The New Element Berkelium (Atomic Number 97) (open access)

The New Element Berkelium (Atomic Number 97)

An isotope of the element with atomic number 97 has been discovered as a product of the helium-ion bombardment of americium. This isotope decays with the emission of alpha-particles of maximum energy 6.72 Mev (30 percent) and it emits lower energy alpha-particles of energies 6.55 Mev (53 percent) and 6.20 Mev (17 percent). The half-life of this isotope is 4.6 hours and it decays primarily by electron capture with about 0.1 percent branching decay by alpha-particle emission. The mass number is probably 243 as indicated by chemical separation of the alpha-particle and electron-capture daughters. The name berkelium, symbol Bk, is proposed for element 97. The chemical separation of element 97 from the target material and other reaction products was made by combinations of precipitation and ion exchange adsorption methods making use of its anticipated (III) and (IV) oxidation states and its position as a member of the actinide transition series. The distinctive chemical properties made use of in its separation and the equally distinctive decay properties of the particular isotope constitute the principal evidence for the new element.
Date: April 26, 1950
Creator: Thompson, S. G.; Ghiorso, A. & Seaborg, G. T.
Object Type: Report
System: The UNT Digital Library
Texas Attorney General Opinion: V-1046 (open access)

Texas Attorney General Opinion: V-1046

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Price Daniel, regarding a legal question submitted for clarification: The legality of a bank's maintaining deposit facilities in a garage building attached to a bank building by a tunnel below the street.
Date: April 26, 1950
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
The New Element Berkelium (Atomic Number 97) (open access)

The New Element Berkelium (Atomic Number 97)

None
Date: April 26, 1950
Creator: Thompson, S. G.; Ghiorso, A. & Seaborg, G. T.
Object Type: Report
System: The UNT Digital Library
Separation of Ruthenium From Uranium Hexafluoride (open access)

Separation of Ruthenium From Uranium Hexafluoride

None
Date: April 26, 1950
Creator: Gustison, R. A.; Kirslis, S. S.; McMillan, T. S. & Bernhardt, H. A.
Object Type: Report
System: The UNT Digital Library
Present Status of the Bevatron R. F. System (open access)

Present Status of the Bevatron R. F. System

The general method of controlling the radio frequency for the full scale Bevatron will be the same as that used on the 1/4 scale machine. The details of course will be modified to meet the requirements of greater range, higher output voltage and closer tracking tolerances. In addition, there is the added complication introduced by the current ripple.
Date: April 26, 1950
Creator: Riedel, J.
Object Type: Report
System: The UNT Digital Library