ASTM E263

1.1 This test method describes procedures for measuring reaction rates by the activation reaction ⁵⁴Fe(n,p)⁵⁴Mn.

1.2 This activation reaction is useful for measuring neutrons with energies above approximately 2.2 MeV and for irradiation times up to about 3 years (for longer irradiations, see Practice E 261).

1.3 With suitable techniques, fission-neutron fluence rates above 10⁸ cm²s¹ can be determined. However, in the presence of a high thermal-neutron fluence rate (for example, >2 10¹⁴ cm²s ¹) ⁵⁴Mn depletion should be investigated.

1.4 Detailed procedures describing the use of 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.

2. Referenced Documents

D1193 Specification for Reagent Water
E1005 Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance, E706(IIIA)
E1018 Guide for Application of ASTM Evaluated Cross Section Data File, Matrix E706(IIB)
E170 Terminology Relating to Radiation Measurements and Dosimetry
E181 Test Methods for Detector Calibration and Analysis of Radionuclides
E261 Practice for Determining Neutron Fluence Rate, Fluence, and Spectra by Radioactivation Techniques
E844 Guide for Sensor Set Design and Irradiation for Reactor Surveillance, E706(IIC)
E944 Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, E706(IIA)

Index Terms

fast neutron detector; iron activation; reatction rate; ⁵⁴Fe (n,p); ICS Number Code 17.240; 27.120.30

Citing ASTM Standards

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