# Decay Lab — Radionuclide Decay Tool

> Radionuclide Decay Tool (iPhone/iPad app by Carlos Uribe.)

- Source: https://appshunter.io/ios/app/decay-lab/id6746874842 (this page in markdown: same URL + `.md`)
- Developer: [Carlos Uribe](https://appshunter.io/developer/1818871232)
- Category: Utilities, Medical
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English
- Released: 2025-07-10
- Data updated: 2026-09-02
- User reviews in markdown: https://appshunter.io/ios/app/decay-lab/id6746874842/reviews.md

## What is Decay Lab?

DecayLab makes radionuclide decay calculations quick and straightforward. Designed for nuclear medicine professionals, researchers, educators, and students, it provides a clean, focused workflow that works entirely offline.

Key features:
• Calculate radioactive decay for a wide range of radionuclides
• View activity at different reference and calculation times
• Apply decay corrections quickly and consistently
• Work with Bq, kBq, MBq, GBq, µCi, mCi, and Ci units
• Access built-in radionuclide half-life data
• Use all calculation features without an internet connection
  
DecayLab is useful for:
• Nuclear medicine technologists
• Medical physicists
• Radiation safety professionals
• Researchers and educators
• Students in nuclear medicine and related fields
  
Whether you’re checking an activity value, preparing calculations for a workflow, or studying radioactive decay, DecayLab keeps the process clear and efficient.

Important: DecayLab is a calculation and educational tool. Results should be independently verified before being used in clinical, diagnostic, therapeutic, or safety-critical decisions.


## Version history (last 5 releases)

### 2.0.6 — 2026-08-30

Radionuclides are now labelled by what they are used for.
• PET, SPECT, therapy and generator icons throughout, on the
  element list, the nuclide list, the energy states, and the
  calculator itself
• Elements used in nuclear medicine are grouped first, with
  everything else A to Z
• Expanded coverage of clinically used radionuclides, each
  labelled with the energy state actually used in the clinic
• Yttrium added to the common elements

Fixes
• Corrected the energy state selected by default. Several
  nuclides, including Pb-203, Tl-201, In-111, Y-90 and At-211,
  opened on a state that is not the clinical one, giving the
  wrong half-life. If you noted figures for these in an earlier
  version, please re-check them.
• The energy-state screen could open with its first row
  unresponsive

### 2.0.4 — 2026-08-16

Radionuclides are now labelled by what they are used for.
• PET, SPECT, therapy and generator icons throughout, on the
  element list, the nuclide list, the energy states, and the
  calculator itself
• Elements used in nuclear medicine are grouped first, with
  everything else A to Z
• Expanded coverage of clinically used radionuclides, each
  labelled with the energy state actually used in the clinic
• Yttrium added to the common elements

Fixes
• Corrected the energy state selected by default. Several
  nuclides, including Pb-203, Tl-201, In-111, Y-90 and At-211,
  opened on a state that is not the clinical one, giving the
  wrong half-life. If you noted figures for these in an earlier
  version, please re-check them.
• The energy-state screen could open with its first row
  unresponsive

### 2.0.3 — 2026-08-04

DecayLab has been rebuilt for iOS with a refreshed, native design.
• New "Activity Now" home-screen widget
• Faster, cleaner calculation workflow
• Independent “Now” controls for reference and calculation times
• Improved unit selection and keyboard behavior
• Updated app icon and colors
• Performance improvements and bug fixes

### 2.0.2 — 2026-08-03

DecayLab has been rebuilt for iOS with a refreshed, native design.
• New "Activity Now" home-screen widget
• Faster, cleaner calculation workflow
• Independent “Now” controls for reference and calculation times
• Improved unit selection and keyboard behavior
• Updated app icon and colors
• Performance improvements and bug fixes

### 2.0.1 — 2026-07-31

DecayLab has been rebuilt for iOS with a refreshed, native design.
• New "Activity Now" home-screen widget
• Faster, cleaner calculation workflow
• Independent “Now” controls for reference and calculation times
• Improved unit selection and keyboard behavior
• Updated app icon and colors
• Performance improvements and bug fixes

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## Related topics

[half life hero](https://appshunter.io/ios/topics/half-life-hero)

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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 2026-09-02.*