title: Correlation effect in activity measurement of 59Fe
abstract: Correlation effects due to the cascade transition of gamma-rays with gates on the relevant peaks have been studied in activity measurement of 59Fe using the bi-dimensional coincidence counting method. Extrapolation curves were obtained at three gamma gates of 1099.2 keV, 1291.6 keV, and that covering both photo-peaks by a computer discrimination method. Of these extrapolation curves, only that obtained at (950-1350) keV gamma gate shows a linear variation, but those of two single gamma gates are not linearly varied in the high efficiency region. This nonlinearity obtained at the gamma gate of 1099.2 keV photo-peak was caused by the correlation effects due to 1-3 coincidence relation via unobserved 192 keV gamma-ray transitions.
authors.affiliation: Korea Research Institute of Standards and Science, Yusong, Taejon. tspark@kriss.re.kr
authors.initials: TS
authors.lastname: Park
authors.initials: HY
authors.lastname: Hwang
authors.initials: JM
authors.lastname: Lee