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100MeV直线加速器电荷量测量系统是束流测量系统的一个重要组成部分。介绍了该电荷量测量系统各部分的功能及特性。详细阐述了电荷量测量系统数据处理及误差分析方法,并提出了实验室系统分辨率测量方案。最后给出了该电荷量测量系统的实际测量结果。 相似文献
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针对研究堆动态参数测量现有方法不足,基于反应堆中子噪声分析方法,设计了一套核功率测量系统。该系统通过对信号前置放大和信号调理的自适应控制测量反应堆临界后的核功率,实现反应堆中子噪声和核功率的智能化、自动化监测。试验测量结果表明:该系统测量的核功率与中子注量率分布测量的理论计算功率值一致,验证了系统测量的有效性,为反应堆核功率测量提供了一种便捷、可靠的测量手段。 相似文献
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用测量精度评价测量质量由来已久,但也颇有争议。由于人们对精度定义理解的不同,导致了日常使用和部分标准中表述的多样化。在放射性勘查测量应用中,也缺乏明确的定义和统一的表示方法。文章对测量精度及相关术语定义及使用进行了梳理,并列举了在有关技术规范和仪器说明书中的应用条文,总结其属于测量过程中的随机效应使测量结果不能完全重复或复现的一个测量质量评价指标,该指标不包含系统误差。最后给出了放射性勘壹测量中定点定时累积和移动定时累积两种测量方式的测量精度评价方法。 相似文献
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介绍了全国辐射环境监测网络放射性气溶胶中γ核素测量考核情况及其结果分析。采用稳健统计方法处理测量结果表明,87.8%的测量值为满意结果,6.1%的测量值为有问题结果,6.1%的测量值为离群。通过比较测量结果的中位值与参考值,发现各核素测量值可能存在负的系统误差。利用此次考核,基本了解了全国辐射环境监测网络气溶胶中γ核素测量水平,为进一步做好网络质保工作提供了依据。 相似文献
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电磁脉冲辐射场试验中的光纤传输测量系统 总被引:1,自引:0,他引:1
辐射波电磁脉冲模拟器是进行大型电子系统电磁脉冲效应试验研究的重要设备。针对辐射波电磁脉冲模拟器试验的特点及其对测量系统的要求,介绍了基于光纤传输的电磁脉冲测量系统的构成,测量系统的分类及测量系统的标定方法。并对电磁脉冲测量系统的不确定度评定方法进行了讨论。通过辐射场试验,给出了测量系统的应用实例及对测量结果的分析。 相似文献
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高级微机ISA总线上的多功能接口板 总被引:1,自引:0,他引:1
介绍了一个应用于Pentium机型上ISA总线的接口电路,这个接口电路具有高速度,高可靠性的特点,是为光谱测量与能级寿命测量装置的控制及数据获取系统专门设计研制的。 相似文献
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YIN Xin-yi ZHANG Jin-song HE Ming JIANG Shan 《中国原子能科学研究院年报》2005,(1):122-122
^151Sin with its half-life of 90 years is a long-lived radionuclide. It is very interesting for nuclear physics, environment sciences and life sciences to detect trace amounts of ^151Sin. AMS with high sensitivity is a kind of nuclear technique for the measurement of trace amounts of ^151Sin. 相似文献
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测定79Se时由于79Se尚无标准样品,需要建立79Se/Se(79Se、Se原子个数比,余同)的AMS测量方法。在79Se/Se的绝对测定中,为尽可能避免测量Se的同位素之间的差异,通常利用探测器测量79Se离子,本文用法拉第筒对78Se和80Se进行测量,但这造成两个测量系统之间的系统误差。为避免这种系统误差,利用同一探测器测定79Se、78Se和80Se。考虑到78Se和80Se的计数率非常高,在CIAE-AMS系统中的静电分析器前和靶室内安装衰减片以降低78Se和80Se的计数率。实验结果表明:通过两个衰减片的衰减作用,能将78Se和80Se的束流降低到半导体探测器的检测范围内,实现了样品中79Se/Se的绝对测定,得到79Se/Se为(2.08±0.10)×10-7,为准确测定79Se半衰期奠定了基础。 相似文献
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M.J. Jacobus 《Nuclear Engineering and Design》1990,118(3)
Sandia National Laboratories is currently conducting long-term aging research on representative samples of nuclear power plant Class lE cables. The objectives of this program are to determine the suitability of these cables for extended life (beyond 40-year design basis) and to assess various cable condition monitoring (CM) techniques for predicting remaining cable life. The cables are being aged for long times at relatively mild exposure conditions with various CM techniques being employed during the aging process. Following the aging process, the cables will be exposed to a sequential accident profile consisting of high dose rate irradiation followed by a simulated design basis loss-of-coolant accident (LOCA) steam exposure.This paper covers two aspects of the research program: the laboratory measurements and on-line electrical measurement techniques that have been developed and are being performed and initial data that has been generated from the on-line measurements. The electrical measurement results presented include insulation resistance, polarization index, capacitance, and dissipation factor from a few of the cable samples tested. 相似文献
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Calandria tubes and liquid injection shutdown system nozzles in a pressurized heavy water reactor are to sag due to irradiation creep and growth during plant operation. When the sag of calandria tube becomes bigger, the calandria tube possibly comes in contact with liquid injection shutdown system tube crossing beneath the calandria tube. The contact subsequently may cause the damage on the calandria tube resulting in unpredicted outage of the plant. It is therefore necessary to check the gap between the two tubes in order to periodically confirm no contact by using a proper measure during the plant life. An ultrasonic gap measurement probe assembly which can be inserted into two viewing ports of the calandria was developed in Korea and utilized to measure the sag between both tubes in the reactor. It was found that the centerlines of calandria tubes and liquid injection shutdown system tubes can be precisely detected by ultrasonic wave. The gaps between two tubes were easily obtained from the relative distance of the measured centerline elevations of the tubes. Based on the irradiation creep equation and the measurement data, a computer program to calculate the sags was also developed. With the computer program, the sag at the end of plant life was predicted. 相似文献
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A survey of the new work in the neutron monitoring of a nuclear power reactor is presented. The sensors have been moved into the reactor and the three modes of measurement necessary to cover the ten decades of the in-core neutron range from startup to rated power are described. The system specifications and life performance data are reviewed. Several innovative extensions of in-core monitoring such as the traversing probe and the Campbell method are covered in detail. 相似文献
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~(90) Y是一种非常重要的治疗用放射性核素,准确测定~(90) Y的半衰期对理论研究和实际应用均具有重要意义。目前对~(90 )Y半衰期的测定已有大量文献报道,但是测定结果不确定度较大,从63.46h到64.6h不等。本工作利用液体闪烁谱仪对HDEHP-甲苯直接萃取的纯~(90) Y半衰期进行测定,并给出了结果的不确定度。~(90) Y半衰期的测定结果为64.05h,不确定度为0.017%。 相似文献