Abstract
The methodology recently developed by the Nuclear Metrology Laboratory (LMN) from IPEN, in Sao Paulo, Brazil, for simulating all detection processes in a coincidence system by means of the Monte Carlo technique is described. This procedure makes possible to predict the behavior of the observed activity as a function of the detector efficiency. The present paper describes its application to the standardization of a typical beta-gamma radionuclide, namely Cs. In this approach, infor- mation contained in the decay scheme is used for determining the contribution of all radiations emitted by the selected radionuclide to the measured spectra of each detector. This simulation yields the shape of the coincidence spectrum, allowing the choice of suit- able gamma-ray energies for which the activity can be obtained with maximum accuracy. The theoretical work applies the MCNP Monte Carlo code to a gas-flow proportional counter with de- tection geometry, coupled to a pair of NaI(Tl) crystals. The calcu- lated extrapolation curve showed good agreement when compared to experimental values obtained at the LMN of IPEN.
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