title: Improved method for the assessment of ⁶⁰Co and ¹³⁴Cs point sources in samples with non-homogeneous matrix.
abstract: The correlation method (Suvaila et al., 2013) is extended to the assessment of (60)Co and (134)Cs point sources embedded in non-homogeneous samples. Experimental data reveal a strong correlation between the efficiency ε(1173 keV) and the ratio of the count rate R in the sum peak of 2505 keV and in the peak of 1332 keV. The correlation pattern and the measured R(2505)/R(1332) give unbiased values for ε(1173 keV), independent of source position and sample matrix. Monte Carlo simulations for (60)Co and (134)Cs support this conclusion.
authors: Horia Hulubei National Institute for Physics and Nuclear Engineering, 077125 Magurele, Romania.
authors: Rares
authors: R
authors: Suvaila
authors: Physics Department, University of Bucharest, 077125 Magurele, Romania. Electronic address: Octavian.Sima@partner.kit.edu.
authors: Octavian
authors: O
authors: Sima
authors: IAEA Environment Laboratories, 4a Quai Antoine 1er, Monte Carlo 98000, Monaco.
authors: Iolanda
authors: I
authors: Osvath
keywords: (60)Co and (134)Cs point sources; Correlation method; Gamma-ray spectrometry; Monte Carlo simulation; Non-homogeneous samples