ASTM E 393 : 2013 : REDLINE
Current
The latest, up-to-date edition.
Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters
English
01-06-2013
CONTAINED IN VOL. 12.02, 2015 Specifies 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).
Committee |
E 10
|
DocumentType |
Redline
|
Pages |
7
|
PublisherName |
American Society for Testing and Materials
|
Status |
Current
|
1.1This test method describes two procedures for the measurement of reaction rates by determining the amount of the fission product 140Ba produced by the non-threshold reactions 235U(n,f), 241Am(n,f), and 239Pu(n,f), and by the threshold reactions 238U(n,f), 237Np(n,f), and 232Th(n,f).
1.2These reactions produce many fission products, among which is 140Ba, having a half-life of 12.752 days. 140Ba 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 140Ba activity be determined indirectly by counting its daughter product 140La. This test method describes both procedure (a), the nondestructive determination of 140Ba by the direct counting of 140La several days after irradiation, and procedure (b), the chemical separation of 140Ba and the subsequent counting of 140Ba or its daughter 140 La.
1.3With suitable techniques, fission neutron fluence rates can be measured in the range from 107 n (neutrons) · cm−2 · s−1 to approximately 1015 n · cm−2 · s−1.
1.4The measurement of time-integrated reaction rates with fission dosimeters by 140Ba analysis is limited by the half-life of 140Ba to irradiation times up to about six weeks.
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