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Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
Automaticky preložený názov:
Štandardná skúšobná metóda pre meranie Fast - neutrónov reakčných rýchlostí od Radioactivation nióbu
NORMA vydaná dňa 1.1.1996
Označenie normy: ASTM E1297-96
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.1.1996
Kód tovaru: NS-41172
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
Decay rates, Neutron activation reactions, Niobium and niobium alloys, Radioactivation-fast neutron flux, Threshold detectors-.5 MeV and above, fast neutron reaction rates by radioactivation of niobium, test,, Fast neutron flux/fluence, fast neutron reaction rates by radioactivationof niobium, test,, Irradiance/irradiation, fast neutron reaction rates by radioactivation ofniobium, test,,Order Form, ICS Number Code 27.120.01 (Nuclear energy in general)
1. Scope | ||||||||||||||||||||||
1.1 This test method describes procedures for measuring reaction rates by the activation reaction 93Nb(n,n`)93mNb. 1.2 This activation reaction is useful for monitoring neutrons with energies above approximately 0.5 MeV and for irradiation times up to about 30 years. 1.3 With suitable techniques, fast-neutron reaction rates for neutrons with energy distribution similar to fission neutrons can be determined in fast-neutron fluences above about 1016cm-2. In the presence of high thermal-neutron fluence rates (>1012cm-2[dot] -1), the transmutation of 93mNb due to neutron capture should be investigated. In the presence of high-energy neutron spectra such as are associated with fusion and spallation sources, the transmutation of 93mNb by reactions such as (n,2n) may occur and should be investigated. 1.4 Procedures for other fast-neutron monitors are referenced in Practice E261. 1.5 Fast-neutron fluence rates can be determined from the reaction rates provided that the appropriate cross section information is available to meet the accuracy requirements. 1.6 The values stated in SI units are to be regarded as the standard. 1.7 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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