EXTRACTIVE DETERMINATION OF STRONTIUM-90 AND CERIUM-144 IN SAMPLES

Journal Article · Fri Mar 01 04:00:00 EST 1963 · At. Energ. (USSR)

OSTI ID:4727882

Rovinskii, F Ya; Ispravnikova, V V

The standard radiochemical methods used for the quantitative determination of Sr/sip 90/ and Ce/sup 144/ in soil, silt, and ash samples require 12 precipitation steps to separate these isotopes from the other radioactive materials. A method was developed to separate these elements from a mixture of long-lived isotopes that requires a much shorter time than any of the previously employed ones; it is based on the joint extraction of the Y/sup 90/ in equilibrium and of Ce/sup 141/(IV) from the solution obtained by dissolving the samples with 6N HNO/sub 3/, after removing the organic components by calcination at 400 un. Concent 85% C and adding up to 6M NH/sub 4/NO/sub 3/ to the solution. The extraction is carried out with tributylphosphate at a phase ratio of 1: 1 within less than 5 min. Sr/sup 90/, Cs/sup 137/, and Ru/sup 106/ are not coextracted with the Y and thus do not interfere with the analysis. The Pm/sup 147/ isotope is taken up in the TBP phase but its low-energy BETA -particles were not recorded on the counter used in the determination. The precision of the method is comparable to that of the usual radiochemical analysis although it requires only 2 1/2 hours. The Ce/sup 144/ can be determined subsequently in the same sample. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-021624
• OSTI ID: 4727882
• Journal Information: At. Energ. (USSR), Journal Name: At. Energ. (USSR) Vol. Vol: 14
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

AMMONIUM COMPOUNDS
BETA PARTICLES
BUTYL PHOSPHATES
CERIUM 144
CHEMISTRY
DECOMPOSITION
EFFICIENCY
ERRORS
ISOTOPE SEPARATION
NITRATES
NITRIC ACID
PROMETHIUM 147
QUANTITATIVE ANALYSIS
RADIOCHEMISTRY
RESIDUES
RUTHENIUM 106
SENSITIVITY
SOILS
SOLUTIONS
SOLVENT EXTRACTION
SPECTRA
STRONTIUM 90
YTTRIUM 90