The book included study of the disturbances caused as a result of the gamma irradiation. The new researches directed to search in the nature for new natural products rich in antioxidants polyphenolic compounds. The willow leaves were selected to be under study. The book included studying protective effect of the aqueous extract of Willow leaves with all the active ingredients against the biochemical and the molecular disturbances occurred due to the exposure to gamma rays. The study followed the genetic abnormalities transmitted from the irradiated parents to the next generations and studying the antagonistic effect of willow extract against inheritance of these genetic disturbances in rats.