| 21. | All of the non-radioactive lanthanides were detected in the stream, with the exception of thulium and lutetium.
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| 22. | Thulium is the second least abundant of the lanthanides after promethium, which is only found in trace quantities on Earth.
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| 23. | The primary decay products before 174 Yb are isotopes of thulium, and the primary products after are isotopes of lutetium.
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| 24. | Cleve named the oxide thulia and its element thulium after Thule, an Ancient Greek place name associated with Scandinavia or Iceland.
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| 25. | With producer J . Hall, Thulium recorded their second album, " The Secret Club ", in two weeks.
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| 26. | In 1879, Swedish chemist Per Teodor Cleve separated in the rare earth thulia : these were the oxides of holmium and thulium respectively.
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| 27. | The primary decay products before are element 67 ( holmium ) isotopes, and the primary products after are element 69 ( thulium ) isotopes.
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| 28. | Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices and in solid-state lasers.
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| 29. | High-purity thulium oxide was first offered commercially in the late 1950s, as a result of the adoption of ion-exchange separation technology.
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| 30. | Thulium doped fibre amplifiers have been used in the S-band ( 1450 1490 nm ) and Praseodymium doped amplifiers in the 1300 nm region.
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