ASTM-E523 2007

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E523-07 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Copper

Published By	Publication Date	Number of Pages
ASTM	2007	3

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Categories: 27.120.30 - Fissile materials and nuclear fuel technology, ASTM

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Description

1.1 This test method covers procedures for measuring reaction rates by the activation reaction ⁶³ Cu(n,) ⁶⁰ Co. The cross section for ⁶⁰ Co produced in this reaction increases rapidly with neutrons having energies greater than about 5 MeV. ⁶⁰ Co 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 % ⁶³ Cu and 30.83 % ⁶⁵ Cu () . The neutron reaction, ⁶³ Cu(n,) ⁶⁴ Cu, produces a radioactive product that emits gamma rays which might interfere with the counting of the ⁶⁰ Co gamma rays.

1.2 With suitable techniques, fission-neutron fluence rates above 10 ⁹ cm ² s ¹ can be determined. The ⁶³ Cu(n,) ⁶⁰ Co 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.

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

Additional information

Standard Title	E523-07 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Copper
Published Code	ASTM
Publication Date	2007
Pages Count	3
ICS Codes	27.120.30 - Fissile materials and nuclear fuel technology

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ASTM-E523 2007

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