RSSP (Radon Scale Software Package) is an interactive support system that simulates the radon concentration inside ancient Egyptian tombs and the consequences on the population in terms of internal and external exposure. RSSP consists of three interconnected modules: the first one simulates the radon concentration inside ancient Egyptian tombs using a developed mathematical model. This model introduces the possibility of controlling the rate of radon accumulation via additional artificial ventilation systems. The source of inputs is an editable database for the tombs includes the geometrical dimensions and some environmental parameters like temperature and outdoor radon concentration at the tombs locations. The second module simulates the absorbed dose due to internal exposure of radon and its progeny. The third module simulates the absorbed dose due to external exposure of Gamma rays emitted from the tomb wall rocks. RSSP introduces the facility of following the progress of radon concentration as well as Internal and external absorbed dose in a wide range of time (seconds, minutes, hours and days) via numerical data and the corresponding graphical interface.