# NDT Nation — Radiography & Weld Inspection

> Radiography & Weld Inspection (iPhone/iPad app by Marcus Cook.)

- Source: https://appshunter.io/ios/app/ndt-nation/id6808320392 (this page in markdown: same URL + `.md`)
- Developer: [Marcus Cook](https://appshunter.io/developer/1883186571)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 7 MB
- Languages: American English
- Released: 2026-09-12
- Data updated: 2026-10-02
- User reviews in markdown: https://appshunter.io/ios/app/ndt-nation/id6808320392/reviews.md

## What is NDT Nation?

NDT Nation is the field reference built by RT people, for RT people: 60 verified calculators, a standards reference library and three full exam-prep banks — all working offline at the shot location.

60 CALCULATORS
• RT — film density by code, R-factors, source decay, exposure correction, geometric unsharpness, boundary estimate, blow factor, wall shot selector, IQI/density check, % sensitivity, HVL attenuation, inverse-square, isotope reference, film development, pipe schedule
• UT / PAUT / TOFD — wavelength, near field, beam spread, Snell's law, angle-beam path, dB/amplitude, attenuation correction, thickness by echo, temperature correction, scan calculator, DAC/TCG helper, wedge refraction, TOFD setup
• MT — coil shot, prod current, yoke lift test, demagnetization check
• ET — depth of penetration, fill factor, phase/impedance, limit frequency
• PT / VT — dwell time and dwell grid, lighting, coverage check
• Welding — heat input, fillet weld size, pipe hi-lo, weld symbols, preheat/interpass, PWHT time and temperature, undercut acceptance, camber
• Materials — carbon equivalent, bolt torque, weld volume, pipe clock position, F#/P# reference, hardness conversion, alloy/PMI reference, unit and temperature conversion

ACCEPTANCE CRITERIA + INDICATION EVALUATION
Pick the code, edition, pipe size and wall thickness and get the tolerance for each anomaly type computed for your actual wall — with a real reference radiograph on the rows that have one. The API 1104 engine evaluates an indication against the individual-length, worst-12-inch aggregate and percent-of-weld-length tests and tells you which one it fails.

FILM INTERPRETATION WITH REAL RADIOGRAPHS
Ten defect categories — incomplete penetration, IP due to high-low, elongated slag, porosity, cracks, burn through, hollow bead, internal and external undercut, incomplete fusion — each with real annotated films you can pinch-zoom, plus what it looks like on film and how it is graded.

REFERENCE LIBRARY
API 510, API 570, API 653, API 571 damage mechanisms, WPS/PQR to ASME IX, PT and UT code guides, PMI guide, CUI/coating and electrode storage — written in our own words from the governing standards and cited, never copied.

EXAM PREP — 750 QUESTIONS
• State card / radiation safety — 200 questions plus study notes and a timed mock on the real blueprint
• CWI — 351 questions plus bullet study cards
• ASNT Level II — 199 questions across UT, RT, MT, PT and ET
Every answer comes with the explanation and the standard behind it.

BUILT FOR THE FIELD
• Fully offline — no signal needed at the shot
• Big-screen mode: mirror your phone to a TV or monitor over AirPlay or HDMI for a film-density readout the whole crew can read across the bay
• Customizable home — pin the tools you use, most-used surface automatically
• Dark, one-hand interface that reads in bright sun or a dark bay

Every formula is built from the governing standard — ASME, API, AWS, ASTM, ASNT, NCRP — and cited, not copied from another app.

Reference only. This app does not replace your governing code, your written procedure or certified personnel. Radiation safety outputs are planning aids: always verify with a calibrated survey meter and follow your radiation safety program.


## Version history (last 4 releases)

### 2.0.2 — 2026-09-16

Film gallery: swipe through all films in a set with new on-screen arrows and a position counter. Fixed reference tables that could run off-screen on phones. Small stability polish.

### 2.0.1 — 2026-09-15

Added a back button to the film gallery and image views — the first thing a tester told us. Every full-screen view now closes with a labelled Back control, a tap outside, or the Esc key, and the control sits clear of the status bar instead of underneath it.

Also in this build: the criteria-check acknowledgement and the full Terms & Disclaimer screen that went live on the web after 2.0 shipped.

Small fixes from tester feedback — keep it coming.

### 2.0 — 2026-09-14

Version 2.0 is a full rebuild, and the app is now NDT Nation.

• 60 verified calculators across RT, UT/PAUT, MT, ET, PT, VT, welding and materials (up from 7)
• New reference library: API 510, API 570, API 653, API 571 damage mechanisms, WPS/PQR, PT and UT code guides, PMI, CUI/coating, electrode storage
• Three separate exam tracks — state card / radiation safety (200 questions), CWI (351), ASNT Level II (199)
• Acceptance criteria and API 1104 indication evaluation, with real reference radiographs tied to each anomaly
• Big-screen mode fixed: tap Big screen on Film Interpretation for a full-screen density readout that mirrors cleanly to a TV or monitor over AirPlay or HDMI
• Customizable home screen with pinned and most-used tools
• Accuracy pass against the licensed code books, with corrections applied

### 1.0 — 2026-09-12

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-02.*