# DarkRoom RT — Gamma radiography calculator

> Gamma radiography calculator (iPhone/iPad app by Tomas Ramirez.)

- Source: https://appshunter.io/ios/app/darkroom-rt/id6825145339 (this page in markdown: same URL + `.md`)
- Developer: [Tomas Ramirez](https://appshunter.io/developer/1894095882)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English
- Released: 2026-10-25
- Data updated: 2026-10-25

## What is DarkRoom RT?

DarkRoom is a field toolkit for gamma radiographic testing (RT) technicians shooting Ir-192 and Co-60.

EXPOSURE
• Shot time from the field formula with your own R factor per isotope
• Pick a pipe and shot technique and thickness and SFD fill themselves in
• Boundary distances at 2, 5 and 100 mR/hr, plus your own rates
• "Show your work" breakdown for every result

SHOT TIMER
• Countdown on every tab, Live Activity on the Lock Screen and Dynamic Island
• Saved shots you can start with one tap
• Apple Watch: countdown, saved shots, and a strong end-of-shot haptic

CALCULATORS
Geometric unsharpness, minimum SFD, inverse square law, belt spacing, equivalent thickness, exclusion zone and IQI selection.

PIPE CHART
Every size and schedule, favorites synced through iCloud, film-based belt spacing, one tap to Exposure.

CODES & FIELD TOOLS
Plain-language limits and acceptance checkers for API 1104 (22nd Ed.), ASME B31.3, ASME Section V and AWS D1.1:2025.

TRY IT FREE
Every tool is free for 7 days. After that, unlock DarkRoom with a one-time purchase. No subscription, no account, no data collected.

DarkRoom is a calculation aid for qualified RT personnel. It does not replace your training, your written procedure, or a survey meter. Confirm every boundary with a calibrated survey meter.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 7-day Trial | Free | one-time |
| Full Unlock | $14.99 | one-time |


## Is DarkRoom RT safe?

Not enough ratings yet to assess DarkRoom RT.

## Is DarkRoom RT legit?

DarkRoom RT has limited verification signals. The AppsHunter Legitimacy Score for DarkRoom RT is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-25

No release notes.

## More apps by Tomas Ramirez

- [UTCal: Ultrasonic NDT & PAUT](https://appshunter.io/ios/app/utcal-ultrasonic-ndt-and-paut/id6762418371)
- [FormulaPulse](https://appshunter.io/ios/app/formulapulse/id6762660256)

All apps by Tomas Ramirez: https://appshunter.io/developer/1894095882

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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 2026-10-25.*