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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Production of the Alpha-Particle Emitting Radionuclide Astatine-211 at the Texas A&M Cyclotron Institute

Bhakta, Viharkumar Satish 2011 August 1900 (has links)
The need of a stable production of At-211 is necessary to continue research in alpha-particle targeted radionuclide therapy. Our objectives were to establish the production of Astatine-211 at Texas A&M Cyclotron Institute, optimize the production methods to reduce the generation of contaminants and maximize At-211 production, and assess the radiological safety aspects of At-211 production. The production of the alpha-particle emitting radionuclide At-211 was performed at the Texas A&M Cyclotron Institute using the K500 superconducting cyclotron following the production reaction Bi-209(α, 2n)At-211 using a thick bismuth target of 500 μm. We carried out two irradiation experiments where the initial energy of the alpha-particle beam, 80 MeV, was degraded using multiple copper and aluminum foils to 27.8 and 25.3 MeV, respectively. The end of beam time was 4 hours for both experiments. The resulting At-211 yields were 36.0 and 12.4 MBq/μA-h, respectively. Several impurities were produced using the 27.8 MeV, which included At-210 and Po-210. However, when the 25.3 MeV beam was used, the impurities At-210 and Po-210 were resolved and other contaminants were minimized to less than 0.8% of At-211 yield. The production yields were in accordance to previous published results. From the success of these initial experiments, additional steps were taken to produce At-211 in excess quantities for distillation purposes. In order to obtain viable quantities of At-211, the gross yield needed to be increased due to losses that are incurred during distillation and radioactive decay. The ability to produce high yields of this isotope required a redesign of the target and use of the K150 cyclotron using a higher beam intensity.
2

Secao de choque do Li-6, litio natural e Bi-209 para a reacao (gama,n) junto ao limiar

CESAR, MARILIA T.F. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:24:38Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:22Z (GMT). No. of bitstreams: 1 00612.pdf: 2818600 bytes, checksum: 098a1a1a73abbe709a34812993e9cb03 (MD5) / Dissertacao (Mestrado) / IEA/D / Escola Politecnica, Universidade de Sao Paulo - POLI/USP
3

Secao de choque do Li-6, litio natural e Bi-209 para a reacao (gama,n) junto ao limiar

CESAR, MARILIA T.F. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:24:38Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:22Z (GMT). No. of bitstreams: 1 00612.pdf: 2818600 bytes, checksum: 098a1a1a73abbe709a34812993e9cb03 (MD5) / Dissertacao (Mestrado) / IEA/D / Escola Politecnica, Universidade de Sao Paulo - POLI/USP

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