HETEROGENEITY OF FUSION WELDS DETERMINED BY USE OF $sup 63$Ni-TAGGED FILLER METAL. Page: 3 of 35
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Table I. Pure Beta-Emitting Isotopes and Their Energies
Maximum Maximum Maximum
Isotope Energy Isotope Energy Isotope Energy
(MeV) (MeV) (MeV)
90Y 2.28 36C1 0.71 33P 0.25
97Zra 1.90 127Te 0.70 147Pm 0.22
32P 1.71 11amCd 0.58 66Nia 0.20
91Y 1.54 39Ar 0.56 35S 0.167
31Si 1.48 19Be 0.55 14C 0.156
89Sr 1.46 90Sra 0.54 151Sm 0.076
210Bia 1.17 18sW 0.43 GENi 0.067
1'09Pda 1.02 121Sn 0.38 228Raa 0.05
143Pr 0.93 188Wa --.35 227Aca 0.045
69Zn 0.90 99Tc 0.29 106Rua 0.039
204T1 0.76 45Ca 0.26 3H 0.018
to daughter product(s) having other radiations that must be
Table II. Characteristics of Selected Radioactive Tracers.
All are pure beta emitters
Isotope Energy Half-Life in
63Ni 0.067 92 yr Matrix
4C 0.156 5.7 x 103 yr Selective
35s 0.167 88 d Selective
33P 0.25 25 d Selective
MATERIALS AND PROCEDURES
Fabrication of Isotope-Traced Filler Metal Wires
For exploring the structure and alloying in heterogeneous welds, 63Ni-
tagged, 1/16-in.-diam wire was prepared in type 347 stainless steel, type
308 stainless steel, and Inconel 82 filler metals. Also procedures were
developed for preparing 1/16- and 5/32-in.-diam wires of type 347 stainless
steel filler metal tagged with 14C. These wires contained low and high
concentrations of carbon, sulfur, and phosphorus for studying the effects
of segregates on weld properties. Work in this area is now progressing.
Isotope 63Ni was obtained locally as an aqueous 1 M HC1 solution with
a specific activity exceeding 5-C!/g Ni and a radiochemical purity exceeding.
95%, with about 0.1% "5Ni.
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Hammond, J.P.; Slaughter, G.M. & Gurtner, F.B. HETEROGENEITY OF FUSION WELDS DETERMINED BY USE OF $sup 63$Ni-TAGGED FILLER METAL., report, October 31, 1972; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1035220/m1/3/: accessed October 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.