Identification of short-lived ruthenium and rhodium isotopes in fission by rapid chemical separations

doi:10.1016/0022-1902(78)80486-2

Journal of Inorganic and Nuclear Chemistry

Volume 40, Issue 6, 1978, Pages 945-955

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Abstract

Short-lived ruthenium and rhodium isotopes were produced via thermal neutron induced fission of ²³⁵U, ²³⁹Pu and ²⁴⁹Cf and via fast neutron induced fission of ²³⁸U. The ruthenium isotopes and their descendants were isolated from the fission product mixtures by means of a rapid chemical separation procedure. Typically 7.6 sec were required from the end of irradiation to the start of counting. The γ-ray singles spectra as well as the γ-γ-coincidences were recorded with Ge(Li)-detectors. New short-lived nuclides were identified on the basis of their decay characteristics, and existing data of the longer lived isotopes were confirmed. Results are presented for the ruthenium isotopes 3.75 min ¹⁰⁷Ru, 4.55 min ¹⁰⁸Ru, 34.5 sec ¹⁰⁹Ru, 12.9 sec ¹⁰⁹Ru (isomer), 12.6 sec ¹¹⁰Ru, 3 sec ¹¹¹Ru, 3.6 sec ¹¹²Ru, 3 sec ¹¹³Ru, and the rhodium isotopes 17 sec ¹⁰⁸Rh, 79.8 sec ¹⁰⁹Rh, 3.3 sec ¹¹⁰Rh, 11 sec ¹¹¹Rh.

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^†: Present address: Gesellschaft für Schwerionenforschung, GSI, D-6100 Darmstadt, Fed. Rep. of Germany.

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Identification of short-lived ruthenium and rhodium isotopes in fission by rapid chemical separations

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Inorg. Nucl. Chem. Lett.

Nucl. Instr. Meth.

Nucl. Phys.

Z. Physik

Phys. Rev.

Transitional Nuclei Progress Report

Phys. Rev.

Radiochim. Acta

Phys. Rev.

Phys. Rev.

Phys. Rev.

Doctoral Thesis

Univ. of California Lawrence Radiation Lab. Report UCRL 18978