ASTM E526-22
Standard Test Method for Measuring Fast-Neutron Reaction Rates By Radioactivation of Titanium

Standard No.

ASTM E526-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E526-22

Scope

1.1 This test method covers procedures for measuring reaction rates by the activation reaction nat Ti(n,X)46 Sc. The “X” designation represents any combination of light particles associated with the production of the residual 46 Sc product. Within the applicable neutron energy range for fission reactor applications, this reaction is a properly normalized combination of three different reaction channels: 46 Ti(n,p)46 Sc; 47 Ti(n, np)46 Sc; and 47 Ti(n,d)46 Sc. NOTE 1—The 47 Ti(n,np)46 Sc reaction, ENDF-6 format file/reaction identifier MF=3, MT=28, is distinguished from the 47 Ti(n,d)46 Sc reaction, ENDF-6 format file/reaction identifier MF=3/MT=104, even though it leads to the same residual product (1).2 The combined reaction, in the IRDFF-II library, has the file/reaction identifier MF=10/MT=5. NOTE 2—The cross section for the combined 47 Ti(n,np:d) reaction is relatively small for energies less than 12 MeV and, in fission reactor spectra, the production of the residual 46 Sc is not easily distinguished from that due to the 46 Ti(n,p) reaction. 1.2 The reaction is useful for measuring neutrons with energies above approximately 4.4 MeV and for irradiation times, under uniform power, up to about 250 days (for longer irradiations, or for varying power levels, 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, 46 Sc 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E526-22 Referenced Document

• ASTM E1005 Standard Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance, E 706(IIIA)
• ASTM E1018 Standard Guide for Application of ASTM Evaluated Cross Section Data File, Matrix E 706 (IIB)
• ASTM E170 Standard Terminology Relating to Radiation Measurements and Dosimetry
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E181 Standard Test Methods for Detector Calibration and Analysis of Radionuclides
• ASTM E261 Standard Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques
• ASTM E456 Standard Terminology for Relating to Quality and Statistics
• ASTM E844 Standard Guide for Sensor Set Design and Irradiation for Reactor Surveillance, E 706(IIC)
• ASTM E944 Standard Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, (IIA)

ASTM E526-22 history

• 2022 ASTM E526-22 Standard Test Method for Measuring Fast-Neutron Reaction Rates By Radioactivation of Titanium
• 2017 ASTM E526-17e1 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
• 2017 ASTM E526-17 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
• 2008 ASTM E526-08(2013) Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
• 2008 ASTM E526-08 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
• 1997 ASTM E526-97(2002) Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium
• 1997 ASTM E526-97 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium