压弯聚焦镜自重的平衡

介绍了北京同步辐射装置中能X射线光束线(BSRF．383)中的压弯聚焦镜；在分析重力带来的面形误差的基础上，给出了重力平衡的方法；建立了修正前和修正后的柱面镜面形误差的数学模型，并通过优化计算，找出了最佳平衡力的作用点和大小。实施重力平衡后，压弯泵系统自重引起的面形误差可以大大减小。     

单细胞凝胶电泳法检测研究同步辐射软X射线辐照引起的DNA损伤

本实验采用单细胞凝胶电泳方法定量检测了不同辐照剂量的同步辐射软X射线对小麦根尖细胞造成的DNA单链损伤.通过测定核DNA的迁移效应表明,在剂量为0-288 J·cm-2范围内的软X射线辐照下,有20%-92%的小麦根尖细胞产生了DNA单链的损伤效应,同时DNA的损伤程度也与辐照剂量呈显著正相关.     

基于HSI颜色空间的X射线彩色图像分割

给出一种HSI颜色空间上基于HSI分量统计概率分布的彩色图像分割方法,并应用于X射线安全检查仪下危险品图像的分割。该方法将RGB彩色图像转换到HSI颜色空间,并以S分量为主要依据对图像进行粗分割,获得旅客包裹图像,然后,利用H和1分量的联合阈值进行细节分割获得疑似危险品的图像。在实际应用中表明该方法快速简单,满足实时性要求,是一种高效的自动算法。     

Soft X-ray Imaging using a Neon Filled Plasma Focus X-ray Source

A 3 kJ Mather-type UNU/ICTP plasma focus device with neon filling is used, for the first time, as a soft X-ray source for imaging of thin biological samples including insects. A charge-coupled-device (CCD) based pinhole projection system, placed in a differentially pumped chamber, is used for radiography using neon soft X-rays. The image brightness, contrast and resolution have been optimized by varying soft X-ray yield, pinhole size, camera chamber length and X-ray filters. The system can simply be modified for table-top soft X-ray microscopy of thin biological samples.     

曲酸生产菌的同步辐射软X射线诱变选育和发酵动力学研究

选择能量在氧的K吸收边附近的同步辐射软X射线对米曲霉孢子的辐照致死效应进行了研究。通过筛选，获得一株曲酸高产突变株。500ml摇瓶10d的发酵表明，突变株的累积产酸量（27．79g／L）较原发菌株的（17．81g／L）提高约56％。同时，改变发酵液中不同氮源和碳源，对突变株的发酵条件进行了比较研究。实验结果表明，同步辐射软X射线是进行曲酸生产菌诱变选育的潜在诱变源。     

X-ray absorptiometry for non-destructive monitoring of the salt uptake in bone-in raw hams during salting

Salt uptake variability in dry-cured ham batches is a problem for the dry-cured ham industry because part of the hams have either an excess or a lack of salt and therefore are more prone to sensory defects. The aim of this study was to evaluate the feasibility of an X-ray inspector for a non-destructive, on line determination of the salt uptake in entire bone-in hams during the salting procedure. Moreover, its usefulness in combination with a modified salting procedure to reduce the salt content and within batch variability was evaluated in an industrial case study. Predictive models for salt content, accurate enough for classification purposes (RMSEV = 0.210−0.257%), were developed using only one X-ray energy (50 kV). The use of an X-ray inspector in combination with slight modifications of the process allowed the reduction of the average salt content a 13.75% and 26.67% and a within-batch standard deviation from 0.45% to 0.21% or 0.26% depending on the reduced target salt content.     

Effect of the glass melting condition on the processing of phosphate-based glass–ceramics with persistent luminescence properties

In this paper, we discuss the impact of the temperature and the duration of the melting on the persistent luminescence properties of phosphate glasses within the P₂O₅–Na₂O–CaO and P₂O₅–Na₂O–SrO systems prepared using a standard melting process in normal atmosphere by adding Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ microparticles in the glass batch before melting. Glasses with persistent luminescence properties can be successfully prepared if the melting conditions are carefully controlled.     

Angular distribution of K-shell X-rays produced by 29 keV electrons incident on Ag

The absolute intensities of the Kα and Kβ X-rays produced by 29 keV electrons incident on a thick Ag target at forward angles in the range 0° to 55° relative to incident electrons have been measured. When corrections are made for attenuation within the target material, the results indicate that the K-shell X-rays are emitted isotropically. The experimental K-shell X-ray and bremsstrahlung production probability densities are compared to the results simulated by the Monte Carlo program, PENELOPE, and are found to be in good agreement.     

一种新的气体电子倍增模式的研究

介绍了一种新的气体放大器件--GEM,制作了一个有效面积为100mm×100mm的GEM+MWPC的模型.用5.9 keV的X射线源测量它的气体倍增系数,并研究了不同气体比例(Ar/CO2)下GEM的放大的性能.GEM的放大倍数可达到94倍.     

3333l/mmX射线全镂空自支撑透射光栅的制备与测试

针对我国对高线密度X射线镂空透射光栅在空间环境探测和激光等离子体诊断方面的需求,将电子束光刻和X射线光刻技术相结合,制备出3333l/mmX射线全镂空透射光栅,栅线宽度接近150nm,周期300nm,栅线厚度为500nm,有效光栅面积达到60%。首先利用电子束光刻和微电镀技术在镂空聚酰亚胺薄膜底衬上制备X射线母光栅掩模,然后利用X射线光刻和微电镀技术实现了光栅图形的复制品,之后采用紫外光刻和微电镀技术制作加强筋结构,最后通过腐蚀体硅和等离子体刻蚀聚酰亚胺完成镂空透射光栅的制作。在国家同步辐射实验室光谱辐射和计量实验站上对此光栅在5～23nm波段进行了衍射效率标定。标定结果表明所制备的光栅栅线平滑,占空比合理,侧壁陡直,不同光栅之间一致性好,完全可以满足应用需求。