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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
C. B. Bigham
Nuclear Science and Engineering | Volume 59 | Number 1 | January 1976 | Pages 50-52
Technical Note | doi.org/10.13182/NSE76-A26808
Articles are hosted by Taylor and Francis Online.
The fission cross sections for 233U, 235U, 239Pu, and 241Pu reported in 1958 have been revised using the very precise, recently published, specific activities 21 405 ± 20 dpm/µg 233U, 4798.1 ± 3.3 dpm/mg 235U, and 746.19 ± 0.41 dpm/mg 238U. Revised ratios of fission cross sections at 2200 m/sec are: 233U/235U = 0.9142 ± 0.0012, 239Pu/235U = 1.2876 ± 0.0034, 239Pu/ 233U = 1.4084 ± 0.0036, and 241Pu/239Pu = 1.3506 ± 0.007. Revised fission cross sections at 200 m/sec in barns relative to σc(197 Au) = 98.7 ± 0.2 are: σf(233 U) = 527.4 ± 3.1 σf(235 U) = 576.9 ± 3.4, σf(239 Pu) = 742.8 ± 4.4, and σf(241 Pu) = 1003.3 ± 5.2. The errors do not include g-factor errors of ±0.2% for 233U, ±0.155% for 235U, ±0.285% for 239Pu, and ±0.7% for 241Pu.
