**5. Prediction techniques**

There are a few traditional approaches for predicting radon flux such as uninterrupted short-term monitoring to represent radon concentration over an extended period and laboratory investigations. These methods do not apply to all cases. Recently, Kayode et al. [11] developed an approach for predicting radon flux from fractured rocks, a discrete fracture network (DFN) model that can predict radon transport through fractures considering diffusion, advection, and radon generation with radon decay.
