Occurrence of the 4n + 1 Series in Nature

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"A small quantity of a Np-237, the long-lived ancestor of the 4n + 1 series, has been isolated from a natural source. The Th-229 content of the Th-230 obtained from Belgian Congo pitchblende concentrate and of Th-232 obtained from Brazilian monazite has been determined indirectly through isolation of the Ac-225 daughter. The mass ratio of Np-237 to U-238 in the Belgian Congo pitchblende concentrate has been determined as (1.8 +/- 0.4) x 10-(-12). The mass ratio of U-233 to U-238 in the same ore deposit is found to be (1.3 +/- 0.2) x 10-(-13). The ratio of the respective neutron-capture ... continued below

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16 p. : ill., tables. ; 28 cm.

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Peppard, D. F.; Mason, G. W.; Gray, P. R. & Mech, J. F. April 10, 1952.

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"A small quantity of a Np-237, the long-lived ancestor of the 4n + 1 series, has been isolated from a natural source. The Th-229 content of the Th-230 obtained from Belgian Congo pitchblende concentrate and of Th-232 obtained from Brazilian monazite has been determined indirectly through isolation of the Ac-225 daughter. The mass ratio of Np-237 to U-238 in the Belgian Congo pitchblende concentrate has been determined as (1.8 +/- 0.4) x 10-(-12). The mass ratio of U-233 to U-238 in the same ore deposit is found to be (1.3 +/- 0.2) x 10-(-13). The ratio of the respective neutron-capture cross sections of U-238 in the ore body for the (n, 2n) and (n, gamma) reactions is calculated to be (1.3 +/- 0.6) x 10-(-3) on the basis of the relative Np-237 and Pu-239 contents."

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16 p. : ill., tables. ; 28 cm.

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Digitized from microopaque cards (1).

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  • April 10, 1952

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  • Feb. 12, 2018, 7:42 a.m.

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  • April 23, 2019, 7:32 p.m.

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Peppard, D. F.; Mason, G. W.; Gray, P. R. & Mech, J. F. Occurrence of the 4n + 1 Series in Nature, report, April 10, 1952; [Oak Ridge, Tennessee]. (https://digital.library.unt.edu/ark:/67531/metadc172698/: accessed July 28, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.