226 Ra and 222 Rn are essentially soluble in water ,thus enter ground water by the dissolution of materials in water layers, removal of rock or soil surfaces and expulsion from minerals by radioactive decay (Sahin etal.,2013). 226Ra has along half-life of 1600 years and behaves as calcium, tracing the calcium path in the body partially deposited in the bone tissue.The alpha-particle emission of radium makes it a car cinogen, with the continual accumulation of 226 Ra in the bone tissue being a known cause of bone cancer (Porntepkasemsan and Srisuksawad,2008). 222 Rn a decay product of 226 Ra has a half-life of 3.82 days and is a tasteless radioactive gas, inert, colourless, and odourless . Therefore, human beings are exposed to 222 Rn in two ways, either through inhalation or ingestion (Khattak etal.,2011). When radon decays after being inhaled or ingested, it releases energy that can damage parts of
Living tissue, which may lead to the unnatural reproduction of a cell and an increased risk of getting cancer.