# Gamma Calculator Pro

> Business

Canonical page: [https://chrome-stats.com/d/id867478383](https://chrome-stats.com/d/id867478383)

## Overview

- **ID:** `id867478383`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Gerrit kleyn Winkel
- **Category:** Business
- **Rating:** 3.60 / 5 (19 ratings)
- **Version:** 2.7.1
- **Last updated:** 2026-03-20
- **First published:** 2014-05-05
- **Size:** 2.92 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gamma-calculator-pro/id867478383)
- **Privacy policy:** [https://klwinkel.com/privacy-policy](https://klwinkel.com/privacy-policy)

## Description

Exposure time calculator (and much more!) for NDT technicians.
New: experimental materials !!!
New: Percentage Change calculator

Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources.
No more need to calculate the formula or use of the "old-school plastic calculator"
Simply fill in the thickness, activity(in Curies) and source-film-distance and you get the correct exposure time.

R factor for different densities and film types.

For materials: Iron(steel), Concrete, Tungsten, Lead, Aluminum, Titanium, Copper, Zinc, Brass, Inconel X, Zirconium and Uranium.

Features:

- Exposure Time calculator
- Geometric Unsharpness calculator
- Exposure Correction calculator
- Decay calculator
- Barricade calculator
- Pipe Schedule selector (single/double wall)
- Weld enforcement setting
- Iridium 192 Emissivity setting
- inch/mm setting

## Rankings

- #281,023 — Overall
- #13 — Business (Paid)

## Review summary

Gamma Calculator Pro is highly valued for on-the-go shot-time calculations and widespread use among industrial radiographers. Users praise its usefulness and reliability, but several issues recur: OS updates can render it unusable, data gaps for D3/R-factor standards (AFGA/AGFA), and precision/decimal problems in measurements. Additional annoyances include a UI quirk when editing curie amounts and a lack of Gadolinium support. Overall, it’s a trusted, valuable tool that needs OS-friendly updates and expanded data coverage to stay dependable.

### Pros

- Widely used and trusted by X-ray professionals; an essential tool in many shops.
- Excellent for shot-time calculations and on-the-go radiography work.
- Long-term reliability and value; considered worth the purchase.
- Described as an amazing tool for industrial radiography by users.
- Supports field workflows and daily radiography tasks.

### Cons

- iOS/OS updates (e.g., iOS 16) can break functionality and stop the app from working.
- Missing R-factor data for D3 variants (D3 AFGA, D3 AGFA) reduces coverage.
- Precision issues in measurements (SFD rounding and missing/incorrect decimal places).
- UI friction when editing the curie amount (cursor starts at the front, extra steps).
- Lack of Gadolinium support in the decay calculator.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id867478383)