Occurrence of the 4n + 1 Series in Nature
Description:
"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 oreā¦
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Date:
April 10, 1952
Creator:
Peppard, D. F.; Mason, G. W.; Gray, P. R. & Mech, J. F.
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Partner:
UNT Libraries Government Documents Department