# Gamma Calculator Pro

> Industrial radiography exposure calculator for various sources and materials. (iPhone/iPad app by Gerrit kleyn Winkel.)

- Source: https://appshunter.io/ios/app/gamma-calculator-pro/id867478383 (this page in markdown: same URL + `.md`)
- Developer: [Gerrit kleyn Winkel](https://appshunter.io/developer/797512757)
- Category: Business
- Price: $3.99
- Rating: 3.60/5 from 19 App Store ratings · 17 written reviews indexed
- Age rating: 17+
- Requires: iOS 18.6 · 3 MB
- Languages: American English
- Released: 2014-05-05
- Data updated: 2026-09-09
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gamma-calculator-pro/id867478383/reviews.md

## What is Gamma Calculator Pro?

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

## Key features

- Exposure Time Calculator
- Geometric Unsharpness Calculator
- Exposure Correction Calculator
- Decay Calculator
- Barricade Calculator
- Pipe Schedule Selector
- Material Density Calculations

## Chart rankings

- #85 in Top Paid · Business (US App Store)

## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/gamma-calculator-pro/id867478383/reviews.md

### 5/5 — A reliable app for I-phone

*2024-12-07*

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.

### 4/5 — Requested changes

*2024-02-22*

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?

### 4/5 — Works well

*2023-12-16*

The app works well on IPhone if you know what you’re doing and double checking it. There are a few mistakes with the schedule thicknesses in the calculator where some measurements are missing decimal places in front so the distance is over a hundred feet.

### 1/5 — Fix it!

*2022-09-26*

This thing worked like a dream for years but since the update…it’s junk. Won’t even configure time on iPhone! Fix it or refund my purchase.

### 1/5 — 아이폰 안되

*2022-09-26*

4.1 업데이트 후에 안되요
글씨 안보여

### 5/5 — App update

*2022-09-26*

Love the app, have been using it for years, but as of today the app will not work on my iPhone after the IOS 16 update. Please fix

### 4/5 — R-factor

*2022-08-18*

The R-factor for AFGA D3 isn’t listed. I would like to know if this will ever be added or fixed. I love the app, but this is the problem I have with it.

### 2/5 — 24” Schedule 40

*2022-04-10*

App is great for getting shot times. 
Now…24” 40s and 24” schedule 40 are 2 different thicknesses. 
24” 40S is a .375
24” Sch 40 is a .688
I learned the hard way to figure that one out.

### 5/5 — Love this app

*2019-04-15*

Use this everyday, best app for X-ray personnel.

I wish the maker of this app would do a code app like b31.3, section 8, api 1104.

### 2/5 — No D3 AGFA

*2019-03-26*

No D3 AGFA in R factor chart everything else is great though. If you could add it that would be awesome!

## Frequently asked questions about Gamma Calculator Pro

### What is Gamma Calculator Pro used for?

Gamma Calculator Pro is an exposure calculator designed for industrial radiography sources such as Iridium-192, Selenium-75, and Cobalt-60. It helps users determine correct exposure times by inputting parameters like thickness, activity, and source-film distance.

### What materials can Gamma Calculator Pro calculate exposure for?

The app supports exposure calculations for a variety of materials including Iron (steel), Concrete, Tungsten, Lead, Aluminum, Titanium, Copper, Zinc, Brass, Inconel X, Zirconium, and Uranium.

### Does Gamma Calculator Pro have ads?

No, Gamma Calculator Pro does not contain advertisements. It is a paid application with no ads to interrupt the user experience.

### What devices is Gamma Calculator Pro available on?

Gamma Calculator Pro is available on iPhone and iPad devices, offering its functionality to a wide range of iOS users.

### How often is Gamma Calculator Pro updated?

The latest version of Gamma Calculator Pro is 2.7.1, last updated on March 20, 2026. This indicates a recent update, suggesting ongoing support and development.

### What is the age rating for Gamma Calculator Pro?

Gamma Calculator Pro has an age rating of 17+, indicating it is intended for mature users due to the nature of its technical calculations and subject matter.

### What is the price of Gamma Calculator Pro?

Gamma Calculator Pro is available for a one-time purchase of $3.99. This price grants users access to all its features without further in-app purchases or subscriptions.

### What are the key features of Gamma Calculator Pro?

Key features include an Exposure Time calculator, Geometric Unsharpness calculator, Exposure Correction calculator, Decay calculator, Barricade calculator, and a Pipe Schedule selector.

## Version history (last 5 releases)

### 2.7.1 — 2026-03-20

Build for IOS 26
New Percentage Change calculator
New 5mR barricade
New 3exp barricade
New experimental materials:
+ Aluminum
+ Titanium
+ Copper
+ Zinc
+ Brass
+ Inconel X
+ Zirconium
+ Uranium

### 2.7.0 — 2026-03-11

Build for IOS 26
New 5mR barricade
New 3exp barricade
New experimental materials:
+ Aluminum
+ Titanium
+ Copper
+ Zinc
+ Brass
+ Inconel X
+ Zirconium
+ Uranium

### 2.6.2 — 2025-05-16

New 5mR barricade
New experimental materials:
+ Aluminum
+ Titanium
+ Copper
+ Zinc
+ Brass
+ Inconel X
+ Zirconium
+ Uranium

### 2.6.1 — 2024-05-06

New 5mR barricade
New experimental materials:
+ Aluminum
+ Titanium
+ Copper
+ Zinc
+ Brass
+ Inconel X
+ Zirconium
+ Uranium

### 2.6 — 2024-03-12

Exposure Correction Tool
New experimental materials:
+ Aluminum
+ Titanium
+ Copper
+ Zinc
+ Brass
+ Inconel X
+ Zirconium
+ Uranium

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All apps by Gerrit kleyn Winkel: https://appshunter.io/developer/797512757

## Related topics

[fujifilm exposure calculator](https://appshunter.io/ios/topics/fujifilm-exposure-calculator)

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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 2026-09-09.*