最新刊期
      卷 0 ， 期 0 ， 2020
      • GAO Hongyi1,2 CHEN Jianwen1,2 ZHU Huafeng1 LI Ruxin1 XU Zhizh 1
        Issue 1, (2005)
        摘要：A layout of the photoelectron amplified X-ray holographic imaging system at synchrotron radiation facility is presented in this paper. By using a photocathode and electromagnetic lenses placed at the X-ray interference area, the hologram is transferred into electron hologram and amplified by the electromagnetic lenses afterward. It reduced the resolution requirement for the recording medium greatly. The hologram is capable of being recorded by CCD and then the images can be reconstructed on real time. This technology can also be used in X-ray phase contrast imaging. It will be a promising means to detect super-short dynamic process at nanosecond level if the photoelectron is derived from super short X-ray pulses in synchrotron radiation.  
        关键词：Synchrotron radiation;Photocathode;Holographic microscopy;Digital reconstruction   
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        发布时间：2021-03-12
      • SUN Baogen XU Hongliang CAO Yong LU Ping LI Jingyi WANG Junhua LI Weimin LIU Gongfa LI Jihao ZHENG Pu
        Issue 1, (2005)
        摘要：The operation principle of the beam-based alignment (BBA) and the BBA system for Hefei Light Source (HLS) is presented. The measured results of beam-based magnetic center of quadrupoles are given. Then, the global orbit is corrected using the beam-based magnetic center of quadrupoles as a reference orbit. After the global orbit is corrected, the COD will be controlled within ±0.1 mm.  
        关键词：Beam-based alignment;Beam position;Quadrupole shunt;Magnetic center;RF correction;Global orbit correction   
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        发布时间：2021-03-12
      • WANG Hongtao1,3 DAI Jianping2 CHEN Yongzhong1 ZHAO Zhentang1 1
        Issue 1, (2005)
        摘要：BPM system is essential for the operation of SASE FEL facilities. Among various types of BPMs, such as the button-type BPM or the stripline-type BPM, only the cavity BPM has the potential to achieve a higher beam position resolution. The amplitude of the TM110-mode excited by an off-center beam in the BPM cavity yields a signal proportional to the beam displacement and to the bunch charge; and the signal phase gives the direction of the displacement. This paper discusses the fundamental characteristics of cavity BPM, and reports our MAFIA simulations and RF measurement of an BPM cavity.  
        关键词：Cavity beam position monitor (Cavity -BPM);Free electron lasers;Resolution   
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        发布时间：2021-03-12
      • ZHENG Lifang LI Jitang LIU Songqiang
        Issue 1, (2005)
        摘要：This paper describes the experimental platform used for the digital feedback control in accelerators. It can be applied not only for studying the orbit feedback control, but also for studying the digital feedback control of high-precision power supplies and the low level control of RF system.  
        关键词：Digital control;Orbit feedback;PID control   
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        发布时间：2021-03-12
      • FAN Zhen1 XIE Yaning1 ZHANG Ke2 ZHANG Jing1 HU Tiandou1 1
        Issue 1, (2005)
        摘要：The Laue detector is a new type of fluorescence XAFS detector, which has advantages of good energy resolution, high counting rate and big acceptance area. In this paper, both theory and design of the Laue detector are discussed, and the results of a test for a low concentration sample are also given.  
        关键词：Synchrotron Rdiation;Fluorescence;XAFS;Detector;Laue   
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        发布时间：2021-03-12
      • QI Zeming1 SHI Chaoshu1,2 LIU Miao2 LIU Bo2 LIU Tao3 XIE Yaning3 1
        Issue 1, (2005)
        摘要：Valences of rare earth ions in long afterglow silicate phosphors were studies by L3 edge X-ray absorption near edge structure ( XANES ) spectroscopy. The results show that Eu ions are in divalent and trivalent mixed-valent state while Dy ions exist in trivalent state. No monovalent Eu and tetravalent Dy were observed. Validation of the ex- isting hole-transferring mechanism of long afterglow phosphors was discussed.  
        关键词：Long afterglow;XANES;Valence   
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        发布时间：2021-03-12
      • YANG Hailiang1 QIU Aici1 HE Xiaoping1 SUN Jianfeng1 TANG Junping1 WANG Haiyang1 LI Hongyu2 HUANG Jianjun1 REN Shuqing1 YANG Li1 1
        Issue 1, (2005)
        摘要：Preliminary research results for thermal-mechanical effects of the materials irradiated by high power pulsed ion beams (HPIBs) applied to simulate 1 keV black radiation X-rays are reported. The energy deposition profiles in Al samples for 1 keV black radiation and HPIB from FLASH II accelerator were calculated. Their energy deposition range and variation trend of the profile were essentially similar. The experimental results for the samples irradiated by HPIB from FLASH II accelerator are also presented. After the HPIB irradiation, the chrome plated on the metal surface was stripped by HPIB; the evaporating and melting traces on the surface of Al and Cu samples were visible; the sample’s mass loss was about 30—100 mg; the graphite samples were shattered and the deformation of thin Al samples was about 6 mm. The stress wave of LY12 Al samples irradiated by HPIB was also measured, which attained 35 MPa. It is suggested that HPIB can be used for simulating thermal-mechanical effects of materials irradiated by 1 keV black radiation X rays.  
        关键词：High power ion beams;Thermal-mechanical effects;Energy deposition;Black radiation;Irradiation;Stress wave;Thermal shock wave   
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        发布时间：2021-03-12
      • TANG Zhangxiong1 LIU Zhifang1 SHI Jinguo1 SUN Guoqing1 WEI Zengquan2 LI Wenjian2 XIE Hongmei2 1
        Issue 1, (2005)
        摘要：Dry seeds of three varieties of wheat were irradiated by 3.2—75 MeV/u 16O and 12C heavy ions with various doses. The mutagenic effects in M1 and M2 were studied. The results showed that the biological damage became higher with the increasing of the dose. For the energy of 8 MeV/u, the biological damage was higher than that for high energy (75 MeV/u). There was chlorophyll stripped deficiency in M1 generation for 8 MeV/u treatment, which was seldom found in γ -ray and high energy (75 MeV/u) heavy ions treatment and had not been reported. Wider mutational spectrum and higher useful mutation frequencies (earlier earing, dwarf stem, spike form) were observed in M2 generation by heavy ions treatment than in that by γ -ray treatment.  
        关键词：Heavy ions;Wheat;Chlorophyll stripped deficiency;Mutagenic effect   
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        发布时间：2021-03-12
      • JIANG Bingyao1 JIANG Jun1 FENG Tao1 REN Congxin1 ZHANG Zhengxuan1 LIU Xianghuai1 ZHENG Liping2 1
        Issue 1, (2005)
        摘要：Low energy ion beam assisted deposition (IBAD) was employed to prepare Ag films on Mo/Si(100) substrate. It was found that Ag films deposited by the sputtering method were with (111) preferred orientation. Ag films exhibited mixed (111) and (100) orientations if the growing films were bombarded by 500 eV Ar+ beam along normal direction with Ion/Atom arrival ratio of 0.18. Ag films exhibited highly preferred (111) orientation at incidence angle of 54.7o.  
        关键词：Ion beam assisted deposition;Ag film;Channeling effect;Preferred orientation   
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        发布时间：2021-03-12
      • WANG Min1 ZHU Zhiyuan1 YANG Ruiyuan1 WANG Wenfeng1 BIAN Shaowei1 SHEN Zhongqun1 GU Jianzhong2 WU Minghong2 1
        Issue 1, (2005)
        摘要：Dyeing and finishing industry is the largest wastewater producer in China. In this paper, electron beam irradiation induced decoloration and degradation of two reactive dyes have been presented. Changes of absorption spectra, pH value and the degrees of decoloration and COD removal are described. The synergetic effect of hydrogen peroxide and radiation technology is presented. It suggests that the combination of radiation technology and other wastewater treatment can be a promising process for treating dyeing and finishing waste effluents.  
        关键词：Electron beam irradiation;Reactive dye;Degradation;Decoloration;Hydrogen peroxide   
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        365
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        发布时间：2021-03-12
      • GAO Kejia1 SHEN Jiangfan2 ZHANG Naikang2 TAO Rong2 WANG Jianhua1 YE Zhiwei1 ZHAO Linmei1 ZHANG Guangzheng2 MA Jixiao3 1
        Issue 1, (2005)
        摘要：Aim of this work is to evaluate the diagnostic and prospective value of 131I-hTgMcAb for the differential, low differential and other type of thyroid cancer which do not uptake 131I. New Zealand rabbits were IV with asepsis and pyrogen-free 131I-hTgMcAb (18.5 mBq/kg) in order to study the stability, safety and metabolism in vivo. 26 cases of thyroid cancer with metastasis were IV 131 I-hTgMcAb. Multiple-phase SPECT imaging was done and the radioactive ratios of T/N were determined. We compared the 131I imaging, X-ray photos, 99mTc -MIBI imaging before and after 4 month therapy to evaluate the therapy effect. The liver and kidney function was followed up. The animal experiment showed that the cardiac chambers and great blood vessels could be imaged in 6 h, the liver was faintly visualized, while thyroid and stomach were not displayed. 26 cases showed 131I-hTgMcAb accumulated in the metastasis lesions which were identified by X-ray films or CT studies. The peak uptake time is about 72 h, the T/N ratio is over 4. After 4 months follow-up, the lesions of 5 cases became smaller, no changes in 17 cases. It is concluded that the stability of131I-hTgMcAb is good, no obvious side effects are found, so 131I-hTgMcAb is helpful to localize and treat the thyroid cancer.  
        关键词：I-hTgMcAb;Thyroid neoplasms;Imaging;Radiotheraphy   
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        发布时间：2021-03-12
      • DENG Jinglan CHENG Shiwu HOU Yingping LIN Guocheng WANG Jing
        Issue 1, (2005)
        摘要：The special features of old patients suffering from hyperthyroidism are atypical. With light symptoms and light signs, it’s called apathetic hyperthyroidism. Usually cardiovascular abnormality and concomitant atrial fibrillation are initial symptoms. Therefore, both early diagnosis and therapy in time are important. This paper reports the clinical data and the 131I therapeutic results for 30 hyperthyroidism patients aged over 60 years and 30 patients aged 20—53 as control group, who were followed-up for 2—25 years.  
        关键词：Hyperthyroidism;Old patient;131I therapy   
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        发布时间：2021-03-12
      • QIAN Jun1 ZHU Jianhua1 LI Duan2 HU Huan1 1
        Issue 1, (2005)
        摘要：Purpose of this work is to establish the analytic method and investigate the pharmacokinetics of 125I-rhTPO in rats receiving single injection of vein. 125I-rhTPO was prepared with Iodogen method. The radiochemical purity of 125I-rhTPO was determined both by HPLC and SDS- PAGE. In the test, 125I-rhTPO was injected via caudal vein at the dose of 2 μg·kg-1 in rats. Blood samples were collected at different time after i.v., then the drug concentration was determined according to the radioactivity and the pharmacokinetic parameters were calculated. It is shown that radiochemical purity of 125I-rhTPO was above 98%, and the pharmacokinetics of 125I-rhTPO following i.v. with 2 μg·kg-1 in rats was fit to two-compartment model. The T1/2( was (1.32±0.35) h, T1/2 α) ( ) β was (24.55±1.07) h and AUC0 →t was (134.26±22.99) ng·h·mL-1. 125I-rhTPO prepared with Iodogen method was accordant with original rhTPO at purity and molecular weight by SDS PAGE test. The stability of 125I-rhTPO was good in vitro. Half -lives were about 25 h.  
        关键词：I-rhTPO;Iodogen;Drug concentration   
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        发布时间：2021-03-12
      • ZHONG Zhengkun SUN Ying CHEN Yinliang
        Issue 1, (2005)
        摘要：Some of the research work on hydrogen-water isotopic exchange reaction was briefly reviewed and its applications to a series of hydrogen isotope separation processes, such as wastewater detritiation, heavy water production, and heavy water detritiation and upgrading etc, were discussed in detail. Perspective focused on the development of hydrogen-water isotopic exchange process was presented.  
        关键词：Hydrogen-water isotopic exchange;Heavy water production;Water waste detritiation;Hydrogen isotope separation   
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        发布时间：2021-03-12
      • XU Maolin1 YU Jianhua2 WANG Yuanmei1 1
        Issue 1, (2005)
        摘要：A principle of the line-scan Compton backscatter imaging based on the scattered photon energy spectra is presented. This imaging equation is concluded as a large-scale system of nonlinear equations. In view of the neural network with multi-criteria optimization, a solution of image reconstruction is worked out accordingly. Results of data simulations illustrate the fact that it is feasible to adopt the method of constructing neural network for the sake of multi-criteria Compton backscatter imaging, which is applicable to solving the ill-posed reconstruction problems.  
        关键词：Compton backscatter imaging;Neural network;Multicriteria optimization   
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        发布时间：2021-03-12
      • LIU Ping RUAN Yuquan PU Shijie
        Issue 1, (2005)
        摘要：The multi-channel pulse amplitude analyzer has been widely used in the nuclear spectrum measurement. The traditional operation environment was mainly based on the DOS. This paper presents an MS Windows based operation environment with a friendly user interface, by which we have tackled the problem of data acquiring in the interrupt mode.  
        关键词：Multi-channel pulse amplitude analyzer;Virtual device driver;Program design;Dynamic link library   
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        发布时间：2021-03-12
      • MA Guoli1 LI Yujie2 TIAN Yuhong1 BI Zhaohui1 1
        Issue 1, (2005)
        摘要：Based on the principle of AXIL which was extensively used in the world, a new X-ray spectrum analysis software has been developed by our lab. In comparison with old AXIL, this software works on the platform of Windows operation system and features flexibility as well as convenience. Over past four years a lot of spectrum data acquired by our TXRF spectrometer were analyzed by this software. The desired analysis results manifest that the new software is very reliable because of its high accuracy. It can completely replace the AXIL which works on the platform of DOS operation system.  
        关键词：Analysis software;AXIL;X-ray fluorescence analysis   
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        发布时间：2021-03-12
      • GUO Hongsheng FU Lan CHEN Yuanjin HE Xijun PENG Taiping
        Issue 1, (2005)
        摘要：Through producing ideal function and setting up various kinds of fluctuation errors, we numerally simulate effects of statistical fluctuation on the measurement of low and negative neutron breeding coefficients, and we also simulate effects of scintillator, cable and recording system.  
        关键词：Numeric simulation;Statistical fluctuation;Neutron breeding coefficient   
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        发布时间：2021-03-12
      • CHEN Yixue WU Yican HUANG Qunying
        Issue 1, (2005)
        摘要：The environmental dose rate distribution of the fusion device HT-7U during operation was calculated and analyzed by using the three-dimensional Monte Carlo transport code MCNP/4C and the latest Fusion Evaluated Nuclear Data Library FENDL/2. The influence of filling materials of the double-wall vacuum vessel on the environmental dose rate was investigated. The results demonstrate that the borated water filled in the vacuum vessel significantly reduces the environmental dose level. However the shielding effect of the enriched borated water is not evident as compared with the natural borated water. In addition, the radiation skyshine was investigated and it was found that the shadow effect was clearly shown in the environmental dose rate distribution for the thickness of the concrete ceiling less than 0.5 m.  
        关键词：Nuclear fusion;Tokamak;Dose rate;Monte Carlo method;Skyshine effect   
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        发布时间：2021-03-12
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