Gamma Calculator Pro

Name: Gamma Calculator Pro
Price: 3.99 USD
Rating: 3.6 (19 reviews)
Author: Gerrit kleyn Winkel

By: Gerrit kleyn Winkel App

Business

Overview

Version:

2.7.1

Last updated: 2026-03-20

Features & Capabilities

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

User Growth & Download Statistics

App

By:

Gerrit kleyn Winkel

Rating:

3.60

(19)

Version:

2.7.1 Last updated: 2026-03-20

Version code:

883470866

Creation date:

2014-05-05

Compatible devices:

Size:

2.92MB

Price:

3.99

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-07-16

Compare stats and ranking:

Ranking

# 326,388 ▼ 2,772

Other rankings

#9 in Business (Paid) ▲ 2

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Gerrit kleyn Winkel

Apple Apps Store

https://apps.apple.com/us/app/gamma-calculator-pro/id867478383

User Reviews

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.

Recent reviews

Between this app and another calculator app (x-ray_timer) I would say my whole shop uses this app for anyone that owns an I-phone. What drives me crazy is when you initially want to change the curie amount and the line always starts in the front of the initial number. Just an extra step moving the line to select the initial number and change it. We use this app every week here in Kansas.

by Is*****, 2024-12-07

Can you please add the R factor for D3. Also could you please make it so that the SFD and other measurements that need to be precise don’t round up or down?