MONTE CARLO APPROACH to EVALUATE the SMALL ANGLE SCATTERING EFFECTS in COLLIMATED BEAM by GAMMA TRANSMISSION TECHNIQUE
Le Hoang Minh, Van Thi Thu Trang, Tran Thien Thanh
Journal of Nuclear Science and Technology
ABSTRACT
This study introduces a Monte Carlo simulation method to remove small-angle scattering from gamma transmission spectra. Using MCNP-CP v3.2, it employs a collimated 137Cs source emitting a 662 keV gamma narrow beam, targets of varying thickness, and a NaI(Tl) detector. Fitting curves from simulation data determine attenuation coefficients, showing less than 1% difference from XCOM values. The small angle scattering increases nonlinearly with thickness, especially in denser materials. By separating unscattered and scattered components, this method achieves less than 0.5% error across all thicknesses. These findings underscore the efficacy of the method in addressing small-angle scattering in gamma transmission research.
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