Nobel Prize in Physics in 1917 2026-10-18
Awarded to Charles Glover Barkla for characteristic X-rays of the chemical elements; he received it in 1918. The Barkla characteristic X-ray experiment describes the experimental separation of components.[ref]
The Nobel Prize in Physics 1917 by Nobel Prize Outreach. Official award record: Barkla, characteristic radiation and deferred receipt in 1918