The aim of this project was to develop a computerized algorithm that could be used to accurately assess the protection required (in terms of dose rates) in the design of Radiotherapy bunkers. This included primary, scattered photon beams and neutron scattered beams. There are commercial computerized models available (mainly Monte Carlo based), but they are expensive and smaller institutes do not have readily available access to these models. Most radiotherapy departments rely on various publications on the subject of bunker design such as [1–3], and use empirical formulae to estimate the protection required. The formulae tend to be incorporated in spreadsheet format but may become cumbersome, however they must be revisited each time for accuracy and modernization, as often the LINAC (Linear Accelerator) specification and the design criteria (dose constraint) change with time. Given the above, creating an automated model/solution to shielding design calculations for high energy radiation was the task. Python was chosen as the programming language of choice to investigate the above. The radiotherapy bunkers in St. Vincent’s Private Hospital were used as the primary design to check the accuracy or validity of the program. For the above, there were existing calculated and measured dose rates for the bunkers which facilitated comparisons of results. Once the accuracy was determined, other bunker designs were assessed. This model has been used on the St. Vincent’s Private Hospital Radiotherapy clinic as a ’back-up check’ of their existing calculations. It is hoped that one day it may be used as an aid to modifying existing bunkers, or indeed in the design of next generation bunkers.