共查询到20条相似文献,搜索用时 31 毫秒
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Krassimira Ilieva Sergey Belousov Antonio Ballesteros Bohumil Osmera Sergey Zaritsky 《Progress in Nuclear Energy》2009,51(1):1-13
A state of the art review of Reactor Dosimetry used for reactor pressure vessel irradiation damage assessment and lifetime evaluation of the Russian type VVER reactors is presented. The necessity of prospective studies in Reactor Dosimetry for improvements that will reduce the neutron fluence uncertainty and in this way to substantiate the extension of NPP lifetime is summarized by specialists in Reactor Dosimetry from countries operating VVER reactors such as Russia, Ukraine, Czech Republic, Finland, Hungary, and Bulgaria, together with specialists from Western European countries such as France, Spain, Germany, Belgium, The Netherlands, and UK, operating PWR and BWR type reactors. 相似文献
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60Coγ辐射剂量场分布理论计算的计算机程序开发 总被引:1,自引:0,他引:1
钴源辐照装置的剂量场分布对提高射线利用率和产品辐照质量至关重要,利用Visual Basic编制了辐射剂量场分布计算程序。程序将计算、排源及参数调整独立分开,操作简便,主要适用于3层排列板源结构。程序经过用于本中心板源,辐射剂量场分布的计算结果基本反映了辐射剂量场的实际分布。 相似文献
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Cross-section ratios of reaction 93Nb(n,2n)92mNb and 197Au(n,2n)196Au to the standard reaction 27Al(n,α)24Na have been measured in order to test the recently compiled dosimetry files: JENDL Dosimetry File and International Reactor Dosimetry File 1990 (IRDF-90). The experimental results for both reactions were consistent with the calculated ones based on IRDF-90 except for the 93Nb(n,2n)92mNb above 19 MeV.Both reactions, especially 93Nb(n,2n)92mNb, were recommended as new neutron monitors above 12 MeV because of their favorable characteristics from the decay-property and cross-section viewpoints. 相似文献
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A. Benuzzi 《Nuclear Engineering and Design》1987,100(2)
The CONT benchmark calculation exercise is a project sponsored by the Containment Loading and Response Group, a subgroup of the Safety Working Group of the Fast Reactor Coordinating Committee — CEC. A full-size typical pool-type LMFBR undergoing a postulated Core Disruptive Accident (CDA) has been defined by Belgonucleaire-Brussels under a study contract financed by the CEC and has been submitted to seven containment code calculations. The results of these calculations are presented and discussed in this paper. 相似文献
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热释光测量法在空间辐射剂量学中的应用 总被引:2,自引:0,他引:2
空间电离辐射是带电粒子辐射,为了保障人类航天活动的辐射安全,空间辐射剂量学得到了很大的发展。热释光测量法已被证明是空间辐射剂量不研究的优选方法之一,它广泛应用于国内外航天器舱内累积剂量的测量。其中,氟化锂已成为必用的热释光探测器。研究其质子响应特性的发光量与空间剂量的关系是将氟化锂应用于空间要作的重要工作。本文介绍了国外应用情况和自己的工作。 相似文献
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Wazir Muhammad Asad Ullah Gulzar Khan Tahir Zeb Khan Tauseef Jamaal Fawad Ullah Matiullah Khan Amjad Hussain 《核技术(英文版)》2018,(5)
For precise and accurate patient dose delivery,the dosimetry system must be calibrated properly according to the recommendations of standard dosimetry protocols such as TG-51 and TRS-398. However, the dosimetry protocol followed by a calibration laboratory is usually different from the protocols that are followed by different clinics, which may result in variations in the patient dose.Our prime objective in this study was to investigate the effect of the two protocols on dosimetry measurements.Dose measurements were performed for a Co-60 teletherapy unit and a high-energy Varian linear accelerator with 6 and 15 MV photon and 6, 9, 12, and 15 MeV electron beams, following the recommendations and procedures of the AAPM TG-51 and IAEA TRS-398 dosimetry protocols. The dosimetry systems used for this study were calibrated in a Co-60 radiation beam at the Secondary Standard Dosimetry Laboratory(SSDL) PINSTECH,Pakistan, following the IAEA TRS-398 protocol. The ratio of the measured absorbed doses to water in clinical setting,D_w(TG-51/TRS-398), was 0.999 and 0.997 for 6 and15 MV photon beams,whereas these ratios were 1.013,1.009, 1.003, and 1.000 for 6, 9, 12, and 15 MeV electron beams, respectively. This difference in the absorbed dosesto-water D_w ratio may be attributed mainly due to beam quality(K_Q) and ion recombination correction factor. 相似文献
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中国聚变工程实验堆(Chinese Fusion Engineering Testing Reactor,CFETR)的包层和偏滤器第一壁面向堆芯等离子体,第一壁辐照损伤分析对于托克马克安全运行至关重要。赤道面外包层较其它包层距离堆芯等离子体中心更近,其结构材料承受中子辐照大。因此,进行中子辐照损伤评估十分必要。基于此目的,采用计算机辅助设计(Computer Aided Design,CAD)模型和蒙特卡罗中子学建模转换接口Mc CAD完成中子学建模,并用蒙特卡罗方法的粒子输运程序计算第一壁和氦冷固态外包层结构材料辐照损伤。此外,对比了铍和钨作为面向等离子体材料两种情况下第一壁的受损情况。计算结果表明,氦冷固态包层模型下结构材料可以满足CFETR一期的运行要求。 相似文献
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在中国向ITER(International Thermonuclear Experiment Reactor)实验包层工作组提交的双功能锂铅实验包层模块(DFLL-TBM)设计分析的基础上,通过对DFLL-TBM系统相关的瞬态事故如真空室内部冷却剂泄漏、TBM(实验包层模块)内部冷却剂泄漏以及真空室外部冷却剂泄漏事故进行计算分析,评价DFLL-TBM对ITER在热工方面对安全的影响.结果表明:当发生瞬态事故时,DFLL-TBM有能力通过热辐射将余热排出,且包层结构不会熔化.DFLL-TBM可满足ITER在热工方面对安全的要求. 相似文献
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压水堆核电厂反应堆压力容器辐照脆化评价与监督 总被引:1,自引:0,他引:1
反应堆压力容器是压水堆核电厂的核心关键设备,受快中子(E1MeV)辐照造成的辐照脆化是其运行失效的重要因素,因此需要对压力容器进行辐照评价与监督,以保证其寿期内的安全运行。 相似文献
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Calculations have been performed to indicate the effects of differing device caps and of spectrum filtration on dosimetry errors in flash x-ray parts testing. Dosimetry typically used for upset or latch-up testing of microelectronic devices with flash x-ray sources can be in error by 300% or more due to interface dose enhancement effects. When the use of spectrum hardening is permissible, placing the device to be irradiated within a Pb/Ta box can reduce the dosimetry errors to less than 20% in most cases. Obtaining the interface dose enhancement factor by using the experimentally obtained ratio of effects on devices behind Kovar/Au caps to effects measured using alumina caps is shown to give erroneous results. 相似文献
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This paper presents a discussion of neutron interactions with materials that lead to activation, transmutation, and atomic displacements. The emphasis will be on current applications including neutron irradiation facilities, neutron dosimetry techniques, and computer codes for spectral adjustment and radiation damage calculations. 相似文献
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X射线水吸收剂量是辐射剂量学的重要物理量,它的精确测量在放射治疗中至关重要。开展低能X射线水吸收剂量的研究与测量,可为完善水吸收剂量溯源体系及扩宽计量部门校准范围提供重要技术支持。确定低能X射线水吸收剂量的测量方法,在辐射场中使用PTW23344电离室对10-50 k V的治疗水平辐射质下的X射线水吸收剂量进行了测量。最终得到了电离室的水吸收剂量刻度因子N_D以及厚度为6 cm有机玻璃前表面的水吸收剂量D_W。本项工作为建立国内X射线水吸收剂量标准及进行国际比对提供了条件和基础。 相似文献
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光核反应数据在辐射损伤、反应堆剂量、加速器屏蔽等方面有重要应用。本工作基于MEND-G程序,对200 MeV能量范围内光子诱发50,51V核反应数据进行理论计算,给出包含中子、质子、4He等主要出射粒子的核反应的数据;对光子诱发V同位素核反应的实验测量进行自洽性分析,结合光子强度函数和准氘模型,将光核反应吸收截面计算能力提升到200 MeV,为光核反应理论计算提供数据基础。经系统比对,理论计算值与实验测量值一致性很好,数据收录在即将发布的CENDL-3.2光核子数据库中。 相似文献
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