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ASTM E264-08(2013)
Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel
Automaticky přeložený název:
Standardní zkušební metoda pro měření Fast-neutronů reakční rychlosti by Radioactivation niklu
NORMA vydána dne 1.1.2013
Informace o normě:
Označení normy: ASTM E264-08(2013)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.1.2013
Kód zboží: NS-45786
Počet stran: 3
Přibližná hmotnost: 9 g (0.02 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM E264-08(2013) :
Keywords:
activation, activation reaction, cross section, dosimetry, fast-neutron monitor, neutron metrology, nickel, pressure vessel surveillance, reaction rate, ICS Number Code 17.240 (Radiation measurements), 27.120.30 (Fissile materials and nuclear fuel technology)
Doplňující informace
| Significance and Use | ||||||||||||||
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5.1 Refer to Guide E844 for the selection, irradiation, and quality control of neutron dosimeters. 5.2 Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence rate with threshold detectors. 5.3 Pure nickel in the form of foil or wire is readily available, and easily handled. 5.4 58Co has a half-life of 70.86 days5.5 Competing activities 65Ni(2.5172 h) and 57Ni(35.60 h) are formed by the reactions 64Ni(n,γ) 65Ni, and 58Ni(n,2n)57Ni, respectively. 5.6 A second 9.04 h isomer, 58mCo, is formed that decays to 70.86-day 58Co. Loss of 58Co and 58mCo by thermal-neutron burnout will occur in environments5,6 having thermal fluence rates of 3 × 1012 cm−2·s −1 and above. Burnout correction factors, R, are plotted as a function of time for several thermal fluxes in Fig. 1. Tabulated values for a continuous irradiation time are provided in Hogg, et al.5.7 Fig. 2 shows a plot of cross section1.1 This test method covers procedures for measuring reaction rates by the activation reaction 58Ni(n,p)58Co. 1.2 This activation reaction is
useful for measuring neutrons with energies above approximately 2.1
MeV and for irradiation times up to about 200 days in the absence
of high thermal neutron fluence rates (for longer irradiations, see
Practice E261).
1.3 With suitable techniques fission-neutron fluence rates densities above 107 cm−2·s −1 can be determined. 1.4 Detailed procedures for other fast-neutron detectors are referenced in Practice E261. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. |
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