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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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Prepare for the 2025 Nuclear PE Exam with ANS guides
The next opportunity to earn professional engineer (PE) licensure in nuclear engineering is this fall, and now is the time to sign up and begin studying with the help of materials like the online module program offered by the American Nuclear Society.
K. F. Flynn, L. E. Glendenin, E. P. Steinberg
Nuclear Science and Engineering | Volume 22 | Number 4 | August 1965 | Pages 416-419
Technical Paper | doi.org/10.13182/NSE65-A20627
Articles are hosted by Taylor and Francis Online.
Half-lives have been measured by direct decay for 18 radionuclides. The method of least squares was used to obtain the best straight-line fit to the data. The observed half-lives are 87.9 ± 0.3 d for S35, 52.7 ± 0.5 d for Sr89, 13.6 ± 0.3 y for Nb93m, 35.8 ± 0.5 d for Nb95, 65.5 ± 0.2 d for Zr95, 39.5 ± 0.3 d for Ru103, 368.0 ± 1.8 d for Ru106, 13.6 ± 0.2 y for Cd113, 76.3 ± 6.6 y for Sn121, 2.71 ± 0.02 y for Sb125, 1.99 ± 0.02 y for Cs134, 283.8 ± 0.6 d for Ce144, 2.60 ± 0.02 y for Pm147, 87 ± 9 y for Sm151, 134.2 ± 0.8 d for Tm170, 700± 5 d for Tm171, 3.68 ± 0.05 y for Tl204, and 164.4 ± 0.4 d for Cm242. These data are compared with current literature values, and average values of the existing determinations are given.
