ASTM E264 - 19 - Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel

ASTM E264 - 19

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

Status : Current   Published : April 2019

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

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

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[This image has been removed.]

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more than 200 days before the end of the irradiation should not be relied upon without supporting data from dosimeters withdrawn earlier.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 10 7 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.




Standard NumberASTM E264 - 19
TitleStandard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
StatusCurrent
Publication Date01 April 2019
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors activation, activation reaction, cross section, dosimetry, fast-neutron monitor, neutron metrology, nickel, pressure vessel surveillance, reaction rate
ICS17.240
27.120.30
PublisherASTM
FormatA4
DeliveryYes
Pages4
File Size120 KB
Price£36.00


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