Monsanto Chemical Company, Unit 3 abstracts of progress reports, August 16--31, 1945: Summary of work to date on volatile neutron source

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It was proposed to prepare a volatile polonium compound which could be used alone or with another gaseous compound as a neutron source. The objective was to obtain a neutron source which would give off few neutrons in the expanded state, but when condensed would act substantially as a thick target and emit perhaps ten times as many neutrons. Originally, polonium hexafluoride was suggested; with such compound the fluorine atoms would constitute the target. the predicted boiling point of polonium hexafluoride is about -40 {degrees}C. There was reason to believe, however, that lower relatively non-volatile fluorides would be formed rather ... continued below

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Rollinson, C.L. September 6, 1945.

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Description

It was proposed to prepare a volatile polonium compound which could be used alone or with another gaseous compound as a neutron source. The objective was to obtain a neutron source which would give off few neutrons in the expanded state, but when condensed would act substantially as a thick target and emit perhaps ten times as many neutrons. Originally, polonium hexafluoride was suggested; with such compound the fluorine atoms would constitute the target. the predicted boiling point of polonium hexafluoride is about -40 {degrees}C. There was reason to believe, however, that lower relatively non-volatile fluorides would be formed rather than the hexafluoride. Polonium alkyls were therefore proposed as alternatives. The predicted boiling point of Po(CH{sub 3}){sub 2} is about 110 {degrees}C. This compound in itself would probably not be suitable as a target material but it could be mixed with other gases such as carbon tetrafluoride, boron trifluoride, etc., as targets. As a longer range possibility, Po(CF{sub 3}){sub 2} was also suggested. This compound would act as its own target and would moreover have the same F/Po ratio as PoF{sub 6}; its boiling point could be expected to be 30{degrees} - 60 {degrees} lower than that of polonium dimethyl. Calculations were made with showed that the desired effect could be obtained either with Po F{sub 6} or with a mixture of Po(CH{sub 3}){sub 2} with a suitable target gas. Investigation of the preparation of these two compounds was therefore undertaken, and later some preliminary attempts to prepare polonium carbonyl were made.

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10 p.

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OSTI as DE97003049

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  • Other Information: DN: Declassified

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  • Other: DE97003049
  • Report No.: MLM--1064
  • Grant Number: AC04-76DP00053
  • Office of Scientific & Technical Information Report Number: 443206
  • Archival Resource Key: ark:/67531/metadc677694

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  • September 6, 1945

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 24, 2015, 4:38 p.m.

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Rollinson, C.L. Monsanto Chemical Company, Unit 3 abstracts of progress reports, August 16--31, 1945: Summary of work to date on volatile neutron source, report, September 6, 1945; United States. (digital.library.unt.edu/ark:/67531/metadc677694/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.