Ultrasensitive detection of radioactive cesium isotopes using a magneto-optical trap.

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We report the first magneto-optical trapping of mdioactive {sup 135}Cs and {sup 137}Cs and a promising means for detecting these isotopes to ullrasensilive lcvels by a system coupling the magneto-optical trap (MOT) to a mass separator. The mass separator efficiently delivers a 20 kV ion beam of either isotope into a quartzcube MOT cell having in one corner a small-diameter Zr foil, on which the ion beam is focused and into which the ions are implantetl. Inductive heating of thc foil releases {approx}45% of the implanted atoms into a MOT that uses large diameter beams and a dry-film coating to ... continued below

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11 p.

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Di Rosa, M. D. (Michael D.); Crane, S. G. (Scott G.); Kitten, J. J. (Jason J.); Taylor, W. A. (Wayne A.); Vieira, D. J. (David J.) & Zhao, X. (Xinxin) January 1, 2002.

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Description

We report the first magneto-optical trapping of mdioactive {sup 135}Cs and {sup 137}Cs and a promising means for detecting these isotopes to ullrasensilive lcvels by a system coupling the magneto-optical trap (MOT) to a mass separator. The mass separator efficiently delivers a 20 kV ion beam of either isotope into a quartzcube MOT cell having in one corner a small-diameter Zr foil, on which the ion beam is focused and into which the ions are implantetl. Inductive heating of thc foil releases {approx}45% of the implanted atoms into a MOT that uses large diameter beams and a dry-film coating to capture 3% of the released vapor. MOT fluorescence signals were found to increasc linearly with the number of foil-implanted atoms over a range of 10{sup 4} to 10{sup 7} in trapped-atom number. The measured slope of MOT signal versus number implanted was equal in the case each isotope to within 4%, signifying our ability to measure {sup 137}Cs/{sup 135}Cs ratios to within 4%. The isotopic selectivities of the mass separator and MOT combine to suppress interfering signal from {sup 133}Cs by a factor of greater than 5 x 10{sup 12} in the case of detecting {sup 135}Cs or {sup 137}Cs. Our present sample detection sensitivity is one million atoms.

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11 p.

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  • To appear in: Proceedings of the SPIE, Paper 4634-05, Jan. 18, 2002

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  • Report No.: LA-UR-02-0621
  • Report No.: LA-UR-02-621
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976067
  • Archival Resource Key: ark:/67531/metadc927753

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2002

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 1:42 p.m.

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Di Rosa, M. D. (Michael D.); Crane, S. G. (Scott G.); Kitten, J. J. (Jason J.); Taylor, W. A. (Wayne A.); Vieira, D. J. (David J.) & Zhao, X. (Xinxin). Ultrasensitive detection of radioactive cesium isotopes using a magneto-optical trap., article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc927753/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.