IYPT 2019 Elements 069: Thulium: Portable X-rays and banknotes

Element 69 in our International Year of the Periodic Table series is thulium. A rare element, thulium is used in portable X-ray machines and also in some banknotes. Thulium is, after promethium, the second-least abundant of the lanthanide elements. As a consequence, it’s more valuable than better known precious metals such as platinum and gold. […]

https://www.compoundchem.com/2019/09/17/iypt069-thulium/

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