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ASTM E 523 : 2007

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Copper
Available format(s)

Hardcopy , PDF

Superseded date

11-11-2014

Language(s)

English

Published date

01-06-2007

1.1 This test method covers procedures for measuring reaction rates by the activation reaction 63Cu(n,)60Co. The cross section for 60Co produced in this reaction increases rapidly with neutrons having energies greater than about 5 MeV. 60Co decays with a half-life of 1925.28 days (0.5 days)() and emits two gamma rays having energies of 1.1732228 and 1.332492 MeV (). The isotopic content of natural copper is 69.17 % 63Cu and 30.83 % 65Cu(). The neutron reaction, 63Cu(n,)64Cu, produces a radioactive product that emits gamma rays which might interfere with the counting of the 60Co gamma rays.

1.2 With suitable techniques, fission-neutron fluence rates above 109 cm2s1 can be determined. The 63Cu(n,)60Co reaction can be used to determine fast-neutron fluences for irradiation times up to about 15 years (for longer irradiations, see Practice E 261).

1.3 Detailed procedures for other fast-neutron detectors are referenced in Practice E 261.

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.

Committee
E 10
DocumentType
Test Method
Pages
3
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

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£55.10
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