ASTM-E526 2013

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E526-08(2013) Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium

Published By	Publication Date	Number of Pages
ASTM	2013	4

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Description

ASTM E526-08-Reapproved2013

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

ASTM E526

Scope

1.1 This test method covers procedures for measuring reaction rates by the activation reactions ⁴⁶Ti(n,p) ⁴⁶Sc + ⁴⁷Ti(n, np)⁴⁶Sc.

Note 1—Since the cross section for the (n,np) reaction is relatively small for energies less than 12 MeV and is not easily distinguished from that of the (n,p) reaction, this test method will refer to the (n,p) reaction only.

1.2 The reaction is useful for measuring neutrons with energies above approximately 4.4 MeV and for irradiation times up to about 250 days (for longer irradiations, see Practice E261).

1.3 With suitable techniques, fission-neutron fluence rates above 10⁹ cm^–2·s^–1 can be determined. However, in the presence of a high thermal-neutron fluence rate, ⁴⁶Sc depletion should be investigated.

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.

Keywords

activation reaction; cross section; dosimetry; nuclear metrology; pressure vessel surveillance; reaction rate; titanium

ICS Code

ICS Number Code 17.240 (Radiation measurements)

DOI: 10.1520/E0526-08R13

Additional information

Standard Title	E526-08(2013) Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
Published Code	ASTM
Publication Date	2013
Pages Count	4