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

ASTM-E264 - 2019 EDITION - CURRENT
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Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
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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

 Correction Values as a
 Function of Irradiation Time and Neutron Flux  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more than 200 days before the end of the irradiation should not be relied upon without supporting data from dosimeters withdrawn earlier.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.

Keywords

activation; activation reaction; cross section; dosimetry; fast-neutron monitor; neutron metrology; nickel; pressure vessel surveillance; reaction rate;; ICS Number Code 17.240 (Radiation measurements); 27.120.30 (Fissile materials and nuclear fuel technology)

To find similar documents by ASTM Volume:

12.02 (Nuclear (II), Solar, and Geothermal Energy)

To find similar documents by classification:

17.240 (Radiation measurements Including dosimetry Radiation protection, see 13.280)

27.120.30 (Fissile materials and nuclear fuel technology Including raw materials Radioactive wastes, see 13.030.30)

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Document Number

ASTM-E264-19

Revision Level

2019 EDITION

Status

Current

Modification Type

Revision

Publication Date

April 1, 2019

Document Type

Test Method

Page Count

4 pages

Committee Number

E10.05