ASTM International - ASTM E264-19

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

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Organization: ASTM International
Publication Date: 1 April 2019
Status: active
Page Count: 4
ICS Code (Radiation measurements): 17.240
ICS Code (Fissile materials and nuclear fuel technology): 27.120.30
significance And Use:

5.1 Refer to Guide E844 for the selection, irradiation, and quality control of neutron dosimeters.

5.2 Refer to Practice E261 for a general discussion of the determination of fast-neutron... View More

scope:

1.1 This test method covers procedures for measuring reaction rates by the activation reaction 58Ni(n,p)58Co.

FIG. 1 R Correction Values as a Function of Irradiation Time and Neutron Flux

Note 1: The burnup corrections were computed using effective burn-up cross sections of 1650 b for  58Co(n,γ) and 1.4E5 b for  58mCo(n,γ).

1.2 This activation reaction is useful for measuring neutrons with energies above approximately 2.1 MeV and for irradiation times up to about 200 days in the absence of high thermal neutron fluence rates, provided that the analysis methods described in Practice E261 are followed. If dosimeters are analyzed after irradiation periods longer than 200 days, the information inferred about the fluence during irradiation periods more than 200 days before the end of the irradiation should not be relied upon without supporting data from dosimeters withdrawn earlier.

1.3 With suitable techniques fission-neutron fluence rates densities above 107 cm−2·s −1 can be determined.

1.4 Detailed procedures for other fast-neutron detectors are referenced in Practice E261.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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.

Document History

ASTM E264-19
April 1, 2019
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
5.1 Refer to Guide E844 for the selection, irradiation, and quality control of neutron dosimeters. 5.2 Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence...
January 1, 2013
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
5.1 Refer to Guide E844 for the selection, irradiation, and quality control of neutron dosimeters. 5.2 Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence...
July 1, 2008
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
Refer to Guide E 844 for the selection, irradiation, and quality control of neutron dosimeters. Refer to Practice E 261 for a general discussion of the determination of fast-neutron fluence rate...
June 10, 2002
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
1.1 This test method covers procedures for measuring reaction rates by the activation reaction 58Ni(n,p) 58Co. 1.2 This activation reaction is useful for measuring neutrons with energies above...
January 1, 1996
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
1.1 This test method describes procedures for measuring reaction rates by the activation reaction 58 Ni(n,p) 58 Co. 1.2 This activation reaction is useful for measuring neutrons with energies above...
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