Aktivierungsanalytische Bestimmung von Thallium in gesteinen

Abstract

In a series of rock samples—including some USGS standard rocks—thallium was determined by thermal neutron activation analysis. After complete radiochemical purification the radioactivity of the samples was measured with conventional methane flow counters using the 97.9% β-decay and by evaluating the Hg-X-rays from 2.1% electron capture of²⁰⁴T (T=3.8y). Whith a Ge(Li) detector concentrations of 1 ppb (after 3 days irradiation at a thermal neutron flux of 6·10¹³ n·cm⁻²·sec⁻¹) could be detected after a very simple radiochemical procedure based on ion exchange.