ASTM E261-15 - 1.6.2015
 
Significance and Use

5.1 Transmutation Processes—The effect on materials of bombardment by neutrons depends on the energy of the neutrons; therefore, it is important that the energy distribution of the neutron fluence, as well as the total fluence, be determined.

 
1. Scope

1.1 This practice describes procedures for the determination of neutron fluence rate, fluence, and energy spectra from the radioactivity that is induced in a detector specimen.

1.2 The practice is directed toward the determination of these quantities in connection with radiation effects on materials.

1.3 For application of these techniques to reactor vessel surveillance, see also Test Methods E1005.

1.4 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.

Note 1: Detailed methods for individual detectors are given in the following ASTM test methods: E262, E263, E264, E265, E266, E343, E393, E481, E523, E526, E704, E705, and E854.

 
2. Referenced Documents

E393-19

Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters

E264-19

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel

E266-23

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Aluminum

E265-15(2020)

Standard Test Method for Measuring Reaction Rates and Fast-Neutron Fluences by Radioactivation of Sulfur-32

E1018-20e1

Standard Guide for Application of ASTM Evaluated Cross Section Data File (Includes all amendments and changes 7/2/2020).

E2005-21

Standard Guide for Benchmark Testing of Reactor Dosimetry in Standard and Reference Neutron Fields

E722-19

Standard Practice for Characterizing Neutron Fluence Spectra in Terms of an Equivalent Monoenergetic Neutron Fluence for Radiation-Hardness Testing of Electronics

E844-18

Standard Guide for Sensor Set Design and Irradiation for Reactor Surveillance

E481-23

Standard Practice for Measuring Neutron Fluence Rates by Radioactivation of Cobalt and Silver

E523-21e1

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Copper (Includes all amendments and changes 5/3/2021).

E526-22

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

E693-23

Standard Practice for Characterizing Neutron Exposures in Iron and Low Alloy Steels in Terms of Displacements Per Atom (DPA)

E704-19

Standard Test Method for Measuring Reaction Rates by Radioactivation of Uranium-238

E705-18

Standard Test Method for Measuring Reaction Rates by Radioactivation of Neptunium-237

E170-23

Standard Terminology Relating to Radiation Measurements and Dosimetry

E1005-21

Standard Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance

E944-19

Standard Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance

E854-19

Standard Test Method for Application and Analysis of Solid State Track Recorder (SSTR) Monitors for Reactor Surveillance

E181-23

Standard Guide for Detector Calibration and Analysis of Radionuclides in Radiation Metrology for Reactor Dosimetry

E262-17

Standard Test Method for Determining Thermal Neutron Reaction Rates and Thermal Neutron Fluence Rates by Radioactivation Techniques

E263-18

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Iron

E343-96

Standard Test Method for Measuring Reaction Rates by Analysis of Molybdenum-99 Radioactivity From Fission Dosimeters (Withdrawn 2002)