# RT Calculator: Gamma NDT — Radiography Exposure Tools

> Radiography Exposure Tools (iPhone/iPad app by 雪 蔺.)

- Source: https://appshunter.io/ios/app/rt-calculator-gamma-ndt/id6776261575 (this page in markdown: same URL + `.md`)
- Developer: [雪 蔺](https://appshunter.io/developer/1853712836)
- Category: Business, Utilities
- Price: $3.99
- Age rating: 4+
- Requires: iOS 16.0 · 3 MB
- Languages: French (France), German (Germany), American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan), Korean, European Spanish, Italian, Japanese, Dutch and 1 more
- Released: 2026-06-05
- Data updated: 2026-08-18
- User reviews in markdown: https://appshunter.io/ios/app/rt-calculator-gamma-ndt/id6776261575/reviews.md

## What is RT Calculator?

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.


## Version history (last 2 releases)

### 1.1 — 2026-06-19

Initial release with offline gamma exposure, decay, barricade, unsharpness, correction, favorites, history, formula reference, and safety disclaimer tools.

### 1.0 — 2026-06-05

No release notes.

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All apps by 雪 蔺: https://appshunter.io/developer/1853712836

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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 2026-08-18.*