The chemical separation of the nuclear isomers of127Te and129Te in different media has been studied. The variation offj(127Te) withpH in aqueous solutions of HCl, HNO3, HClO4, and NaOH has been measured;fjis the probability that, if the parent metastablehyphen;state activity is in the telluric acid form, the daughter groundhyphen;state activity will be found as tellurous acid as a result of chemical interactions in a medium of substancej.Thefj's for the different acids behave very similarly as thepH changes. In 6Nacid solutions,fjis close to unity; it decreases monotonically with increasingpH and approaches the value for H2O, atpH of 6.0, of 0.760plusmn;0.017. In NaOH,fjincreases with decreasingpH, and also approaches the value for H2O. The variation offjwithpH may be expressed by the relation,fjequals;explpar;xjrpar;sol;lsqb;1plus;explpar;xjrpar;rsqb;, withxjequals;mjlpar;pHrpar;plus;bj;mjandbjare parameters which are obtained from the data. Also, relativefjvalues for127Te and129Te have been determined in solid telluric acid, H2O, and 6Nsolutions of HCl, HClO4, and NaOH. Although the absolutefjvalues for these nuclides change from substance to substance, the ratios of thefj's remain fairly constant, approximately equal to unity. Thus,fjappears to be mainly a function of the chemical, and not the nuclear, properties of the isomer separation process.
展开▼
