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  • ASTM
    E343-96 Standard Test Method for Measuring Reaction Rates by Analysis of Molybdenum-99 Radioactivity From Fission Dosimeters (Withdrawn 2002)
    Edition: 1996
    $82.37
    Unlimited Users per year

Description of ASTM-E343 1996

ASTM E343-96

Withdrawn Standard: Standard Test Method for Measuring Reaction Rates by Analysis of Molybdenum-99 Radioactivity From Fission Dosimeters (Withdrawn 2002)




ASTM E343

Scope

1.1 This test method covers the measurement of reaction rates by determining the amount of the fission product 99 Mo produced by the non-threshold reactions 241 Am(n,f), 235 U(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 99 Mo, having a half-life of 65.94 h. Because of unresolved or interfering gamma rays when gamma-ray spectrometry is accomplished, the competing activity from other fission products requires that a chemical separation be employed to isolate the 99 Mo. 99 Mo emits gamma rays of several energies, which are easily detected and identified by a gamma-ray spectrometer.

1.3 With suitable techniques, neutron fluence rates can be measured in the range 10 to approximately 10 14 n[dot]cm [dot]s .

1.4 The measurement of time-integrated reaction rates with fission dosimeters by 99 Mo analysis is limited by the half-life of Mo to irradiation times up to about 300 h.

1.5 The values stated in SI units are to be regarded as the 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

Dosimetry; Fission by-products; reaction rates by analysis of molybdenum-99 radioactivity from fission; dosimeters, test,; Fast neutron flux/fluence; Neutron activation reactions; Radioactivation-fast neutron flux; Uranium-238 fission by-products; measuring reaction rates by analysis of molybdenum-99 radioactivity from; fission dosimeters, test,; Molybdenum-99 activity; fission of 233U, for measuring fast neutron flux,; Threshold detectors-740 to 780 keV; measuring reaction rates by analysisof molybdenum-99 radioactivity from; fission dosimeters, test,;Order Form


ICS Code

ICS Number Code 17.240 (Radiation measurements)


DOI: 10.1520/E0343-96

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