Cookies
Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
ASTM/ISO 51900-23
Standard Guidance for Dosimetry for Radiation Research
NORMA vydaná dňa 1.4.2019
Informácie o norme:
Označenie normy: ASTM/ISO 51900-23
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.4.2019
Kód tovaru: NS-1137916
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM/ISO 51900-23 :
Keywords:
absorbed dose, absorbed-dose mapping, absorbed-dose measurement, bremsstrahlung, dosimetry system, electron beam, gamma radiation, gamma rays, ionizing radiation, measurement uncertainty, radiation research, routine dosimeter, X-radiation, X-ray, ICS 17.240,, ICS Number Code 17.240 (Radiation measurements),67.020 (Processes in the food industry)
Doplňujúce informácie
| Significance and Use |
|
4.1?Reliable dosimetry is indispensable for research on the effects of ionizing radiation on materials and products. Without reliable dosimetry valid conclusions cannot be reached, or the wrong conclusions might be reached. 4.2?This document is intended to provide direction on how to conduct dosimetry for research and experiments on the effects of ionizing radiation on materials and products, and on the reporting of dosimetry results. Requirements on dosimetry and on dose ranges might differ between the various types of experiments to be carried out. 4.3?Proper reporting of the manner in which the irradiation was carried out is important since the degree of radiation effect might be a function of various factors, other than absorbed dose, such as the radiation source, the absorbed-dose rate, energy of the incident radiation, ambient environmental conditions during irradiation, and the type of incident radiation. This document attempts to highlight the information, including the methodology and results of the absorbed-dose measurements, necessary for an experiment to be repeatable by other researchers. 4.4 In most cases an experiment should be designed to irradiate the sample as uniformly as possible. In practice, a certain variation in absorbed dose will exist throughout the sample. Absorbed-dose mapping is used to determine the magnitude, location, and reproducibility of the maximum (Dmax) and minimum absorbed dose (4.5?Computer simulations might provide useful information about absorbed-dose distribution in the irradiated sample, especially near material interfaces (see ASTM E2232), but are not a substitute for dosimetry. |
| 1. Scope |
|
1.1?This document covers essential recommendations for dosimetry needed to conduct research on the effects of ionizing radiation on materials, products and biological samples. Such research includes establishment of the quantitative relationship between absorbed dose and the relevant effects. This document also describes the overall need for dosimetry in such research, and for reporting of the results. Dosimetry should be considered an integral part of the experiment, and the researcher is responsible for ensuring the accuracy and applicability of the dosimetry system used. Note 1:?For research involving food products, note that the
Codex Alimentarius Commission has developed an international
General Standard and a Code of Practice that address the
application of ionizing radiation to the treatment of foods and
which strongly emphasizes the role of dosimetry for ensuring that
irradiation will be properly performed (1).2
Note 2:?This document includes tutorial information in the
form of Notes. Researchers should also refer to the references
provided at the end of the standard, and other applicable
scientific literature, to assist in the experimental methodology as
applied to dosimetry 1.2?This
document covers research conducted using the following types of
ionizing radiation: gamma radiation (typically from Cobalt-60 or
Cesium-137 sources), X-radiation (bremsstrahlung, typically with
energies between 50 keV and 7.5 MeV), and electrons (typically with
energies ranging from 80 keV to more than 10 MeV). See ISO/ASTM
51608, 51649, 51818 and 51702.
1.3?This document describes dosimetry recommendations for establishing the experimental method. It does not include dosimetry recommendations for installation qualification or operational qualification of the irradiation facility. These subjects are treated in ISO/ASTM 51608, 51649, 51818 and 51702. 1.4?This document is not intended to limit the flexibility of the researcher in the determination of the experimental methodology. The purpose of the document is to ensure that the radiation source and experimental methodology are chosen such that the results of the experiment will be useful and understandable to other scientists and regulatory agencies. The total uncertainty in the absorbed-dose measurement results and the absorbed-dose variation within the irradiated sample should be taken into account in the interpretation of the research results (see ISO/ASTM Guide 51707). 1.5?This document is one of a set of standards that provides recommendations for properly implementing dosimetry in radiation processing, and describes a means of achieving compliance with the requirements of ISO/ASTM 52628. This document is thus intended to be read in conjunction with ISO/ASTM 52628. 1.6?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
