We use RayXpert for calculation of the shielding of a transport container for our 60Co sources. We plan to use it in the future for other similar projects. It is in principle easy to use tool after few training sessions with TRAD. RayXpert imports CAD files of the objects for simulation of 3D dose distribution. We can also add multiple detectors at the desired locations around the object for more precise dose calculation, including indication of the precision. RayXpert has also a nice feature to continue simulations from the previously saved data, which helps to improve the accuracy of the results.