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A small Li6Eu(BO3)3 crystal (2.72g) was measured deep underground at the Gran Sasso National Laboratories with a HP Ge detector of 408cm3 during 1500h. While the crystal is not polluted by usual radioactive contaminants (only limits on the activity of U/Th chains, 40 K, 60 Co, 137 Cs were set on the level of 0.01–1Bq/kg), the presence of radioactive 152 Eu and 154...
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