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

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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.

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

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 (for longer irradiations, see Practice E261).

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 and health practices and determine the applicability of regulatory limitations prior to use.


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


Revision Level

2008 R13 EDITION



Modification Type


Publication Date

Jan. 15, 2013

Document Type

Test Method

Page Count

3 pages

Committee Number