Abstract
This work aims to calculate the effective atomic number and electron density by Monte Carlo method. In previous studies, the most widely used solution is to use the transmission method with the narrow gamma-ray beam. In the approach of this work, the gamma-ray beam after going through material is uncollimated to recording by NaI(Tl) detector. To do this, the inner diameter of detector collimator was enlarged with the aim of decreasing the strengthen of radioactive source. The obtained results were compared with NIST data and the experimental values which yield the maximum deviation of 9.05% and 3.43%, respectively. These results show the promising approach in determining the features of material.
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