Abstract
The activity concentration of a 125I solution has been measured by a X-(X, γ) coincidence counting method and an extrapolation of a linear function of the associated efficiency curve. Two thin NaI(Tl) scintillation detectors were mounted on a horizontal rail, and the efficiency curve was obtained by systematically changing the distance between the source and movable detectors. All sum-coincidence events were recorded with a counting window set between 10 and 100 keV. The disintegration rate was measured and the data expressed in terms of a linear function so that the activity concentration of 125I could be determined by extrapolation. A high-purity germanium detector (Ortec Gamma-X) was also used to determine an emission probability of 0.0668 ± 0.0013 (1 σ) for the 35.5 keV gamma ray of 125I.
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