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ASTM International - ASTM E1297-08

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium

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Organization: ASTM International
Publication Date: 1 July 2008
Status: inactive
Page Count: 6
ICS Code (Nuclear energy in general): 27.120.01
significance And Use:

p>Refer to Practice E 261 for a general discussion of the determination of decay rates, reaction rates, and neutron fluence rates with threshold detectors (1-29). Refer to Practice E 1006,... View More

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·s−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 E 261.

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 standard. No other units of measurement are included in this 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.

Document History

June 1, 2018
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
5.1 Refer to Practice E261 for a general discussion of the determination of decay rates, reaction rates, and neutron fluence rates with threshold detectors (1-29).3 Refer to Practice E1006, Practice...
January 1, 2013
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
5.1 Refer to Practice E261 for a general discussion of the determination of decay rates, reaction rates, and neutron fluence rates with threshold detectors (1-29).3 Refer to Practice E1006, Practice...
ASTM E1297-08
July 1, 2008
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
p>Refer to Practice E 261 for a general discussion of the determination of decay rates, reaction rates, and neutron fluence rates with threshold detectors (1-29). Refer to Practice E 1006 , Practice...
June 10, 2002
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
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...
January 1, 1996
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Niobium
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...
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