| Clue | Source | Date |
|---|---|---|
| X-ray unit | The Times Sunday Concise | 14 Jul 2024 |
| Wilhelm -, German physicist who discovered X-rays (7) | ||
| Ron meets rough gent in the X-ray unit | The Telegraph Cryptic | 18 May 2015 |
| X-ray discoverer | ||
| Versatile Dutch musician: 1885–1932 | ||
| Winner of first Nobel prize in physics, 1901. | ||
| X-ray man. | ||
| Famous physicist. | ||
| Discoverer of X-rays. |