ASTM-E393 2002

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E393-96(2002) Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters

Published By	Publication Date	Number of Pages
ASTM	2002	5

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Description

1.1 This test method describes two procedures for the measurement of reaction rates by determining the amount of the fission product ¹⁴⁰ 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 ¹⁴⁰ Ba activity be determined indirectly by counting its daughter product ¹⁴⁰ La. This test method describes both procedure ( a ), the nondestructive determination of ¹⁴⁰ Ba by the direct counting of ¹⁴⁰ La several days after irradiation, and procedure ( b ), the chemical separation of ¹⁴⁰ Ba and the subsequent counting of ¹⁴⁰ Ba or its daughter ¹⁴⁰ La.

1.3 With suitable techniques, fission neutron fluence rates can be measured in the range from 10 ⁷ n (neutrons) cm ² s ¹ to approximately 10 ¹⁵ n cm ² s ¹ .

1.4 The measurement of time-integrated reaction rates with fission dosimeters by ¹⁴⁰ 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.

Additional information

Standard Title	E393-96(2002) Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters
Published Code	ASTM
Publication Date	2002
Pages Count	5

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ASTM-E393 2002

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