A dosimetric comparison of Xoft Axxent Electronic Brachytherapy™ and Ir-192 HDR brachytherapy in the treatment of endometrial cancer

详细信息    查看全文

• 作者：Adam Dickler ; Michael C. Kirk ; Alan Coon ; Damian Bernard ; Jacob Rotmensch ; Thomas W. Zusag
• 关键词：ATR-IR spectroscopy ; Hydrogenation ; Nitrite ; Pd/Al₂O₃ ; Liquid phase ; Water ; Mechanism
• 刊名：Brachytherapy
• 出版年：2008
• 出版时间：April-June 2008
• 年：2008
• 卷：7
• 期：2
• 页码：154
• 全文大小：45 K

文摘

The mechanism of nitrite hydrogenation over a Pd/Al₂O₃ catalyst layer deposited on a ZnSe internal reflection element was investigated in water using attenuated total reflection infrared spectroscopy. Nitrite hydrogenates to NO_(ads), NH_2(ads), and NH⁺₄ on the palladium surface. Hydrogenation of adsorbed NO on palladium results in the formation of a reaction product that is not infrared-active (most likely nitrogen), whereas no NH⁺₄ is formed from NO_(ads). NH⁺₄ is formed solely from hydrogenation of the NH_2(ads) intermediate. The present study clearly shows that formation of nitrogen and NH⁺₄ proceeds via two separate pathways, based on which a revised reaction scheme is proposed.