In:
Radiochimica Acta, Walter de Gruyter GmbH, Vol. 98, No. 6 ( 2010-6-1), p. 321-326
Abstract:
In order to study the gas-phase chemical behavior of transactinides, an on-line isothermal chromatography apparatus has been developed and applied to separate short-lived technetium isotopes in the form of TcO 3 from fission products. The fission products from a 252 Cf source were continuously and rapidly transported through the capillary to the isothermal chromatography apparatus using the N 2 /KBr gas-jet techniques. Volatile oxide molecules were formed at the reaction zone kept at 900 °C since a trace amount of oxygen existed in the N 2 carrier gas. With the new developed isothermal chromatography apparatus, a selective separation of Tc from fission products was achieved. After isothermal chromatographic separation, 101,103,104,105,106,107,108 Tc were dominantly observed together with their Ru daughters in the γ-spectrum, The chemical yields of 101 Tc, 104 Tc and 105 Tc isotopes with longer half-lives are about 55−57%, and those of 103 Tc, 106 Tc, 107 Tc and 108 Tc isotopes with shorter half-lives dropped down to 25−28%. The adsorption enthalpy of the investigated compounds on quartz surfaces was determined to be −150±5 kJ/mol by fitting the measured retention curves with a Monte Carlo model. The observed species of technetium oxide is attributed to TcO 3 , which is in good agreement with previous experimental results. That means our system worked properly and it can be used to investigate the gas-phase chemical behavior of transactinides.
Type of Medium:
Online Resource
ISSN:
2193-3405
,
0033-8230
DOI:
10.1524/ract.2010.1724
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2010
Permalink