ASTM-E264 2008

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E264-08 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel

Published By	Publication Date	Number of Pages
ASTM	2008	3

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Description

ASTM E264-08

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

ASTM E264

Scope

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 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 E 261).

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 E 261.

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.

Note—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).

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

Keywords

activation; activation reaction; cross section; dosimetry; fast-neutron monitor; neutron metrology; nickel; pressure vessel surveillance; reaction rate; Fast neutron flux/fluence; Neutron activation reactions; Nickel; Nickel alloys; Radioactivation–fast neutron flux; Threshold detectors–1 MeV

ICS Code

ICS Number Code 17.240 (Radiation measurements)

DOI: 10.1520/E0264-08

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology Summary of Test Method FIG. 1
2	Significance and Use Apparatus Materials Procedure FIG. 2
3	Calculations Report Precision and Bias Keywords

Additional information

Standard Title	E264-08 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
Published Code	ASTM
Publication Date	2008
Pages Count	3