The impact of source-to-film distance on the accuracy of beta-ray surface density measurement

Finally, the optimized source-side single collimator geometry was experimentally validated by reproducing SFD variations and recalculating measurement deviations. [Results]Initial experimental measurements revealed that 1 mm SFD variation caused a maximum measurement deviation of 13.3% in surface density values. Monte Carlo simulations demonstrated that the source-side single collimator configuration minimized scattering effects, showing the smallest mean absolute deviation among all three geometries tested.

Experimental validation confirmed this improvement, with the maximum deviation decreasing from 13.3% to 3.5% after device optimization. [Conclusions]By adopting a source-side single collimator, the study achieved a 73.7% reduction in measurement error caused by SFD variations, providing a practical solution for enhancing online surface density measurement accuracy in lithium battery production.