共查询到19条相似文献,搜索用时 46 毫秒
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松针中组织自由水氚的测量 总被引:2,自引:0,他引:2
本文用生物样品与有机溶剂共沸蒸馏分离法对秦山核电厂附近秦山上松针中组织自由水氚进行测量。选择甲苯为共沸蒸馏溶剂。松针与甲苯共沸蒸馏,组织自由水回收率达90%。结果表明,松针中组织自由水氚浓度为1.8 Bq/L,与同期大气中氚化水蒸气(HTO)的浓度在同一水平。 相似文献
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本文介绍生的样品有机溶剂共沸蒸馏--液体闪烁计数测定组织自由水氚法,组织自由水回收率松针,大米为90%;青菜,萝卜为95%;牛奶为85%;猪肉(精)为52%。松针(鲜),青菜,萝卜,大米,猪肉(精)与牛奶组织自由水氚活度为分别为1.8,3.2,1.8,2.7,3.3,4.0Bq/L-H2O。 相似文献
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用蒸馏 液闪法和氧化蒸馏 液闪法分别测量了氚污染人员尿中的氚水和总氚(氚水和有机氚)的浓度。根据72个高于本底水平的尿中氚水和总氚浓度分析结果比较,认为在氚内污染工作人员的尿中,有机氚与氚水的浓度比值为(5.4±3.7)%。 相似文献
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土壤样品中氚水的测定 总被引:3,自引:0,他引:3
本文介绍了土壤中氚水的测定方法,主要包括真空解析与冷凝、制样和液闪测量等步骤。当分析120g湿度为20%的土壤时,方法回收率为96.7%,探测下限为0.70Bq/kg。 相似文献
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本文介绍液体闪烁计数测定有机溶剂共沸蒸馏生物样品组织自由水氚的方法。实验测得甲苯共沸蒸馏新鲜松针、青菜、萝卜、、牛奶、猪肉(精)和大米组织自由水的回收率,分别为0.90、0.95、0.95、0.85、0.52和0.90以及组织自由水氚活度.每升样品水中分别为1.8、3.2、1.8、4.0、3.3和2.7Bq。 相似文献
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我国部分地区食品氚的分布规律初探 总被引:1,自引:0,他引:1
调查了我国北京、兰州、上海和成都四个城市的食品氚浓度,其中食品的游离水氚(TFWT)和有机结合氚(OBT)浓度的平均值分别为4.56Bq·L^-1和29.51Bq·L^-1,食品OBT与TFWT含量的比值(SAR)为6.47。食品OBT浓度由北往南逐渐下降(P〈0.05),与纬度呈高度线性关系。植物类食品的OBT浓度较动物类食品高,且地面生长食品的OBT浓度最高,灌溉类食品最低。 相似文献
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B. N. Kolbasov 《Journal of Fusion Energy》1993,12(1-2):121-126
Radiation safetry criteria adopted in Russia (in the former USSR) distinguish five classes of tritium compounds. The lowest permissible tritium concentration in the air is set for insoluble tritium compounds (3.105 times lower than that for HT). Russia's criteria for tritiated radioactive waste are outlined. It is explained why the tritium weighting factor of two is used as a basis for the tritium dose criteria development in this country. The ecological situation nearby a large tritium processing plant is considered. Amounts of tritiated waste produced at the plant, sources of tritium effluents, tritium content in the air, water, snow, soil and vegetation as well as HTO sorption parameters of various food products are reported. On the basis of HTO near-surface concentrations in the air and public doses measured 3 km away from the plant stack, the tritium dose factor was calculated. 相似文献
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利用氯化聚乙烯、聚偏二氯乙烯(Polyvinylidene chloride,PVDC)、高密度聚乙烯等高分子材料复合防氚材料。采用渗透实验测量氚气渗透率;通过测量断裂强力和剥离力测量力学性能;通过测量浸泡化学试剂前后的溶失率、断裂强力下降率、剥离力下降率等表征材料的耐化学性能。结果表明,氚气在防氚高分子复合材料中的渗透率为3.44×10-10 m3/(m2?s);与PVC相比,氚气渗透率降低约70倍。PVDC薄膜复合后断裂强力提高约20倍,经纬向断裂强力为721 N。防氚高分子复合材料浸泡5种化学试剂后,最大溶失率为0.29%、断裂强力最大下降率为5.1%,其力学性能、耐化学性能均满足《防护服装酸碱类化学品防护服》(GB24540-2009)等相关标准的要求。 相似文献
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《核技术(英文版)》2016,(2):26-34
La_((1-x))Mg_xNi_(4.25)Al_(0.75)(x = 0.0, 0.1, 0.2, 0.3)alloys for tritium storage were prepared by a method of electromagnetic induction melting. The crystal structure and hydrogen storage performance of the as-cast alloys were investigated. The results showed that a single phase of La Ni_4Al was in the alloys with x = 0.0 and 0.1 and that LaNi_4Al and second phase of(La,Mg)Ni)_3 and AlNi_3 were in the alloys with x = 0.2 and 0.3. On the other hand, the plateau pressures of P–C isotherms of the alloys were increased with the rise of the x value from 0.2 to 0.3 and the hydrogen storage capacity was obviously degraded simultaneously. It was found that the alloy had faster absorption kinetics as the proportion of Mg increased from 0.1 to 0.3. 相似文献
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There is an increasing requirement for tritium to supply the fuel needs of current experimental fusion devices and in the initial startup of future power generating reactors. Tritium is produced in heavy water reactors through deuterium activation, but the total production capacity of Canadian operated CANDUs will fall short of future demands, during the period before and for some time after self-sufficient reactors become available. Consequently, methods of enhancing tritium generating rates warrant investigation. Herein we provide the results of an inquiry into the feasibility of enhancing tritium production levels through the activation of helium-3 following its external addition to the heavy water moderator system of a hypothetical 500–600 MWe CANDU reactor. The approach adopted involves simulation of the temporal evolution of the tritium activities, originating from2H(n,)3H and3He(n, p)3H, as described by a simple first order kinetic model. The results suggest that the frequent addition of helium-3 to the moderator water will enhance tritium production inventories. The enhancement factor is highly dependent upon the rate at which helium-3 irretrievably escapes to the moderator cover gas. However, the direct activation of helium-3, contained in a closed loop such as the annulus gas system, for example, would be essentially complete within a few weeks without any significant loss. 相似文献
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SPE固体电解质氚水浓集装置及其应用 总被引:5,自引:0,他引:5
简述了SPE固体聚合膜氚水自动电解浓集装置的工作原理,介绍了在研制该装置中所进行的实验与工作进展,用SPE氚水电解浓集装置处理。IAEA第6次低水平氚国际比对样品(TRIC2000),取得了满意的测量结果。 相似文献
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G. Bellanger 《Fusion Engineering and Design》2009,84(12):2197-2205
Large quantities of tritiated water will be produced in the controlled fusion reactors for power generation. To eliminate the concentrated tritiated water and for recycling tritium, an industrial electrolyzer was developed. The aim of this paper is to give the design of this electrolyzer and the results for optimization in diffusion and in isotopic exchange by selecting thickness of a thimble-shaped Pd-25%Ag cathode working at high temperature and current. In this process, the tritium recovery system is based on the principle of the tritium diffusion Pd-Ag cathode which produces very pure hydrogen isotopes from enriched tritiated water. 相似文献
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介绍了2015年度由本实验室组织的关于土壤和水中放射性核素实验室间测量比对的相关情况。土壤分为掺标土壤和实际土壤两类,水为掺标样品。掺标样品的比对项目包括3H(土壤中不分析)、90Sr、60Co、134Cs和137Cs,实际土壤的比对项目包括238U、232Th、226Ra、40K、90Sr和137Cs。8家单位(11个实验室)参加了本次比对活动,比对结果整体良好。针对比对活动中发现的问题进行了分析,并对以后的比对活动提出了建议。 相似文献
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S. Leray A. Boudard J.C. David D. Mancusi 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(6):581-586
Reliable predictions of light charged particle production in spallation reactions are important to correctly assess gas production in spallation targets. In particular, the helium production yield is important for assessing damage in the window separating the accelerator vacuum from a spallation target, and tritium is a major contributor to the target radioactivity. Up to now, the models available in the MCNPX transport code, including the widely used default option Bertini-Dresner and the INCL4.2-ABLA combination of models, were not able to correctly predict light charged particle yields. The work done recently on both the intranuclear cascade model INCL4, in which cluster emission through a coalescence process has been introduced, and on the de-excitation model ABLA allows correcting these deficiencies. This paper shows that the coalescence emission plays an important role in the tritium and 3He production and that the combination of the newly developed versions of the codes, INCL4.5-ABLA07, now lead to good predictions of both helium and tritium cross-sections over a wide incident energy range. Comparisons with other available models are also presented. 相似文献