Barricade calculator app has been updated to version 2.1 in the App Store.
It’s product page with app store link may be found in the following link;
This version adds the ability to add shielding in addition to the collimator. This can be added in inches rather than in the half-value layers. The default colimator is still added in half-value layers.
Other improvements include faster performance and retina graphics for the iPhone.