This study seeks to enhance the accuracy of industrial radiographic testing by addressing discrepancies between theoretical and experimental measurements of geometric penumbra dimensions. The analysis revealed significant deviations between theoretical predictions and actual penumbra values. Based on these findings, a correction factor for geometric penumbra was developed, depending on the material thickness used in radiographic testing. This correction factor was incorporated into exposure time equations, improving the precision of radiographic inspections and ensuring higher-quality imaging. Correction factors were established for various material thicknesses and voltage settings, uncovering variations influenced by these parameters. Diagrams were developed to facilitate accurate determination and practical application of the correction factors, contributing to advancements in industrial radiographic practices. For specimens with a thickness of 8 mm, the discrepancy between theoretical and experimental penumbra was found to be 11.11%. While this error may seem minor, applying the correction factor increased the required exposure time by 27.27%, underscoring the substantial impact of these adjustments on inspection precision. Additionally, the study highlights the influence of X-ray equipment variability and aging on inspection reliability, emphasizing the necessity for continuous correction methodologies. By addressing these challenges, this research aids in extending equipment lifespan and maintaining consistent accuracy in radiographic testing. The findings provide valuable insights into material quality assurance and radiographic testing techniques, representing a significant advancement in the evaluation of welded materials for Quality Control applications.