectroscopy system was used, and the effects of the angular correlation and pulse pile-up were corrected, and are discussed. The correction for the angular correlation was obtained from a theoretical calculation, while the pulse pile-up effect was corrected using a new extrapolation technique based on the pile-up measurements by varying the shaping time of the amplifier. The determined radioactivities were within 2% deviation from the values reported by the supplier and the associated uncertainties were less than 2%. The observed consistency was obtained under the experimental condition of keeping the total counting rate <or=15kcps.
authors.affiliation: Department of Nuclear Engineering, Seoul National University, South Korea. vandegra@gong.snu.ac.kr
authors.forename: I J
authors.initials: IJ
authors.lastname: Kim
authors.forename: C S
authors.initials: CS
authors.lastname: Park
authors.forename: H D
authors.initials: HD
authors.lastname: Choi