# NDT Field Calc

> NDT Field Calc (iPhone/iPad app by Marcus Cook.)

- Source: https://appshunter.io/ios/app/ndt-field-calc/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 · 4 MB
- Languages: American English
- Released: 2026-09-12
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/ndt-field-calc/id6808320392/reviews.md

## What is NDT Field Calc?

NDT Field Calc is the radiographic testing toolkit built by RT people, for RT people. Where general NDT apps skim the surface, this one goes deep on the film and radiation math you actually use in the field — and every calculation is built from ASNT and NCRP physics, not copied from a spec sheet.

SEVEN TOOLS, VERIFIED PHYSICS
• Film Interpretation — density accept/reject by code, the tool most apps leave out
• R-Factors — quick reference table for technique selection
• Source Decay — current activity for Ir-192, Co-60, Se-75, Cs-137, Yb-169 and Tm-170, with real half-lives and gamma constants
• Exposure Correction — recalculate time across distance and source-activity changes
• Geometric Unsharpness — Ug from source size, thickness and distance
• Safe Distance — barrier/boundary distance from activity and dose rate (always confirm with a survey meter)
• Pipe Schedule — wall thickness lookup to ASME B36.10M

BUILT FOR THE FIELD
• Works offline — no signal required at the shot location
• Fast, mobile-first, dark interface that reads in bright sun or a dark bay
• Made by a working radiographer, not a software shop

Whether you shoot pipeline, structural or plant work, NDT Field Calc puts the numbers you trust one tap away.

Radiation safety note: Safe Distance and exposure outputs are planning aids. Always verify with a calibrated survey meter and follow your radiation safety program.


## Version history (last 1 release)

### 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 2026-09-14.*