Energy Loss and Stopping Power of ^(4)He Ions in mylar Foils

The energy loss and stopping power of ^(4)He ions in mylar foils were determined in a transmission geometry.The experimental stopping power data were compared to the previous measurements at higher energies.At lower energies,no previous measurements exist.The present results were also compared to the commonly used semiempirically theoretical predictions by Ziegler and Manoyan,and significant deviations were observed.

Stopping Power of Au and Ag for He Ions

Energy loss of 0.45-5.0 MeV 4He ions in Au and Ag films were measured with the Rutherford backscattering method,and the stopping powers at lower energy range were extracted by comparing with that determined by Anderson et al.at higher energy range.Significant deviation between the experimental data and the semiempirical calculations by TRIM-90 appears around the stopping maximum.The accuracy of our results was expected to be±l%.

Measurements of the 2P_(3/2) Vacancy State Alignment of Au Induced by Proton, Lithium and Boron Ion Impact

In this paper,the degree of alignment of 2P_(3/2) vacancy state in Au induced by proton,lithium and boron ion impact was measured using a Si(Li)detector.Also the projectile-energy dependence of the degree of alignment was investigated over the projectile energy range from 0.2 MeV/amu to 2.0MeV/amu.The de-alignment phenomenon was observed for small relative impact velocities.

Stopping Powers of Bromine and Carbon in Silver

The stopping powers of Br and C in Ag Elm have been measured with the method of elastic recoil detection in energy range 0.28-0.42MeV/amu.The results have been compared with the theoretical calculations of TRIM-90.

Ni ION INDUCED X-RAY EMISSION

The thick targets of Ti,Fet Ni and Zn have been bombarded with 3 to 7Me V nickel ions.The X-ray spectra of the projectiles and targets showed a significant difference in the intensity of the X-ray radiation for several targets.The explanation of this phenomenon by quasimolecular orbital energy level correlation diagrams and the possible application of Ni ion induced X-ray emission were discussed.

Energy Straggling Measurements of ^(16)O and ^(19)F ions in Au and CaF_(2)

Energy stragglings of ^(16)O and ^(19)F were measured with heavy-substrate Rutherford backscattering technique.Great deviation was observed between present data and Bohr’s prediction.The accuracy of present experiment is about 10%.

Stopping Power of Compounds for ^(16)O and ^(19)F Ions

The stopping powers of CaF_(2) and MoO_(3) for ^(16)O and ^(19)F were measured with heavy-substrate Rutherford backscattering technique.The present results are compared with the prediction of Bragg's rule,and strong deviation was observed.The experimental error is 5%or so.

A NEW METHOD FOR PROFILING BORON BY NUCLEAR REACTION ANALYSIS

By studying the relative excitation curve of ^(11)B(p,0)^(8)Be,we found that there is a wide platform(~100keV)near the E_(p)=2.62MeV peak,which can be used to profile boron.A brief comparison between the new method and that of ^(11)B(p,α1)^(8)Be^(*) reaction has been given.

CARBON-ION RADIOACTIVITY OF ^(223)Ra

The carbon-ion radioactivity of ^(223)Ra has been measured with solid state track detectors.A branching ratio of the emission of ^(14)c nuclei to that of alpha-particles of(8.7±1.7)×10^(-10) is obtained.The preformation probability of ^(14)c in ^(223)Ra and the odd-even effect are discussed.

水平切开法在内眦赘皮合并下睑倒睫手术中的应用

目的 探讨应用内眦部水平切开法治疗先天性内眦赘皮合并下睑内翻倒睫的临床疗效。方法 对36例(72只眼)先天性内眦赘皮合并下睑内翻倒睫的患者进行内眦部皮肤水平切开松解,解除内眦部切线方向的牵引,同时行下睑内翻矫正,观察术后下睑倒睫矫正效果、内眦赘皮改善程度及切口瘢痕发生程度等指标。结果 36例患者72只眼术后倒睫及内眦赘皮均得到矫正,术后分别随访3、6、12个月,个别患者随诊至术后2年,倒睫矫正有效率为100%,并且内眦间距缩窄,美观度提升。结论 内眦水平切开法治疗先天性内眦赘皮合并下睑倒睫具有良好的临床效果,值得临床推广。