ASTM E263 - 18 - Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Iron

ASTM E263 - 18

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

Status : Current   Published : December 2018



1.1 This test method describes procedures for measuring reaction rates by the activation reaction 54Fe(n,p) 54Mn.

1.2 This activation reaction is useful for measuring neutrons with energies above approximately 2.2 MeV and for irradiation times up to about three years, provided that the analysis methods described in Practice E261 are followed. If dosimeters are analyzed after irradiation periods longer than three years, the information inferred about the fluence during irradiation periods more than three years before the end of the irradiation should not be relied upon without supporting data from dosimeters withdrawn earlier.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 above 10 8 cm −2·s −1 can be determined. However, in the presence of a high thermal-neutron fluence rate (for example, >2 × 10 14 cm −2·s −1) 54Mn depletion should be investigated.

1.4 Detailed procedures describing the use of 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 E263 - 18
TitleStandard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Iron
Publication Date01 December 2018
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 fast neutron detector, iron activation, reaction rate, 54Fe(n, p)
File Size127 KB

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