最新刊期
      卷 0 ， 期 0 ， 2020
      • YAO Jing CAO Chongzhen GAO Xueguan MA Peisun
        Issue 9, (2005)
        摘要：The principle of the T-shaped exit fixed mechanism of the exit beam and entrance one in the dou- ble-crystal monochromator is introduced, and requirements of deciding the ubiety and dimensions of two crystals are analyzed. According to these requirements, a method of deciding the ubiety and dimensions of two crystals based on the T-shaped exit fixed mechanism is put forward. The method can not only satisfy the working requirements of dou- ble-crystal monochromator, but also optimize the length of two crystals, moreover, it can eliminate the position error when fine adjusting the second crystal. The advantage of the method is testified by giving an example in the end.  
        关键词：Synchrotron radiation;Double-crystal monochromator;T-shaped exit fixed mechanism   
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        发布时间：2021-03-12
      • WANG Mingwei1,2 YIN Duanzhi WANG Yongxian LI Junling ZHAN Lan ZHOU Wei 1
        Issue 9, (2005)
        摘要：Radiolabelled amino acids have been the interesting field of radiopharmaceuticals for several years, of which O-(2-[18F]fluoroethyl)-L-tyrosine is very promising as PET imaging agent for tumor diagnosis. [18F]FET was synthesized via a two-step reaction consisting of [18F]fluorination of 1, 2-bis(tosyloxy)ethane for preparing the alkylating agent 2-[18F]fluoroethyltosylate and [18F]fluoroethylation of L-tyrosine for obtaining the objective [18F]FET. The synthesis was typically finished in less than 50 min with overall radiochemical yields of 20%—30% (without decay correction)and radiochemical purity more than 98%.  
        关键词：Amino acids;L-tyrosine;Fluoroalkylation;FET;PET;Brain tumor   
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        发布时间：2021-03-12
      • GUO Shilun1,3 DOKE T2 LI Li1 CHEN Baoliu1 ZHANG Donghai3 KIKUCHI J2 TERASAWA K2 KOMIYAMA M4 HARA K2 FUSE T2 YASUDA N5 MURAKAMI T5 1
        Issue 9, (2005)
        摘要：Studies on bubble detectors with high energy heavy ions, such as p, He, C, Si, Ar, Fe, Kr and Xe demonstrate that bubble detectors possess many behaviors similar to solid state nuclear track detectors, and have some advantages over the latter, such as the capability of active development, real-time recording and volume track visibility. One of the conclusions drawn from the studies is that bubble detector is a new category of solid state nuclear track detectors.  
        关键词：Bubble detectors;Solid state nuclear track detectors;High-energy heavy ion registration   
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        发布时间：2021-03-12
      • ZHANG Guiying NI Bangfa LI Li TIAN Weizhi WANG Pingsheng HUANG Donghui ZHANG Lanzhi LIU Cunxiong LIU Likun LI Dehong
        Issue 9, (2005)
        摘要：Neutron solid-state bubble detector is considered as a unique one to meet the needs of the personal neutron dosimeter recommended by International Committee of Radiation Protection, ICRP60, at present. It has the flat response of neutrons from low energy to high energy, and is insensitive to gamma rays. In this work, superheated liquid drops were dispersed into a soft polymer homogeneously. A personal neutron bubble dosimeter has been made, and the sensitivity reached to about 4 bubbles/μSv. The principle and the processing procedure of the bubble detector were also introduced in this paper.  
        关键词：Bubble detector;Personal neutron dosimeter;Superheated liquid drops   
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        发布时间：2021-03-12
      • JIN Yunfan1 YAO Cunfeng1 WANG Zhiguang1 XIE Erqing2 SONG Yin1 SUN Youmei1 ZHANG Chonghong1 LIU Jie1 DUAN Jinglai ZHAO Zhiming1 1
        Issue 9, (2005)
        摘要：The irradiation experiments of thin C60 film stacks were performed with 1.23 GeV 56Fe ions delivered by HIRFL at Lanzhou, China. The strong electronic excitation effects including the formation of latent tracks were analyzed by means of Raman scattering spectroscopy. The analysis results indicated that some components of high-pressure-high-temperature phase of the polymerized C60 appeared in the irradiated C60 films and finally amorphous transformation of C60 molecule took place. The damage cross-sections of the C60 molecule or cross-section of latent track of Fe ions in C60 films σ deduced from the Raman spectra data are between 1.1 and 4.5nm2 for the electronic energy losses from 3.5 to 8.7 keV/nm and the corresponding efficient radii of the latent tracks are between 1.0 and 2.1nm. The electronic energy transfer dominates the damage process of C60 films. The partial recovery of the damage in the irradiated C60 films at certain electronic energy losses is attributed to an annealing effect of strong electronic excitation.  
        关键词：Latent track;Strong electronic excitation effect;C60 films;Swift Fe ion;Raman spectroscopy   
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        发布时间：2021-03-12
      • XIE Hongmei1 WEI Zengquan1 MEI Mantong2 ZHUANG Chuxiong2 MA Qiufeng1 MAO Shuhong1 1
        Issue 9, (2005)
        摘要：To ascertain cause of mutation of rice seeds induced by space loading in spaceship “Shen-zhou Ⅲ, a “sandwich” experimental setup was designed. CR-39 solid-state nuclear track detectors were used to detect space heavy ions. Based on the position of track corresponding to seed in the setup, the seeds and their sites hit by ions were determined.  
        关键词：Space loading;Heavy ion;Rice seed;CR-39 solid state nuclear track detector;Hitting localization   
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        发布时间：2021-03-12
      • QIN Huaili XUE Jianming LAI Jiangnan ZHANG Weiming WANG Jianyong YAN Sha ZHAO Weijiang WANG Yugang
        Issue 9, (2005)
        摘要：Dry seeds of Arabidopsis thaliana were irradiated with F ions and H ions with the energy range from keV to MeV, respectively. The inhibition of germination was investigated to display the influences of ion mass, energy and fluence. The results show that H ion irradiation is more effective in decreasing the germination rate than heavier F ion irradiation. After irradiation of F ions, a decrease-increase-decease type of germination rate-fluence response curve was found and the ion fluence at the peak position decreases with ion energy increase. The possible mechanism of above experimental results is discussed in this paper.  
        关键词：Ion irradiation;Arabidopsis thaliana;Germination   
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        发布时间：2021-03-12
      • LAI Jiangnan1 XUE Jianming1 QIN Huaili1 CHEN Guohua2 WEI Xionghui2 WANG Yugang1
        Issue 9, (2005)
        摘要：The study on products of CT DNA irradiated with heavy ion is very important to understand the biologic effect induced by heavy ions. We have analyzed the products of CT DNA irradiated with MeV F ions using agarose gel electrophoresis, MALDI-TOF and HPLC methods. The results show that the products are mostly multi-DSB in our experiment observed by agarose gel electrophoresis, and there are not observable products between 1,000 and 30,000 (m/z) using MALDI-TOF method. HPLC result indicates some small biomolecules occurring in the products. These results suggest that the break of CT DNA induced by MeV heavy ions irradiation was not a random process.  
        关键词：MeV ion;Irradiation;DNA;Damage   
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        发布时间：2021-03-12
      • GAO Shaokai YUAN Wanming DONG Jinquan WANG Shicheng
        Issue 9, (2005)
        摘要：Through making a series of experiments on the etching of three different samples of tourmaline, we have probed the best etching conditions of this mineral. It is shown that when the sample is etched either with 40% HF at 35℃ for 30 min or with KOH at 40℃ for 20 min, fission tracks can be obviously seen on the plane of the mineral which is parallel to the c axis under optical microscope.  
        关键词：Tourmaline;Fission track;Etching condition   
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        发布时间：2021-03-12
      • DUAN Jinglai1,2 LIU Jie1 ZHU Zhiyong3 WANG Zhiguang1 SUN Youmei1 HOU Mingdong1 JIN Yunfan1 YAO Huijun1,2 SONG Yin1 ZHAO Zhiming1,2 YAO Cunfeng1,2 1
        Issue 9, (2005)
        摘要：Nuclear track membranes offer distinct advantages over conventional membranes due to their precisely determined structure. Their pore size, shape and density can be controlled intentionally so that a membrane with the required characteristics can be produced. The track etching technology plays a most important role in the production of nuclear track membranes. The effects of pretreatment using UV light illumination on track etching of polycarbonate (PC) track membranes were investigated in this work. PC films illuminated by UV light showed a strong enhancement in the track etching rate. Furthermore, the track etching rate had a linear increase with illumination time. The phenomenon is attributed to the oxygen-assisted photo-degradation through generating new photo-unstable species. In this paper, the conductance measurement is also presented, which is a popular method used in etching technology.  
        关键词：Nuclear track membranes;Polycarbonate;UV light illumination;Conductance measurement   
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        发布时间：2021-03-12
      • XIAO Detao ZHAO Guizhi XIAO Yongjun MA Guangnai
        Issue 9, (2005)
        摘要：An integrated thoron measurement method with absorber was developed based on the characteristic of thorium C’ which emits an α particle with higher energy than that of α particles released from radon and radon progenies. The principle of discriminating radon and realizing thoron measurement with absorber, a passive and integrated thoron monitor developed and its calibration method are introduced. The calibration coefficients of the monitor are R0=0.0767cm–2 (kBq·m–3·h) –1 for thoron exposure measurement and R=0.1300 cm–2(kBq·m–3·h) –1 for thoron exhalation rate measurement. The lower limits of detection are LLDC=248.4 Bq·m–3 and LLDE=34.8 mBq·m–2·s–1 when the sampling period is 7 days and the deviation of background track densities of the adopted CR-39 is ST=1.6 cm–2. The method was used for the measurement of environmental thoron concentrations, the distribution of indoor thoron and its progenies concentrations, and thoron exhalation rates on material surfaces.  
        关键词：Thoron;Thoron concentration;Exhalation rate;Absorber   
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        发布时间：2021-03-12
      • SHEN Yan ZHAO Yonggang GUO Shilun LI Jinghuai LIU Guorong LI Jing WANG Lingbo WANG Tongxing
        Issue 9, (2005)
        摘要：In the analysis of environment samples for nuclear diagnosis and nuclear safeguard technology, it is very important to analyze the elemental and isotopic compositions of uranium aerosol particles (usually very few and in μm-size). The combination of SEM (scanning electron microscope) and SIMS (secondary ion mass spectrometer) is one of the accepted working lines to analyze isotopic compositions of particles. But it required fast searching and accurate locating the interested particles on the sample planchet in SEM and then re-locating the particles and analyzing their isotopic composition in SIMS. This paper describes the method of making reference marks on 25mm diameter graphite planchet by using nuclear track membrane and presents the result of relocation of simulated particles from SEM to SEM. The study shows that the average deviation of relocation is 5.8±2.6μm with reference marks by using nuclear track membrane. The accuracy is not lower than that by using other patterns’ reference marks.  
        关键词：Nuclear track membrane;Uranium aerosol particle;Microscopic relocation   
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        发布时间：2021-03-12
      • LI Yiguo ZHU Qingfu XIA Pu GAO Yongchun ZHU Guosheng ZHENG Wuqin SHI Yongqian
        Issue 9, (2005)
        摘要：A thermal neutron beam equipment is installed in the miniature neutron source reactor (MNSR) zero power facility. The neutron flux densities at various positions in neutron beam equipment are measured by SSNTD method. When the neutron flux density at the equipment entrance is 5.39×107 cm–2·s–1, the thermal neutron flux density at the equipment exit is 5.63×104 cm–2·s–1, with an attenuation factor for thermal neutron flux density being 1/957, while the attenuation factors by using TLD and MCNP/4B methods are1/ 1032 and 1/972, respectively.  
        关键词：SSNTD;Neutron flux density;Neutron beam equipment   
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        发布时间：2021-03-12
      • KANG Xi XIAO Detao
        Issue 9, (2005)
        摘要：For the measurement of radon daughters using alpha spectrometers, it is important to know the difference of detection efficiencies between higher energy α particle and lower one. The detection efficiencies of the ORTEC eight-channel alpha spectrometer working station for higher energy α particle and lower one are measured by an 241Am alpha standard source and a radon progeny standard source made by Canada Pylon Company, and the difference between the two was analyzed. The results show that the gross spectrum efficiencies of the two sources are equal within the deviations, and after the correction of the peak overlap the detection efficiency of α particle with higher energy is a little higher than that of the one with lower energy. So using radon progeny standard source is better than using 241Am source, because using radon progeny standard source to calibrate a device is more suitable to the practical radon progeny measurement situation than using 241Am.  
        关键词：Radon progeny;α particle;Detection efficiency;α spectrum   
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        发布时间：2021-03-12
      • LI Yiguo1 ZHAO Xiuliang2 ZHU Qingfu1 CAO Jian1 XIA Pu1 SHI Yongqian1 LUO Zhanglin1 LUO Yisheng3 1
        Issue 9, (2005)
        摘要：The isotropic neutron response and energy resolution of the combined detector, which consists of polyethylene, lead and CR-39, are calculated. The calculated results show that both energy response and resolution of the detector are related to neutron energy and the thicknesses of both polyethylene and Pb. For a fixed thickness of polyethylene, the peak value of energy response and energy resolution turn to smaller with the increase of Pb thickness. For the fixed thickness of Pb, with the increase of thickness of polyethylene, the peak value and resolution turn to larger, the peak value position moves towards the high neutron energy and its shape also changes.  
        关键词：Isotropic neutron;Energy response;CR-39;Combined detector   
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        发布时间：2021-03-12
      • YUAN Wanming1 DONG Jinquan1 WANG Shicheng1 YANG Zhiqiang2 1
        Issue 9, (2005)
        摘要：The apatite fission track analyses have been performed for total 4 samples collected from upper Permian System sandstone in South-Block of eastern Kunlun Mountains. The ages range from (48±3) Ma to (89±8) Ma, in accord with regional thrusting time, and the confined track lengths are from (10.7±2.3) μm to (10.8±2.2) μm with a single peak value, showing that the samples kept a long time at the annealing zone of apatite fission track and then uplifted rapidly. Three tectonic phases have been revealed in the whole. A comparative cooling occurred from ~107 Ma to ~80 Ma first, following a quiet phase and then a rapid cooling started at 6—12 Ma until now with a cooling speed of 5.3—9.8 ℃/Ma or 106—196 m/Ma.  
        关键词：Fission track;Apatite;Cooling;Uplifting;Geological thermal history;Eastern Kunlun Mountains   
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        发布时间：2021-03-12
      • WAN Jinglin1,2 WANG Yu3 LI Qi1 ZHENG Dewen1 LI Daming1 1
        Issue 9, (2005)
        摘要：The apatite fission track results of 14 samples from Taibai Mountain suggest that Taibai Mountain underwent two episodic uplifts. These two uplifts occurred at about 100-80Ma and 40Ma, respectively. These are consistent with the conclusion that Qinling Mountain changed to a new tectonic evolution phase since about late Cretaceous, and this evolution resulted in the basic tectonic geomorphologic pattern of Qinling Mountain.  
        关键词：North Qinling;Taibai Mountain;Fission track   
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        发布时间：2021-03-12
      • FANG Shi LIU Zhaojun GUO Wei
        Issue 9, (2005)
        摘要：Thermal history simulation of Apatite Fission Track shows that the thermal structure history in Cenozoic and the relationship between Songliao Basin and Dahinganling Mountain. Uplift of Dahinganling reveals its act character; its velocity shows 5 decreasing phases and 4 increasing ones. Although basin evolvement is quite complex, it behaved as three uplifts and two sedimentations. It is considered here that the relationship between Songliao Basin and Dahinganling includes three styles and 4 phases, that is, basin uplifted with mountain during 65.5—50 Ma; basin subsided while mountain uplifted slowly and basin uplifted rapidly while mountain uplifted rapidly during 50—36 Ma; basin subsided slowly while mountain uplifted slowly and basin subsided rapidly while mountain uplifted rapidly during 36—5.83Ma; the latest phase was the same with the first one.  
        关键词：Songliao Basin;Dahinganling Mountain;Thermal structure;Coupling;Fission track   
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        发布时间：2021-03-12
      • BAO Zengkuan1,2 YUAN Wanming1 DONG Jinquan1 GAO Shaokai1 1
        Issue 9, (2005)
        摘要：Fission track ages (FTA) and track lengths of apatite from Qing-He diorite intrusion in Altay Mountains are measured. Apatite fission track ages of three diorite samples is range from (78±5) Ma to (95±5) Ma, and the lengths of horizontal confined spontaneous fission tracks are (13.2±1.2)—(13.5±1.3) μm. The distribution of the track length is narrow and symmetrical with a mean length of approximately 13.3 μm and a standard deviation of around 0.1 μm. The inverse modeling results show that thermal history of this region has four stages, two rapid uplift stages and two stable ones. The rapid uplift during the 115—85 Ma with the cooling rate of 2.2 ℃/ Ma suggests that this region still existed magmatic intrusion and tectonic movements in Yanshanian.  
        关键词：Fission-track;Apatite;Geological thermal history;Altay   
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        发布时间：2021-03-12
      • ZOU Shuyun ZHANG Yongbao
        Issue 9, (2005)
        摘要：The human hair samples as standard substances were analyzed by the neutron activation analysis(NAA) on the miniature neutron source reactor. 19 elements, i.e. Al, As, Ba, Br, Ca, Cl, Cr, Co, Cu, Fe, Hg, I, Mg, Mn, Na, S, Se, V and Zn, were measured. The average content, standard deviation, relative standard deviation and the detection limit under the present research conditions were given for each element, and the results showed that the measured values of the samples were in agreement with the recommended values, which indicated that NAA can be used to analyze standard substance human hair with a relatively high accuracy.  
        关键词：Neutron activation analysis;Standard substance;Human hair   
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        发布时间：2021-03-12
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