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Extension of Alpha- and Beta-Decay Systematics of ProtactiniumIsotopes
As part of the program for obtaining data to extend the scope of the systematics of alpha-radioactivity and to obtain more data pertaining to the energy surface in the heavy region of elements, they have made some pertinent new measurements on protactinium isotopes. The heaviest isotope of protactinium hitherto reported is that of mass 234 and hence it would be of interest to know the beta-emission properties of heavier isotopes in order to tie them in with the known radioactive data in this general region. Since low-energy deuteron bombardment of U{sup 238} might be expected to lead to Pa{sup 235} and Pa{sup 236} by (d,{alpha}n) and (d,{alpha}) reactions and proton bombardment to Pa{sup 235} by the (p,{alpha}) reaction, these irradiations were made in the 60-inch cyclotron at energies of 19 and 9.5 Mev, respectively. The protactinium was chemically separated following the bombardment of natural uranium by a procedure which involved a number of manganese dioxide cycles coupled with extractions of protactinium from aqueous into organic solvents. The manganese dioxide cycles consisted of precipitating this compound from the solution of uranium in nitric acid, followed by centrifugation, dissolution of the solid with hydroxylamine solution, dilution, and reprecipitation. The dissolved precipitate from …
Date:
January 30, 1950
Creator:
Meinke, W. Wayne & Seaborg, Glenn T.
System:
The UNT Digital Library
THE ISOTRON
Most methods of separating isotopes depend on the use of a large magnetic field. The isotron is an electromagnetic device for separating isotopes, but it effects the separation by the use of radiofrequency voltages instead of magnetic fields. It has the advantage that plane sources of large area can be used instead of the slit sources to which most magnetic methods are limited. Before entering into any discussion of the details, a simplified description of the principles of the method is given.
Date:
July 30, 1950
Creator:
Wilson, R.R.
System:
The UNT Digital Library
THE SEPARATION AND COLLECTION OF U-236 BY THE ELECTROMAGNETIC PROCESS
None
Date:
November 30, 1950
Creator:
Savage, H.W. & Wilkinson, P.E.
System:
The UNT Digital Library
REFINING OF MgX AND OTHER URANIUM-BEARING MATERIALS. Progress Report
None
Date:
November 30, 1950
Creator:
Ewing, R. A.; Belcher, R. L.; Kiehl, S. J. Jr. & Bearse, A. E.
System:
The UNT Digital Library
REFINING OF MgX AND OTHER URANIUM-BEARING MATERIALS. Progress Report for September 1950
None
Date:
September 30, 1950
Creator:
Ewing, R. A.; Belcher, R. L.; Kiehl, S. J. Jr. & Bearse, A. E.
System:
The UNT Digital Library
THE DISTRIBUTION OF TRACE URANIUM(VI) IN NITRIC ACID--TTA--ORGANIC SOLVENT MIXTURES
None
Date:
June 30, 1950
Creator:
Heisig, D.L. & Crandall, H.W.
System:
The UNT Digital Library
Pressure Drop in Tees
None
Date:
September 30, 1950
Creator:
Roarty, J. D.; Aykanian, A. A. & Lea, D. C.
System:
The UNT Digital Library
Solvent extraction of solutions containing rare earths. Preparation of thorium compounds from monazite by sulfuric acid decomposition and solvent extraction
An investigation was made of the feasibility of producing pure Th compounds from monazite sand by a process involving the digestion of the sand with H/sub 2/SO/sub 4/ and separation of Th from the rare earths by solvent extraction. Direct extraction was not practicable. Precipitation of the sulfate from the system with lime and HNO/sub 3/ was tried and found to be partially successful but impracticable because of the large losses of Th by occlusion in the precipitate. A successful method for producing tributylphosphate-extractable solution was found, consisting of neutralizing the original solution to precipitate the heavy metals as phosphates, and, after filtering and washing, dissolving this precipitate in HNO/sub 3/. (auth)
Date:
June 30, 1950
Creator:
Whatley, M. E. & Bridger, G. L.
System:
The UNT Digital Library