# Barricade

> Radiation calculation utility for industrial radiographers using Iridium or Cobalt sources. (iPhone/iPad app by Lance Henderson.)

- Source: https://appshunter.io/ios/app/barricade/id348247916 (this page in markdown: same URL + `.md`)
- Developer: [Lance Henderson](https://appshunter.io/developer/348247919)
- Category: Utilities
- Price: Free
- Rating: 4.30/5 from 3 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 1 MB
- Languages: American English
- Released: 2010-01-05
- Data updated: 2026-06-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/barricade/id348247916/reviews.md

## What is Barricade?

This is a utility for Industrial Radiographers using Iridium or Cobalt sources.

Ever get tired of using a clumsy slide rule to make radiation calculations?  Or, even worse, doing them by hand with a pencil and paper!

This app will help you verify calculations.

This app is very simple to operate.  You simply enter the curies, choose the source, and the shot time in minutes (if less than 60).  Hit the Calculate button and you are done.

The app makes four separate calculations for you.  I will explain these below;

1)  It calculates the the distance to the Barricade (dose of 2 mrem) without any shielding factored in.

2)  It calculates the distance to the barricade with a common 4 half-value layer collimator included.

3) It calculates the distance to the barricade in an emergency or worse case conditions (eg. source malfunction).

4) It tells you what the maximum allowable reading on the barricade is.  This is used when shooting for much less than and hour and the barricade is small enough that more than 2 mR/hr is observed.

## Key features

- Radiation calculation for Iridium/Cobalt sources
- Calculates barricade distance without shielding
- Calculates barricade distance with collimator
- Calculates emergency barricade distance
- Determines maximum allowable barricade reading

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/barricade/id348247916/reviews.md

### 3/5 — IR192 at 1' is still at 5200 mr/hr not 5900

*2015-06-18, version 2.1*

Just needs to be updated to 5900 mr/hr

### 5/5 — Great for radiation safety

*2011-02-09, version 2.0*

Thanks

### 5/5 — Get it

*2011-01-23, version 2.0*

Works great for when you need to know fast!

### 5/5 — Great app

*2010-12-14, version 2.0*

Works great

### 4/5 — Update

*2010-05-25, version 0*

Great app. I use a 5 HVL though!

### 4/5 — Update

*2010-03-27, version 0*

Great app but can be better if you can adjust HVL

### 5/5 — Barricade Rocks !!!!

*2010-02-19, version 0*

Simple and easy to use. A MUST HAVE for radiographers ...

### 5/5 — great app

*2010-01-26, version 0*

great app lance thank you

## Frequently asked questions about Barricade

### What is Barricade used for?

Barricade is a utility app designed for industrial radiographers. It helps them perform radiation calculations quickly and accurately, specifically for Iridium or Cobalt sources, eliminating manual methods.

### What types of calculations does Barricade perform?

Barricade performs four key calculations: barricade distance without shielding, barricade distance with a 4 half-value layer collimator, emergency barricade distance, and the maximum allowable reading on the barricade.

### How does Barricade simplify radiation calculations?

Instead of using a slide rule or manual calculations, Barricade allows users to simply enter the curies, choose the source, and input the shot time. The app then performs the complex calculations automatically.

### What sources does Barricade support?

Barricade specifically supports calculations for industrial radiographers using Iridium or Cobalt sources.

### Is Barricade available on Android devices?

Based on the provided data, Barricade is currently supported on iPhone and iPod devices. Android compatibility is not specified.

### How often is Barricade updated?

The latest version of Barricade is 2.3, and it was last updated on October 20, 2017. This indicates infrequent updates in recent years.

### What is the user rating for Barricade?

Barricade has a user rating of 4.3 stars based on 3 ratings. This suggests a generally positive reception from its user base.

### Does Barricade have ads?

No, Barricade does not contain advertisements. It is a free utility app without any ad interruptions.

## Version history (last 5 releases)

### 2.3 — 2017-10-20

This app has been updated by Apple to display the Apple Watch app icon.

Updated the Max Dose Rate to 0.1 digit precision.

### 2.2 — 2017-09-16

Updated for iOS11

### 2.1 — 2012-07-28

Added optional other shielding materials.
Performance and appearance improvements.
Updated for Retina display on iPhone.

### 2.0 — 2010-06-15

Added ability to change the number of half-value layers.

Added Selenium 75 to the Isotope selections.

### 1.0 — 2010-01-05

No release notes.

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## More apps by Lance Henderson

- [X-Ray Timer](https://appshunter.io/ios/app/x-ray-timer/id350390647)
- [Ug Calc](https://appshunter.io/ios/app/ug-calc/id436130906)
- [Density](https://appshunter.io/ios/app/density/id458423388)

All apps by Lance Henderson: https://appshunter.io/developer/348247919

## Related topics

[irradvise](https://appshunter.io/ios/topics/irradvise) · [lance henderson](https://appshunter.io/ios/topics/lance-henderson) · [barricade](https://appshunter.io/ios/topics/barricade)

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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 2026-06-03.*