The effect of various thermal treatments (electric oven, microwave) and γ-irradiation at three doses, (6,8 and 10 KGy) on the composition of volatile and nonvolatile of Fennel (Feniculum vulgare mill) essential oil and also their antioxidant properties were considered. The hydrodistilled oil (HD) of control and treated samples were subjected to gas chromatography—mass spectrometry (GC/MS) analysis...