Studies on chemical effects on x-ray intensity ratios of K/sub. beta. //K/sub. cap alpha. / in nuclear decay of technetium nuclides /sup 99m/Tc, /sup 97m/Tc, and /sup 95m/Tc

Journal Article · Wed Jan 01 04:00:00 EST 1986 · J. Chem. Phys.; (United States)

OSTI ID:6213157

Yamoto, I; Kaji, H; Yoshihara, K

Chemical effects of characteristic x-ray intensity ratios of K/sub ..beta..//K/sub ..cap alpha../ were investigated for the second d-group element Tc in the decay processes /sup 99m/Tc ..-->.. /sup 99/Tc (two-step isomeric transition), /sup 97m/Tc ..-->.. /sup 97/Tc (one-step isomeric transition), and /sup 95m/Tc ..-->.. /sup 95/Mo (electron capture). The objective nuclides were produced by (n, ..gamma..)..beta../sup -/, (d, xn), and (..cap alpha.., xn) reactions and were chemically separated from the target materials. The x rays were measured with a pure germanium detector, and the K/sub ..beta../ x rays were analyzed into the two components K/sup prime//sub beta1/ and K/sup //sub beta2/ using a computer program. The chemical effect of the intensity ratio was more pronounced for K/sup prime//sub beta2//K/sub ..cap alpha../ than for K/sup //sub beta1//K/sub ..cap alpha../, as expected. The effect was larger in KTcO/sub 4/ than in the other species of Tc/sub 2/S/sub 7/, K/sub 2/TcCl/sub 6/, and Tc metal. The effect in the two-step isomeric transition in /sup 99m/Tc was found to be larger than in the one-step isomeric transition in /sup 97m/Tc. The effect in the electron capture in /sup 95m/Tc (Mo x rays) was similar to that in /sup 97m/Tc although the ratio K/sub ..beta..//K/sub ..cap alpha../ was smaller in /sup 95m/Tc than in /sup 97m/Tc, reflecting the change of nuclear charge. The tendency of the observed chemical effect was explained by taking into account the interfering factors which involve Pauling's ionicity in chemical bonding between Tc and its counter atom.

• Research Organization: Department of Chemistry, Faculty of Science, Tohoku University, Sendai 980, Japan
• OSTI ID: 6213157
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400700* -- Radiochemistry & Nuclear Chemistry
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHEMICAL STATE
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY-LEVEL TRANSITIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOMERIC TRANSITIONS
ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
SPECTRA
TECHNETIUM 95
TECHNETIUM 97
TECHNETIUM 99
TECHNETIUM ISOTOPES
X-RAY SPECTRA
YEARS LIVING RADIOISOTOPES