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ASTM E 393 Document Information:
Title
Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 from Fission Dosimeters
ASTM International
Publication Date:
Jan 10, 1996
Scope:
This 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).
These reactions produce many fission products, among which is140Ba,
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 of140La several days
after irradiation, and procedure
(b), the chemical separation of 140Ba and the subsequent counting of
140Ba or its daughter 140La.
With suitable techniques, fission neutron fluence rates can be
measured in the range from 10 7
n (neutrons) · cm−2· s−1 to
approximately 1015 n ·
cm−2 · s−1.
The 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.
The values stated in SI units are to be regarded as standard.
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-140
- fission dosimeter
- fission product
- fission reaction rates
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