Gamma Pro: NDT Radiography

The professional tool for NDT radiographers and RT technicians.

Gamma Calculator is an industrial radiographic technique calculator built for field use. Whether you're setting up weld inspections on carbon steel pipe, calculating isotope decay for your Ir-192 source, or validating geometric unsharpness against ASME Section V limits — Gamma Calculator delivers accurate results in seconds.

Built on real radiographic physics and compliant with ASME Section V, ISO 17636-1, and ISO 17636-2, this is the tool that replaces manual lookups, dog-eared exposure charts, and spreadsheets on the job site.

EXPOSURE TIME CALCULATOR

The core of every radiographic technique. Input your isotope, source activity, material thickness, SFD, and technique type — Gamma Calculator returns exposure time using table-driven calculations, the same approach used by professional RT departments worldwide. Supports Ir-192, Co-60, Se-75, and Yb-169.

ISOTOPE DECAY CALCULATOR

Know your source strength at any point in time. Select your isotope, enter the original activity and calibration date, and the app automatically calculates current activity, decay percentage, and remaining source strength. No manual elapsed-day math — pick dates, get results.

GEOMETRIC UNSHARPNESS (Ug)

Calculate Ug using the standard formula (f × b / a) and get instant PASS/FAIL validation against ASME Section V limits. Supports source size, SFD, and OFD inputs. The app internally converts SFD to source-object distance — the way professional radiographic software behaves.

EXPOSURE CORRECTION CALCULATOR

Changed your SFD mid-job? The inverse square law correction instantly recalculates exposure time for any new distance, without re-running the full technique.

BARRICADE DISTANCE CALCULATOR

Estimate safe exclusion zone distances based on isotope gamma constant, source activity, and permitted dose rate. Supports Ci, TBq, mR/hr, and μSv/hr with automatic unit conversion.

PIPE SCHEDULE REFERENCE

Full ASME B36.10M (carbon steel) and B36.19M (stainless steel) pipe schedule database built in. Select NPS and schedule to instantly retrieve OD, wall thickness, and ID — essential for determining effective thickness before setting up your technique.

SINGLE WALL / DOUBLE WALL TECHNIQUES

Full support for SWSI, DWDI, and DWSI technique types. Each technique correctly adjusts effective material thickness, radiation path, and exposure parameters. Weld reinforcement (weld cap) is included in all effective thickness calculations.

TECHNIQUE SHEET GENERATOR

Generate a complete radiographic technique summary — isotope, activity, SFD, Ug, exposure time, pipe schedule, material thickness, and technique type — ready to document or hand off.

STANDARDS COMPLIANCE

ASME Section V — geometric unsharpness, SFD, IQI

ISO 17636-1 — film radiography

ISO 17636-2 — digital radiography

ASME B36.10M / B36.19M — pipe schedules

UNITS

Full metric and imperial support. All internal calculations use SI units; display units convert on the fly.

BUILT FOR THE FIELD

Fast, focused interface designed for job site use. Every calculation is one tap away — no digging through menus.

Gamma Calculator is designed for certified Level II and Level III radiographic testing (RT) personnel. Always validate results against applicable codes and site-specific procedures.