目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Do...目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Dose-Areas Product)等参数,测量用所得的个人剂量当量Hp(0.07)值估算不同程序治疗过程中不同术者的左眼,右眼以及两眼中间的眼晶状体剂量,并与治疗过程的记录值做统计学分析。结果统计计算介入职业人员眼晶状体剂量,五种介入程序-冠状动脉造影(CA,Coronary Angiography)、冠状动脉成形术+植入术(PTCA+PCI,Percutaneous Transluminal Coronary Angioplasty and Percutaneous Coronary Intervention)、脑动脉瘤、心脏起搏器、心脏射频消融,年平均当量剂量分别为15.12、11.59、8.64、36.10、12.78 m Sv。其中操作者在做起搏器治疗时眼晶状体受辐射剂量最高。结论职业人员在起搏器治疗时所受剂量超过国际放射防护委员会(ICRP)最新推荐的眼晶状体剂量限值(20 m Sv)。同时通过统计学分析得,不同的治疗类型、透视时间、累积剂量、DAP,职业人员的眼晶状体剂量也不同。因此,介入职业人员应尽量减少操作时间,加强对眼晶状体的防护。展开更多
Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic...Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic useful g-lactone and butenolide derivatives.展开更多
The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron mi...The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.展开更多
文摘目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Dose-Areas Product)等参数,测量用所得的个人剂量当量Hp(0.07)值估算不同程序治疗过程中不同术者的左眼,右眼以及两眼中间的眼晶状体剂量,并与治疗过程的记录值做统计学分析。结果统计计算介入职业人员眼晶状体剂量,五种介入程序-冠状动脉造影(CA,Coronary Angiography)、冠状动脉成形术+植入术(PTCA+PCI,Percutaneous Transluminal Coronary Angioplasty and Percutaneous Coronary Intervention)、脑动脉瘤、心脏起搏器、心脏射频消融,年平均当量剂量分别为15.12、11.59、8.64、36.10、12.78 m Sv。其中操作者在做起搏器治疗时眼晶状体受辐射剂量最高。结论职业人员在起搏器治疗时所受剂量超过国际放射防护委员会(ICRP)最新推荐的眼晶状体剂量限值(20 m Sv)。同时通过统计学分析得,不同的治疗类型、透视时间、累积剂量、DAP,职业人员的眼晶状体剂量也不同。因此,介入职业人员应尽量减少操作时间,加强对眼晶状体的防护。
基金We are grateful for the financial supports from the National Outstanding Youth Fund (No. 29925204) the Foundation for University Key Teacher by the Ministry of Education of China and a Visiting Fund of the National Laboratory of Applied Organic Chem
文摘Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic useful g-lactone and butenolide derivatives.
基金This work was supported by the National Natural Science Foundation of China.
文摘The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.
