Primordial radionuclides such as 238U and 232Th are found in traces almost in every soil, rocks and water on earth. They usually
have a very long half-life and continuously decay into another radioactive element, hence forming a decay chain. Primordial
radionuclides like 238U, 232Th and 40K and their corresponding daughter elements are the main source of gamma radiations on
earth[1], and their presence in the soil could lead us to identify their origin as well as abundance of their daughter elements like
radon, thoron and their progenies.