ASTM E264-08(2013)
用镍的放射性活化测量快中子反应速度的标准试验方法

Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Nickel

被代替

标准号

ASTM E264-08(2013)

发布

2008年

发布单位

美国材料与试验协会

替代标准

ASTM E264-19

当前最新

ASTM E264-19

 

 

引用标准

ASTM E1005 ASTM E1018 ASTM E170 ASTM E181 ASTM E261 ASTM E844 ASTM E944

适用范围

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 days³ and emits a gamma ray with an energy of 0.8107593-MeV.⁴

5.5 Competing activities ⁶⁵Ni(2.5172 h) and ⁵⁷Ni(35.60 h) are formed by the reactions ⁶⁴Ni(n,??) 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 environments^5,6 having thermal fluence rates of 38201;??8201;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.⁶

5.7 Fig. 2 shows a plot of cross section⁷ versus energy for the fast-neutron reaction ⁵⁸Ni(n,p) ⁵⁸Co. This figure is for illustrative purposes only to indicate the range of response of the ⁵⁸Ni(n,p) reaction. Refer to Guide E1018 for descriptions of recommended tabulated dosimetry cross sections.

FIG. 2 ⁵⁸Ni(n,p)⁵⁸Co Cross Section

Note 1???The data is taken from the Evaluated Nuclear Data File, ENDF/B-VI, rather than the later ENDF/B-VII. This is in accordance with E1018, section 6.1, since the later ENDF/B-VII data files do not include covariance information. For more details see Section H of reference 8.⁸

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