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Title: CHEMICAL PROPERTIES OF BERKELIUM

CHEMICAL PROPERTIES OF BERKELIUM 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 more » 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. « less
Authors: ;
Publication Date:
OSTI Identifier:OSTI ID: 932812
Report Number(s):UCRL--607; AECD-2821
TRN: US200814%%764
DOE Contract Number:DE-AC02-05CH11231
Resource Type:Technical Report
Research Org:Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org:USAEC
Country of Publication:United States
Language:English
Subject: 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