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ANS Student Conference 2025
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Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Kunihiko Tomiyasu, Kai Yokoyama, Kunihito Yamauchi, Masato Watanabe, Akitoshi Okino, Eiki Hotta
Fusion Science and Technology | Volume 56 | Number 2 | August 2009 | Pages 967-971
Plasma Engineering | Eighteenth Topical Meeting on the Technology of Fusion Energy (Part 2) | doi.org/10.13182/FST09-A9035
Articles are hosted by Taylor and Francis Online.
In order to evaluate the effect of cusp magnetic field in the cylindrical Radially Convergent Beam Fusion (RCBF) device, four kinds of experimental setups were examined. The maximum Neutron Production Rate (NPR) of 7.4 x 109 n/s was obtained at -80 kV and 15 A. As a result of the theoretical evaluation of fusion regimes in the RCBF device, the NPR normalized by the cathode current and the gas pressure was compared between the setups. The experimental data showed that the normalized NPR is highly correlated with the gas pressure, and it was independent of the setups. As the gas pressure decreased, the normalized NPR was increased. Hence, the present study suggests that the effect of the cusp magnetic field is to achieve lower pressure operation which improves the normalized NPR. The numerical estimation became in agreement with the experimental result by introducing an adjusting factor which was highly correlated with the pressure. The difference of the pressure is expected to affect some factors, such as an effective cathode transparency.
