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  • ASTM
    E393-96 Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters
    Edition: 1996
    $103.58
    Unlimited Users per year

Description of ASTM-E393 1996

ASTM E393-96

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




ASTM E393

Scope

1.1 This test method describes two procedures for the measurement of reaction rates by determining the amount of the fission product Ba produced by the non-threshold reactions 235 U (n, f), 241 Am (n, f), and 239 Pu (n, f), and by the threshold reactions 238 U (n, f), 237 Np (n, f), and 232 Th (n, f).

1.2 These reactions produce many fission products, among which is 140 Ba, having a half-life of 12.752 days. 140 Ba emits gamma rays of several energies; however, these are not easily detected in the presence of other fission products. Competing activity from other fission products requires that a chemical separation be employed or that the Ba activity be determined indirectly by counting its daughter product La. This test method describes both procedure (a), the nondestructive determination of Ba by the direct counting of La several days after irradiation, and procedure (b), the chemical separation of Ba and the subsequent counting of Ba or its daughter 140 La.

1.3 With suitable techniques, fission neutron fluence rates can be measured in the range from 10 n (neutrons) [dot]cm -2 [dot]s -1 to approximately 10 15 n[dot]cm -2 [dot]s -1 .

1.4 The measurement of time-integrated reaction rates with fission dosimeters by Ba analysis is limited by the half-life of 140 Ba to irradiation times up to about six weeks.

1.5 The values stated in SI units are to be regarded as 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 and health practices and determine the applicability of regulatory limitations prior to use.


Keywords

Barium; Fast neutron flux/fluence; Neutron activation reactions; Radioactivation-fast neutron flux; Threshold detectors-1.6 MeV; Uranium-238 fission by-products; measuring reaction rates by analysis of barium-140 from fission; dosimeters


ICS Code

ICS Number Code n/a


DOI: 10.1520/E0393-96

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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