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ASTM E262

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

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Organization: ASTM
Publication Date: 10 February 2003
Status: inactive
Page Count: 9
ICS Code (Fissile materials and nuclear fuel technology): 27.120.30
ICS Code (Radiation measurements): 17.240
scope:

The purpose of this method is to define a general procedure for determining an unknown thermal neutron-fluence rate by neutron activation techniques. It is not practicable to describe completely a technique applicable to the large number of experimental situations that require the measurement of a thermal-neutron fluence rate. Therefore, this method is presented so that the user may adapt to his particular situation the fundamental procedures of the following techniques.

Absolute counting technique using pure cobalt, pure gold, or cobalt-aluminum or gold-aluminum alloy.

Standard foil technique using pure gold, or gold-aluminum alloy, and

Secondary standard foil techniques using pure indium, indium-aluminum alloy, and dysprosium-aluminum alloy.

The techniques presented are limited to measurements at room temperatures. However, special problems when making thermal-neutron fluence rate measurements in high-temperature environments are discussed in 8.2. For those circumstances where the use of cadmium as a thermal shield is undesirable because of potential spectrum perturbations or of temperatures above the melting point of cadmium, the method described in Test Method E 481 can be used in some cases. Alternatively, gadolinium filters may be used instead of cadmium. For high temperature applications in which aluminum alloys are unsuitable, other alloys such as cobalt-nickel or cobalt-vanadium have been used.

Table 1 indicates the useful neutron-fluence ranges for each detector material.

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.

Document History

August 1, 2017
Standard Test Method for Determining Thermal Neutron Reaction Rates and Thermal Neutron Fluence Rates by Radioactivation Techniques
The purpose of this test method is to define a general procedure for determining an unknown thermal-neutron fluence rate by neutron activation techniques. It is not practicable to describe completely...
January 1, 2013
Standard Test Method for Determining Thermal Neutron Reaction Rates and Thermal Neutron Fluence Rates by Radioactivation Techniques
The purpose of this test method is to define a general procedure for determining an unknown thermal-neutron fluence rate by neutron activation techniques. It is not practicable to describe completely...
November 1, 2008
Standard Test Method for Determining Thermal Neutron Reaction Rates and Thermal Neutron Fluence Rates by Radioactivation Techniques
The purpose of this test method is to define a general procedure for determining an unknown thermal-neutron fluence rate by neutron activation techniques. It is not practicable to describe completely...
ASTM E262
February 10, 2003
Standard Test Method for Determining Thermal Neutron Reaction and Fluence Rates by Radioactivation Techniques
The purpose of this method is to define a general procedure for determining an unknown thermal neutron-fluence rate by neutron activation techniques. It is not practicable to describe completely a...
June 10, 1997
Standard Test Method for Determining Thermal Neutron Reaction and Fluence Rates by Radioactivation Techniques
1. Scope 1.1 The purpose of this method is to define a general procedure for determining an unknown thermal neutron-fluence rate by neutron activation techniques. It is not practicable to describe...
September 19, 1986
Standard Test Method for Determining Thermal Neutron Reaction and Fluence Rates by Radioactivation Techniques
A description is not available for this item.
May 31, 1985
STANDARD METHOD FOR DETERMINING THERMAL NEUTRON REACTION AND FLUENCE RATES BY RADIOACTIVATION TECHNIQUES
A description is not available for this item.
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