1999—2001年度BIPM放射性剂量比对与刻度情况简介

0　概述国际计量局 (ＢＩＰＭ)主要任务是研制与保存“国际水平”计量基标准装置 ,并通过适当的手段将其量值向世界各国初级和次级标准实验室进行传递。为保证其量值的准确与可靠性 ,ＢＩＰＭ经常组织世界各国标准实验室之间进行有关计量比对与刻度的活动。本文简单介绍了 1 999～ 2 0 0 1年度在ＢＩＰＭ进行的放射性剂量比对与刻度的情况 ,由于文章篇幅所限 ,所涉及物理量较多 ,具体的比对与刻度的结果请查看本文所列的参考文献。1　引言目前在ＢＩＰＭ已有 2 8个国家计量院和国际原子能机构分别按照空气比释动能 (Ｋ空)、石墨吸收剂量 (Ｄ…     

2001～2003年度BIPM放射性剂量比对与刻度

本文简单介绍了2001～2003年底，在BIPM进行的放射性剂量比对与刻度情况。     

2001～2003年度BIPM放射性剂量比对与刻度

本文简单介绍了 2 0 0 1～ 2 0 0 3年底 ,在BIPM进行的放射性剂量比对与刻度情况     

2005～2007年度BIPM放射性剂量比对与刻度情况简介

本文系统的介绍了国际计量局(BIPM)2005～2007年度组织世界各国初级标准实验室放射性剂量的比对和刻度情况,以及BIPM到2009年的放射性剂量的比对和刻度计划.     

2005~2007年度BIPM放射性剂量比对与刻度情况简介

本文系统的介绍了国际计量局(BIPM)2005~2007年度组织世界各国初级标准实验室放射性剂量的比对和刻度情况,以及BIPM到2009年的放射性剂量的比对和刻度计划。     

2007—2009年国际计量局辐射剂量比对与刻度

根据国际计量局第19届电离辐射咨询委员会会议报告,总结了2007—2009年世界范围内电离辐射领域的计量活动,以及近两年在国际计量局进行的辐射剂量国际比对和刻度情况,并介绍了我国电离辐射剂量领域的国际比对情况。     

2007-2009年国际计量局辐射剂量比对与刻度

根据国际计量局第19届电离辐射咨询委员会会议报告,总结了2007~2009年世界范围内电离辐射领域的计量活动,以及近两年在国际计量局进行的辐射剂量国际比对和刻度情况,并介绍了我国电离辐射剂量领域的国际比对情况。     

1998～1999年度日本气体综述

按气体品种分别综述了 1998～ 1999年度日本气体市场的产销量、增长率及销售额。主要气体公司的生产、经营状况 ,主流应用及今后发展方向     

1999～2001年日本气体设备市场综述

综述了1999－2001年日本气体设备市场状况。     

全国圆光栅量值比对情况简介

1984年3月至7月,在中国计量测试学会几何量专业委员会角度专业组和中国仪器仪表学会光学仪器学会刻划技术专业组协助下,由中国计量科学研究院主持开展了一次全国性的圆光栅量值比对工作。参加比对的单位有:航天工业部303所、上海计量测试技术研究所、     

An International Comparison of Inductive Voltage Divider Calibrations at 400 and 1000 Hz

The establishment and maintenance of the highest possible order of accuracy for the measurements of voltage ratio and phase angle are responsibilities of the national laboratories. This paper reports the results of an international comparison of a seven-decade inductive voltage divider by the United States National Bureau of Standards and the National Research Council of Canada. The calibration techniques used in each laboratory are discussed in detail, and the results of calibration at 400 and 1000 Hz are compared. The accuracies of measurements are within 0.1 ppm of input for voltage ratio and 1 (setting of dials)1/2 microradians for phase angle.     

Comparison of the NIST and BIPM Medium-Energy X-Ray Air-Kerma Measurements

The air-kerma standards used for the measurement of medium-energy x rays were compared at the National Institute of Standards and Technology (NIST) and at the Bureau International des Poids et Mesures (BIPM). The comparison involved a series of measurements at the BIPM and the NIST using the air-kerma standards and two NIST reference-class transfer ionization standards. Reference beam qualities in the range from 60 kV to 300 kV were used. The results show the standards to be in agreement within the combined standard uncertainty of the comparison of 0.35 %.     

传递水三相点容器在国际计量局的比对

国际计量局作为主导实验室组织了由20个国家计量标准实验室参加的CCT-K7水三相点容器国际关键比对.按照比对协议,参加者均选择了1个校准的传递容器送到国际计量局与两个共同的参照容器进行比对.介绍了国际计量局的比对,包括:冻制方法、实验装置、测量步骤、比对结果及相应的不确定度评定.比对结果表明:多数水三相点容器在0.15 mK范围内一致.     

Comparison between the 127I2 Stabilized He-Ne Lasers at 633 nm and 612 nm of the BIPM and the IMGC

In November 1981, a comparison between BIPM and IMGC He-Ne lasers stabilized to saturated absorption lines of 127I2, at the wavelengths ? = 633 nm and ? = 612 nm has been made at the BIPM. At 633 nm, a repeatability and a reproducibility within +1 × 10-11 · ? have been obtained. At 612 nm, a repeatability within a few 10-11 · ? only for one laser and a reproducibility of ± 2 × 10-10 · ? have been obtained.     

低能X射线空气比释动能国际关键比对

为促进我国在低能X射线空气比释动能计量领域内的量值统一并达到国际等效,中国计量科学研究院(NIM)于2018年采用平板自由空气基准电离室复现低能X射线空气比释动能,并通过传递电离室Radcal-RC6M在国际计量局(BIPM)低能X射线辐射场中开展了间接比对,其比对结果在合成标准不确定度为0.37%范围内与国际计量局等效一致,该比对结果已纳入国际计量局的关键比对数据库(KCDB)。     

Comparison of the NIST and BIPM Standards for Air Kerma in Medium-Energy X-Rays

A comparison has been made of the air-kerma standards for medium-energy x-rays of the National Institute of Standards and Technology (NIST) and the Bureau International des Poids et Mesures (BIPM). The comparison involved a series of measurements at the BIPM and the NIST using the air-kerma standards and three NIST reference-class transfer ionization chamber standards. Reference beam qualities in the range from 100 kV to 250 kV were used. The results show the standards to be in reasonable agreement within the combined standard uncertainty of the comparison of 0.37 %, although a significant trend with radiation quality is observed and the possible sources discussed.     

Intramural Comparison of NIST Laser and Optical Fiber Power Calibrations

The responsivity of two optical detectors was determined by the method of direct substitution in four different NIST measurement facilities. The measurements were intended to demonstrate the determination of absolute responsivity as provided by NIST calibration services at laser and optical-communication wavelengths; nominally 633 nm, 850 nm, 1060 nm, 1310 nm, and 1550 nm. The optical detectors have been designated as checks standards for the purpose of routine intramural comparison of our calibration services and to meet requirements of the NIST quality system, based on ISO 17025. The check standards are two optical-trap detectors, one based on silicon and the other on indium gallium arsenide photodiodes. The four measurement services are based on: (1) the laser optimized cryogenic radiometer (LOCR) and free field collimated laser light; (2) the C-series isoperibol calorimeter and free-field collimated laser light; (3) the electrically calibrated pyroelectric radiometer and fiber-coupled laser light; (4) the pyroelectric wedge trap detector, which measures light from a lamp source and monochromator. The results indicate that the responsivity of the check standards, as determined independently using the four services, agree to within the published expanded uncertainty ranging from approximately 0.02 % to 1.24 %.