The purpose of this bachelor thesis is to elaborate the contents for a smartphone application on the topic of radiation protection. The most important terms on the topics radiation, radioactivity, radiation protection and radiation injuries on the human body are elucidated in this paper. Additionally the Austrian rapid alert system for radiation and how it can be linked to the smartphone application is portrayed. Simplified short summaries of the most important technical terms are used as further content of the application. In the last chapter the topic, its chances and the potential of the project are critically discussed.