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  1. TESIGN / RADAR
  2. STORE CARD
  3. Gamma Calculator Pro
Gamma Calculator Pro icon

Gamma Calculator Pro

Gerrit kleyn Winkel

Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources.

★ 2.7 (3)Paid #69 KRLast observed chart rank per day over 14 days. Taller is better (#1 is tallest). Hollow bars mean no observation.2026-09-02 no data2026-09-03 no data2026-09-04 no data2026-09-05 no data2026-09-06 no data2026-09-07 no data2026-09-08 no data2026-09-09 no data2026-09-10 no data2026-09-11 no data2026-09-12 no data2026-09-13 no data2026-09-14 no data2026-09-15 #69best rank in the 14 days#69Last 14 days · paid chart rankhollow = no data

RANKS Off the charts now — last seen Paid KR #69

Screenshots and the icon are reduced copies of the developer’s assets; each opens the App Store page. Removal requests: hello@tesign.com.

AT A GLANCE

USAGE
￦6,600 · in-app purchases [unconfirmed] · iOS/iPadOS
GENRE
비즈니스
CURRENT VERSION
2.7.1 ·
DEVELOPER
Gerrit kleyn Winkel
APP STORE
View on the App Store ↗
CATEGORY
PRODUCTIVITY

A summary, not legal advice.

STORE DESCRIPTION

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

- Ba…

The opening of the App Store description as stored, at most 600 characters. Written by the developer; formatting is not rendered.

RATING · RATING COUNT TREND

  1. ★ 2.73

The last observation of each day. A sudden jump in the count can be rating inflation — read it next to the rank change.

TIMELINE

  1. Released on the App Store
  2. Current version released
  3. First observed on a chart by TESIGN

AI chooses the lists under the owner’s delegation. No human review is running in September 2026. Total stars, increases, cross-source signals, last updates and licences are shown as evidence. How ranks work →

If this app gets editorial text (why, build, who, start, caveat) it becomes an edited entry. Until then the page shows only Apple’s public store information and our observed numbers.

App Store is a service mark of Apple Inc. Apple and the Apple logo are trademarks of Apple Inc. · Chart and rating source: Apple (top 100 free/paid per country, observed twice a day)