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沉淀法分离Cs和Rb的研究 总被引:8,自引:1,他引:7
以^137Cs和^86Rb为示踪剂对硅钨酸铯和碘铋酸铯两种沉淀法分离Cs和Rb进行了研究。结果表明,碘铋酸铯沉淀法比硅钨酸铯沉淀法分离效果好;采用亚化学计量的碘铋酸钾分离时,Cs沉淀率可达70%~80%,Cs、Rb的分离因数大于100。 相似文献
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采用自制的磷酸三丁酯(TBP)萃淋树脂作交换柱,应用反相分配色层法研究了^67Ga与靶材料中Zn,Cu,Ni等元素及活化产物^65Zn,^56Co,^57Co的分离,建立了一个简便、快速生产枸橼酸镓-^67Ga的方法。所得^67Ga的放射性核纯达99.5%,每37MBq^67Ga中其它金属离子总量不超过2.5μg。 相似文献
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采用多接收-电感耦合等离子体质谱仪(MC-ICP-MS)和多接收-热电离同位素质谱仪(MS-TIMS)对溶液中锌同位素丰度比测量结果进行实验室间比对,5个样品68Zn与66Zn的丰度比为0.02~15.00。比对结果显示,5个实验室的测量结果相符性较差,测量不确定度为1.29%~0.03%(以64Zn/66Zn为例),呈现与样品丰度比相关的趋势,相同仪器测量结果的不相符性主要受是否扣除空白及扣除的准确性影响。另外,MC-ICP-MS系统误差校正条件也影响测量的准确性,MC-ICP-MS质量歧视校正系数为非线性。 相似文献
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252Cf中子活化核燃料棒235U富集度均匀性检测装置 总被引:2,自引:1,他引:2
采用^252Cf中子活化方法研制燃料棒^235U富集度均匀性检测设备,用慢化后的^252Cf中子照射燃料棒,使燃料棒UO2芯块中的^235U发生裂变,通过测量其裂变产物的γ射线总强度对燃料棒^235U富集度及其均匀性进行在线检测。采用1.2mg的^252Cf中子源,能检测出燃料棒中^235U富集度相对偏差土10%的单个混料芯块,单根燃料棒的检测速度可达7m/min,检测结果的置信概率为97.74%。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(4):623-627
Chromatographic fractionation of zinc isotopes was performed on the synthesized benzo-15-crown-5 resin as a column packing material at 323K in the breakthrough manner for both a frontal and a rear bands. Zinc adsorption capacity was affected by anion chloride concentration and solvent dielectric constant. The heavier zinc isotopes were found enriched to the solution phase and the lighter zinc isotope was concentrated on the resin phase. The frontal maximum enrichment ratio for isotopic pair of 68Zn/64Zn was 1.0081. The isotope separation coefficients for isotopic pair of 68Zn/64Zn for frontal and rear band, were 5.3 × 10?4, 4.5 × 10?4, respectively. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(5):177-180
Copper-67, the longest-lived radioisotope of copper, was prepared by using the reaction 67Zn(n p,)67Cu. Zinc enriched in 67Zn up to 93.4% was irradiated in JRR-1 reactor for 5hr with a fast neutron flux of 1.5×1012n/cm2/sec. Copper-67 formed in the zinc target was separated by anion exchange separation using the chloro-complex of the metals. The yield of 67Cu and radiochemical impurity were investigated. Seventeen millimicrocuries of 67Cu was obtained from 1mg of zinc. No radioactive impurities other than 64Cu were not found. Even with the use of enriched target, a more MCu was produced than 67Cu. The proportion of 67Cu to total copper radioactivity was 26% immediately after the irradiation. 相似文献
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微堆超热中子活化分析在地学样品测定中的应用 总被引:1,自引:1,他引:0
微型中子源反应堆(简称微堆)是以高浓铀(235 U)作燃料的轻水欠慢化型反应堆,辐照孔道内存在有较大份额的超热中子和快中子,适合进行超热中子活化分析(ENAA)的实验研究。地质样品成分复杂,在用普通的中子活化分析时,基体元素影响了部分元素的准确测定。为降低基体成分的本底干扰、改善目标元素的测量精密度和检出限,可采用超热中子活化分析的方法。本文利用微堆上安装的屏蔽材料为镉的超热中子辐照孔道,测定了元素周期表中67种元素的约130个核素的镉比,讨论了在超热中子活化分析中某些元素的有利因子及铀裂变和(n,p)反应的干扰情况,验证了微堆ENAA方法在地质科学样品检测中的实际应用,证实利用本方法可测定地学样品中20余种元素,其检出限、精密度和准确度均得到了较明显的改善。该法是常规活化分析方法必要的、有益的补充。 相似文献
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J.F.A. Delbeke G. Janssens-Maenhout P. Peerani 《Nuclear Engineering and Design》2007,237(11):1158-1163
This study addresses the issue of alternative pathways for breeding plutonium in a 900 MWe three loop thermal pressurized water reactor (PWR), either fueled with uranium fuel (3.5% U-235) or with mixed fuel (20% MOX). During the operation of a nuclear reactor the in-core neutron flux and the ex-core neutron flux are monitored with flux detectors. At the places where those detectors operate, the guide thimbles and the vessel wall, respectively, the neutron flux can be used to irradiate material samples. This paper investigates whether it would be possible to produce plutonium by breeding it at the walls of a PWR vessel and/or in the guide thimbles. The neutron flux in the reactor and the corresponding multi-group spectra are estimated with Monte Carlo simulations for different positions at the vessel wall of a PWR operating with either UO2 or MOX. Then the irradiation of fresh uranium samples at the vessel wall and in the guide thimbles are calculated and the isotopic composition of the irradiated samples are determined. The minimum irradiation period and the necessary minimum amount of fresh uranium to breed different grades of plutonium are derived. 相似文献
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Tadahiro Kin Takaya Kawagoe Shouhei Araki Yukinobu Watanabe 《Journal of Nuclear Science and Technology》2017,54(10):1123-1130
We conducted a feasibility study for producing a high-purity medical radioisotope 64Cu from natural zinc with accelerator-based neutrons. 64Cu isotopes were produced via the 64Zn(n,p) reaction. The accelerator-based neutrons were generated via the C(d,n) reaction using low-energy deuterons of 9 and 12 MeV on a 1-mm-thick carbon target. First, the production purity was estimated using the evaluated nuclear data library JENDL-4.0 and our previously measured thick target neutron yield. We found that even when natural zinc was used as the starting material, significantly high-purity 64Cu could be obtained. Next, irradiation experiments for producing 64Cu using natural zinc were conducted at Kyushu University Tandem Laboratory, with the amounts of 64Cu isotopes and other gamma-emission nuclides measured by a high-purity germanium detector. As a result, high-purity 64Cu isotopes of 1.11(49) × 100 and 3.70 (17) × 100 Bq/g/μC were produced with incident deuteron energies of 9 and 12 MeV, respectively. 相似文献
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铒(Er)是一种适用于轻水堆(LWR)的长效可燃毒物,Er_2O_3的堆内辐照是研究中子毒物Er辐照性能的基本手段。Er_2O_3在高通量工程试验堆(HFETR)中子注量率约为2×10~(14)/(cm~2·s)的辐照孔道中辐照91.3h。采用热电离质谱法(TIMS)测定辐照前、后样品中Er同位素丰度,跳峰模式测定6个Er同位素,低丰度~(162)Er由法拉第杯检测。测定时准确控制升温测量电流,将蒸发带和电离带电流控制在1 400、5 500mA以下,可减小~(168)Yb、~(170)Yb对~(168)Er、~(170)Er的同量异位素影响。结果表明,经中子辐照后~(166)Er、~(167)Er、~(168)Er同位素丰度变化较大,丰度变化与中子吸收截面大小密切相关。 相似文献