Abstract
Electron capture in Tl 204 was studied by observing X-rays emitted by the daughter nucleus Hg 204. Two similar NaI scintillation detectors were used, each of geometrical efficiency close to 50%. From measurements of coincidences between K and L X-rays, the L/K capture ratio was determined to be 0.60±0.055, substantially higher than previously reported values. The K capture/β − ratio was deduced from absolute counting of K X-rays and β-particles; the value obtained was 0.0159±0.00036. From this value, and that obtained for the L/K ratio, the electron capture branching ratio was determined to be 0.0254±0.0012, again significantly higher than previous values.
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