位置灵敏探测器漂移管的研制

自主研制了位置灵敏探测器漂移管,测量了其漂移时间性能,得到了漂移管的时间位置关系,与欧洲核子中心的监控漂移管性能基本一致,为漂移管国产化及批量生产奠定了理论及技术基础。     

两种位置灵敏平行板雪崩探测器

为兰州重离子加速器放射性次级束流线 (RIBLL)设计研制了两种结构双维位置灵敏低压气体平行板雪崩探测器 (PPAC)。用 3组分α粒子辐照 ,传统结构的PPAC ,对于 70 0Pa异丁烷和C3F8工作气体 ,分别得到 0 76mm(FWHM )和 0 64mm(FWHM)的位置分辨 ,探测效率为 99 1 %。新的多级位置灵敏平行板雪崩探测器 (MPPAC) ,对 65 0Pa异丁烷工作气体 ,测得 0 5 8mm (FWHM )的位置分辨、99 2 %探测效率和色散远好于± 0 2mm的位置线性。MPPAC增益较传统PPAC高 ,C3F8较异丁烷阻止本领强 ,适合探测较轻粒子。     

两级放大的气体位置灵敏探测器

介绍了近年来所出现的几种两级联合新型气体位置灵敏探测器。在很安全的电压下,不出现打火或电荷堆积就可以实现高计数率下的高增益。     

位置灵敏α探测器

本工作研制的位置灵敏α探测器由一个ＺｎＳ（Ａｇ）荧光屏，４根光纤束和４个光电倍增管组成，它是所研制的快中子飞行时间法检测隐藏爆炸物系统中的一个部件的简经试验模型，此位置灵敏α探测器的分辨率为１．５～１．７ｎｓ，位置分辨约３ｍｍ×３ｍｍ能耐４００℃的温度和长时期保持真空。     

用于束流剖面探测的位置灵敏探测器

介绍了用于剩余气体束流剖面探测系统的位置灵敏探测器的原理和结构。测试了探测器的性能，得到了位置分辨、位置线性、探测效率及探测器本底。     

宇宙射线μ子探测裂变核材料的模拟研究

平均能量为3~4 GeV的宇宙射线μ子在海平面的通量约为1/(cm2.min),这些μ子有很强的穿透力,能够穿透目前常用的防护层。μ子与物质作用主要发生小角度库伦散射,散射角与物质的原子序数有关。利用μ子穿过不同物质时所产生的散射角不同来辐射成像,研究μ子的累计通量条件下,辨别低、中、高Z三类物质的可行性。     

MCP位置灵敏探测器的数据获取系统

本文介绍用于ＭＣＰ位置灵敏探测器的数据获取和处理系统，简要描述了它的硬件结构和系统软件。本系统设计成为一个ＮＩＭ标准单宽仪器插件，采用ＩＢＭ－ＰＣ／ＡＴ微型计算机作为实验数据读出及数据处理。具有实用，可靠和性能价格比高等特点。     

一维位置灵敏电阻阳极低能量离子探测器

本文论述了微通道电阻阳极低能重离子探测器的原理，给出了已研制成功的位敏电阻阳极离子探测器的结构和信号分析电子学线路，用＾２３８Ｐｕα放射源测量了位敏探测器在有效面积范围内的位置信号，位置线性和位置分辨。位置分辨好于０．３ｍｍ，已满足了离子原碰撞的实验要求。     

一维电阻阳极位置灵敏探测器的研制

叙述了一维电阻阳极位置灵敏探测器的原理、构成以及相应的电子学获取系统，测量了探测器的各种特性和参数。     

Channeling effect in the dead layer of ion implanted,position-sensitive detectors in heavy-ion studies

Channeling in the dead layer and surface region of ion-implanted, position-sensitive detectors used in heavy-ion studies may lead to marked high energy tailing effects being recorded in the energy spectra. This results predominantly from the lower value for $\text{dE}\text{dx}$ in the dead layer with a small contribution from a reduction of the recombination component of the pulse height defect. Knowledge of the crystal orientation of the detector material and care in the associated alignment are demanded, especially when used in detection geometries having a large angular acceptance, where the particle angle of incidence varies considerably across the active length of the position-sensitive detector.     

Experimental validation of material discrimination ability of muon scattering tomography at the TUMUTY facility

Muon scattering tomography is believed to be a promising technique for cargo container inspection, owing to the ability of natural muons to penetrate into dense materials and the absence of artificial radiation. In this work, the material discrimination ability of muon scattering tomography is evaluated based on experiments at the Tsinghua University cosmic ray muon tomography facility,with four materials: flour(as drugs substitute), aluminum,steel, and lead. The features of the different materials could be discriminated with cluster analysis and classifiers based on support vector machine. The overall discrimination precisions for these four materials could reach 70, 95, and 99% with 1-, 5-, and 10-min-long measurement,respectively.     

Optimal processing of information from detectors used for detecting explosives by neutron-radiation analysis

The optimization is accomplished on the basis of methods used for checking statistical hypotheses. Two possible methods for processing information from γ-ray detectors are examined: setting a threshold according to a general likelihood ratio including all combinations of detectors or separate combinations of detectors. In the second case, all possible combinations of detectors must be sorted when the measurements are analyzed. Calculations for a specific setup with six detectors show that sorting detector combinations permits detection of smaller quantities of explosives than can be done with a general likelihood ratio. A sequential analysis instead of sorting detector combinations permits identifying explosives more quickly than can be done with a general likelihood ratio. __________ Translated from Atomnaya énergiya, Vol. 101, No. 5, pp. 379–387, November, 2006.     

两种在HIRFL-CSR中使用的光纤通信适配器

介绍了两种针对HIRFL-CSR控制特点,自主开发设计的光纤通信适配器.包括设计思路、工作原理、硬件组成及应用范围.如何利用这两种光纤适配器远程控制具备RS232或RS485接口的仪器设备.在工程中应用这两种适配器和光纤替代RS485总线解决了通信干扰问题,满足了工程控制要求.     

Two genetic types of postmagmatic thorium-rare-earth deposits

Two genetic types of postmagmatic thorium-rare-earth deposits have been distinguished. One is associated with surface ore channels, the other with plutonic bodies. The first type displays a close positional connection with the parental magmatic rocks, formed at shallow depths. These deposits have comptex successional phases and polymineral compositions; the vertical extension of mineralization is very small. Deposits of the second type do not have close positional connections with the magmatic rocks which were formed at considerable depths and at considerable distances from the ore channels. The mineral compositions of the ores are relatively simple. The vertical extension of mineralization is several hundred meters, the mineralization type displaying persistence with depth.Translated from Atomnaya Énergiya, Vol. 19, No. 3, pp. 277–281, September, 1965     

Improvement of machine learning-based vertex reconstruction for large liquid scintillator detectors with multiple types of PMTs

The precise vertex reconstruction for large liquid scintillator detectors is essential. A novel machine learning-based method was successfully developed to reconstruct an event vertex in JUNO. In this study, the performance of machine learning-based vertex reconstruction was further improved by optimizing the input images of neural networks. By separating the information of different types of PMTs and adding the information of the second hit of PMTs, the vertex resolution was improved by approxi...     

HPXe电离室和LaCl3(Ce)探测器在核材料鉴别中的应用

在核材料鉴别中，鉴于铀、钚材料中同位素种类多，发射的多条γ射线能量比较集中（主要都在0．1～2MeV之间）且分支比都比较小，生成的γ能谱复杂等特点，对于测量铀、钚材料的γ探测器要求具有高的能量分辨本领和探测灵敏度。常用于该种测量的是NaI闪烁探测器和HPGe探测器，而新的高压氙（HPxe）电离室探测器和LaCl3（Ce）探测器为核材料的鉴别提供了一种新的有效检测手段。     

两种大面积塑料闪烁探测器的性能对比及工艺设计

介绍了塑料闪烁探测器的基本组成和工作过程,针对两种不同尺寸、型号的大面积塑料闪烁探测器性能参数进行了对比.简单介绍了整体探测部件的工艺设计.     

Two types of MeV ion beam enhanced adhesion for Au films in SiO2

The ion beam-enhanced adhesion of thin Au films on vitreous silica sus studied for a wide range of Cl ion beam doses for beam energies between 6.5 MeV and 21.0 MeV. Since the residual adhesion of Au on SiO₂ is low, the improved adhesion can be easily seen using the Scotch Tape Test. The threshold in the enhanced adhesion corresponding to passing the tape test occurs at two different dose ranges for a given energy; one at very low dose centered around 1 × 10¹³ /cm², the other at higher doses with a threshold of around 1.5 × 10¹⁴ /cm² (depending upon the beam energy). At low doses (2 × 10¹² to 5 × 10¹³ /cm²) surface cracks occur on the SiO₂ substrates, these cracks close up at doses higher than 5 × 10¹³ /cm². A possible explanation of enhanced adhesion in the low dose range is associated with the surface crazing of the SiO₂ substrate. To make the adhesion test more quantitative, a scratch test was also used on the samples.