Abstract
Measurements of the tritium beta end-point energy in tritium-implanted Si(Li) detectors are discussed in the light of current interest in the 3H 3He atomic mass difference. The role of radiation damage is crucial in assessing such measurements. The discussion is illustrated by a new measurement of the end-point energy in an implanted Si(Li) detector, giving a value 18594 eV with a statistical error of ±4 eV and an estimated systematic uncertainty of ±25 eV.
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