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Standard Test Method for Measuring Neutron Fluence Rates by Radioactivation of Cobalt and Silver
STANDARD published on 1.6.2015
Designation standards: ASTM E481-15
Note: WITHDRAWN
Publication date standards: 1.6.2015
SKU: NS-610044
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
Keywords:
activation, cobalt, dosimetry, foil, silver, thermal neutron,, ICS Number Code 17.240 (Radiation measurements), 27.120.30 (Fissile materials and nuclear fuel technology)
Significance and Use | ||||||||||
3.1 This test method uses one monitor (cobalt) with a nearly 1/v absorption cross-section curve and a second monitor (silver) with a large resonance peak so that its resonance integral is large compared to the thermal cross section. The pertinent data for these two reactions are given in Table 1. The equations are based on the Westcott formalism (3.2 The advantages of this test method are the elimination of three difficulties associated with the use of cadmium: (3.3 The long half-lives of the two monitors permit the determination of fluence for long-term monitoring. |
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1. Scope | ||||||||||
1.1 This test method covers a suitable means of obtaining the thermal neutron fluence rate, or fluence, in well moderated nuclear reactor environments where the use of cadmium, as a thermal neutron shield as described in Test Method E262, is undesirable because of potential spectrum perturbations or of temperatures above the melting point of cadmium. 1.2 This test method describes a means of measuring a Westcott neutron fluence rate (Note 1) by activation of cobalt- and silver-foil monitors (See Terminology E170). The reaction 59Co(Note 1: Westcott fluence rate 1.3 The values stated in SI units are to be regarded as the standard. 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. |
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2. Referenced Documents | ||||||||||
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1.1.2014
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1.2.2009
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1.6.2009
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1.6.2009
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