RT Calculator: Gamma NDT

RT Calculator is an offline field calculator for industrial radiography teams working with Ir-192, Se-75, and Co-60. Estimate gamma exposure time, activity decay, barricade distance, geometric unsharpness, and exposure corrections with saved presets and calculation history. Designed for RT inspectors, NDT technicians, and field engineers, the app keeps common calculations local on your device and helps reuse frequent parameters. Calculations are for professional reference only. Always verify results against approved procedures, source certificates, exposure charts, local regulations, and radiation safety requirements before field use.