Abstract
Abstract Density measurement by γ-rays can be performed based on two principles: transmission and scattering. In the present work, MCNP4C Monte Carlo code was used for simulations of different configurations of density measurement instruments based on the mentioned principles. Results of simulation showed that regarding to higher attenuation slope and also counting rate, the transmission-based technique is more sensitive to density change than the scattering modality. A laboratory setup was applied for benchmarking of the simulation results. A gamma source of 22 Na with 20 μCi activity, by a 4-in. NaI(Tl) scintillation detector and a 16 cm (in diameter) PVC tube with 0.3 cm wall thickness, and also in another by a 1-in. CsI(Tl) scintillation detector and a 6 cm PVC tube were used in these experiments. Experimental results showed that in practical conditions, salt solutions such as NH 4 Cl·H 2 O, NaCl·H 2 O and also some other liquids with the density in the same range can be distinguished from each other with the accuracy of 0.01 g/cm 3 .
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