Results 1 - 10 of 1429
Results 1 - 10 of 1429. Search took: 0.035 seconds
|Sort by: date | relevance|
[en] The International Organization for Standardization (ISO) Guide to the expression of Uncertainty in Measurement (GUM) was developed to meet the demand for a standardized way of evaluating and expressing uncertainties. The Davies and Gray (D and G) titrimetry method is routinely used in nuclear safeguards for uranium accountability measurement and a statement of the uncertainty that can reasonably be attributed to the measured assay value is therefore of importance. A mathematical model for an uncertainty evaluation of D and G measurements in compliance with ISO GUM is presented. This is illustrated by a numerical example and the utilization of the uncertainty budget is explored. (author)
[en] Full text: Ron Young, CEO of Knowledge Associates International, based in Cambridge UK, is Chair of the BSI KM Standards Committee KMS/1, member of the BSI Asset Management Committee AMS/1 working with ISO 55000, and member of the ISO 30401 workgroup developing a global KM Standard. He will present the benefits, challenges and implications of a global KM standard, from his perspective, and give an update on the ISO/BSI standard development. He will also provide insights into the latest developments with knowledge asset management. (author
[en] Minimizing plutonium measurement uncertainty is essential to nuclear material control and international safeguards. In 2005, the International Organization for Standardization (ISO) published ISO 12183 'Controlled-potential coulometric assay of plutonium,' 2nd edition. ISO 12183:2005 recommends a target of ±0.01% for the mass of original sample in the aliquot because it is a critical assay variable. Mass measurements in radiological containment were evaluated and uncertainties estimated. The uncertainty estimate for the mass measurement also includes uncertainty in correcting for buoyancy effects from air acting as a fluid and from decreased pressure of heated air from the specific heat of the plutonium isotopes. (author)
[en] A technique for bibliographic information processing, at the standardized interchange format ISO 2709 or ANSI Z39.2, which allows to obtain programs with data independence is developed. A format definition language and manipulation commands which enable data storage and retrieval at the logical level are specified. With this technique it is possible to implement programs which can accept data from any information system, reducing, therefore, the requirements of a common bibliographic information interchange format. (Author)
[pt]Desenvolve-se uma tecnica de processamento de informacoes bibliograficas, em formato padrao de intercambio ISO 2709 ou ANSI Z39.2, que possibilita obter programas com independencia de dados. Sao especificados uma linguagem de definicao de formatos e comandos de manipulacao que permitem acesso e armazenamento de dados ao nivel logico. A utilizacao desta tecnica possibilita a implementacao de programas capazes de receber dados oriundos de qualquer sistema de informacoes, reduzindo os requisitos de um formato comum de intercambio de informacoes bibliograficas. (Autor)
[en] The determination of characteristic limits in the measurement of radioactive materials is an important aspect of low-level measurements and the underlying principles are well understood by scientists working on such measurements. ISO 11929:2010 provides a rigorous basis for the systematic calculation of detection limits, but may be difficult to interpret for the routine user. This paper attempts to simplify some of the more arcane aspects of this standard. - Highlights: • Determination of characteristic limits in the measurement of radioactive materials. • ISO 11929:2010 provides a rigorous calculation basis, but can appear overcomplicated in some respects. • Attempts to simplify some of the more arcane aspects of this standard.
[en] The above meeting was held in Colombo, Srilanka, on 15-19 August 2005, under the RCA (Regional Cooperative Agreement for Asia and Pacific Region) Project on Advanced Industrial Radiography (RAS/8/100). The objectives of the Meeting were to a)review the national certification systems for NDT, b) introduce basic requirements of ISO17024 and ISO9712, c) review and revise the national requirements for certifying bodies of participating Member States and d) identify ways for mutual recognition of NDT standards and practices of Member States with a view to achieving harmonization at the regional level. 21 participants from 14 RCA Member States and the IAEA Expert Mr. Peter Hayward of New Zealand attended the Meeting. Mr. Prinath Dias, RCA Coordinator represented the IAEA.
[en] For many years, the United States (US) and international consensus standards for nuclear criticality safety (NCS) have provided guidance for those with hands-on operations involving fissionable materials. These consensus standards have been crucial to reducing the number of criticality accidents in process facilities. The last known criticality accident inside the United States was in 1978 (nearly 41 years ago) at the Idaho Chemical Processing Plant, and outside the United States, an accident occurred at Tokai-Mura, Japan, in 1999 (20 years ago). The domestic consensus standards for NCS include the American Nuclear Society (ANS) standards. The ANS Standards Board, the NCS Consensus Committee, and the ANS-8 Subcommittee oversee the development and maintenance of these standards. Currently there are 18 standards in the ANS-8 series: 6 are in revision mode and 12 are in maintenance mode. The international consensus standards for NCS calculations, procedures, and practices are maintained and developed within the International Organization for Standardization, Technical Committee 85 on Nuclear Energy, Subcommittee 5 on Nuclear Fuel Technology, and Working Group 8, 'Nuclear Criticality Safety'. Eight standards are currently available, three standards are in revision mode, and four proposed standards are at various stages of development. This paper provides the NCS community with an overview and status report on domestic and international NCS consensus standards to stimulate interest and to support their continued development. (author)