en Radiobiology Radiobiology تحقيق بديع Original Research <div style="text-align: justify;">Background: Eucalyptus&nbsp;oil often used for medicinal purposes.&nbsp;Aims:&nbsp;The&nbsp;Eucalyptus&nbsp;oil gastro protective impact investigated against gamma-rays-exposure-induced gastric ulceration in rats. Materials and &nbsp;Methods:&nbsp;Thirty-two rats were divided equally into 4groups; control,&nbsp;Eucalyptus&nbsp;oil (100mg/ kg), gamma-rays (7Gy) and&nbsp;Eucalyptus&nbsp;oil plus gamma-rays&nbsp;treated groups. The stomach histopathology samples were examined. The levels of malondialdehyde, reduced glutathione, superoxide dismutase, tumour necrosis factor-&alpha; and the interleukin-1&beta; were assessed. Results:&nbsp;The stomach histopathological examination revealed that pre-treatment with&nbsp;Eucalyptus&nbsp;oil enhanced regeneration of mucosal crypt cells. The results revealed a decreased level of stomach malondialdehyde, inflammatory markers, increased levels of stomach antioxidants markers in&nbsp;Eucalyptus&nbsp;oil plus gamma-rays&nbsp;treated group.&nbsp;Conclusion: Eucalyptus oil ameliorates gamma-rays-induced gastric ulceration that could attribute to its antioxidant, anti-apoptotic and radioprotective activities.</div> &nbsp; Eucalyptus oil, gastric ulceration, gamma-rays, rats, radioprotector. 21 27 http://ijrr.com/browse.php?a_code=A-10-2188-56&slc_lang=en&sid=1 S. Tawfik samosoliman@gmail.com 7900319475328460020702 7900319475328460020702 Yes Health Radiation Research Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority, P.O. Box: 29, Nasr City, Cairo, Egypt A. Elkady 7900319475328460020703 7900319475328460020703 No Health Radiation Research Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority, P.O. Box: 29, Nasr City, Cairo, Egypt S. Salama 7900319475328460020704 7900319475328460020704 No Radiation Biology Department, National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority, P.O. Box: 29, Nasr City, Cairo, Egypt