CHEMICAL PROPERTIES OF BERKELIUM

Technical Report · Fri Feb 24 04:00:00 EST 1950

DOI:https://doi.org/10.2172/932812· OSTI ID:932812

Thompson, Stanley G; Seaborg, Glenn T

The recent production by Thompson, Ghiorso, and Seaborg of a radioactive isotope of berkelium (atomic number 97) makes it possible to investigate the chemical properties of this transuranium element by means of the tracer technique. This isotope has been prepared through the bombardment of Am{sup 241} with about 35 Mev helium ions in the 60-inch cyclotron of the Crocker Laboratory and is believed to have the mass number 243, or possibly 244. This Bk{sup 243} has a half-life of 4.6 hours and decays by electron capture with about 0.1% branching decay by alpha-particle emission. In the present tracer chemical experiments, the radiations accompanying the electron capture process were used as a means of detection and were counted in two ways. Where the sample deposits on the platinum plates were essentially weightless, as was the case following the evaporation and ignition of the elutriant solutions in the column adsorption experiments, a high efficiency was obtained by using a windowloess proportional counter to count the Auger electrons. The thicker samples from the precipitation experiments in which carrier materials were used were counted close to the thin window (3 mg/cm{sup 2} mica) of a bell type Geiger counter filled with 10 cm. xenon to enhance the efficiency for counting the x-rays. An aluminum absorber of thickness about 20 mg/cm{sup 2} was used between the sample and counter window to reduce errors due to variable absorption of soft components caused by small differences in sample thickness.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USAEC
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 932812
• Report Number(s): UCRL--607; AECD-2821
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ALUMINIUM
BERKELIUM
CHEMICAL PROPERTIES
CYCLOTRONS
DECAY
ELECTRON CAPTURE
HALF-LIFE
HELIUM IONS
MASS NUMBER
PLATINUM
PROPORTIONAL COUNTERS
SOFT COMPONENT
TRACER TECHNIQUES
TRANSURANIUM ELEMENTS
XENON